About Scientific Calculator fx-991
Scientific Calculator fx-991 - The Ultimate Math & Science Tool! Struggling with math problems, equations, or integrals? Need a powerful scientific calculator to solve step-by-step? With Scientific Calculator fx-991, you...
Scientific Calculator fx-991 - The Ultimate Math & Science Tool! Struggling with math problems, equations, or integrals? Need a powerful scientific calculator to solve step-by-step? With Scientific Calculator fx-991, you can calculate, graph, and find formulas instantly - making learning math, physics, and chemistry easier than ever! Key Features + Step-by-step equation solver - Enter any equation and get a detailed step-by-step solution. + Advanced scientific functions - Solve fractions, algebra, derivatives, integrals, trigonometry, and more. + Graphing mode - Visualize mathematical functions interactively. + Extensive formula library - Access key formulas for math, physics, and chemistry in seconds. + Unit converter - Quickly convert between different measurement units. + Casio fx-991 inspired interface - A familiar and intuitive experience for students. Perfect for high school and college students, engineers, and professionals in STEM fields! Who is this app for? High school students - Solve algebra, calculus, and physics problems efficiently. College & university students - Master engineering, physics, and complex math subjects. STEM professionals - Perform advanced calculations quickly and accurately. Download Scientific Calculator fx-991 now and simplify your calculations! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
Version History * Added one-variable polynomial division with quotient and remainder results. * Improved the formula reference interface. * Added the periodic table of chemical elements. * Added the ability to save and manage favorite formulas. * Improved performance and fixed minor bugs. 1.9.2 Sep 19 ∙ Updated the formula interface and added the periodic table of elements. ∙ Added lists of favorite and recently viewed formulas. ∙ Improved calculation history for faster viewing and access to results. 1.9.1 Sep 7 ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point. ◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities. ∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises. ∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results • Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization: ∙ We have added more physics and math formulas. ∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience + Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results. + Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly). + Enhanced calculation and analysis speed for certain equations and inequalities. + Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations. • Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations. • Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new. Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new. Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities. +Linear inequalities, quadratic inequalities. +Irrational inequalities (with square roots). +Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities. +Linear inequalities, quadratic inequalities. +Irrational inequalities (with square roots). +Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025
Previous Versions
Here you can find the changelog of Scientific Calculator fx-991 since it was posted on our website on 2023-07-07 19:11:34.
The latest version is 1.9.2 and it was updated on 2026-10-14 09:55:43. See below the changes in each version.
Scientific Calculator fx-991 version 1.9.2
Updated At: 2026-10-14
Changes: Version History * Added one-variable polynomial division with quotient and remainder results.
* Improved the formula reference interface.
* Added the periodic table of chemical elements.
* Added the ability to save and manage favorite formulas.
* Improved performance and fixed minor bugs. 1.9.2 Sep 19 ∙ Updated the formula interface and added the periodic table of elements.
∙ Added lists of favorite and recently viewed formulas.
∙ Improved calculation history for faster viewing and access to results. 1.9.1 Sep 7 ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025
Scientific Calculator fx-991 version 1.9.2
Updated At: 2026-09-26
Changes: Version History * Added one-variable polynomial division with quotient and remainder results.
* Improved the formula reference interface.
* Added the periodic table of chemical elements.
* Added the ability to save and manage favorite formulas.
* Improved performance and fixed minor bugs. 1.9.2 6d ago ∙ Updated the formula interface and added the periodic table of elements.
∙ Added lists of favorite and recently viewed formulas.
∙ Improved calculation history for faster viewing and access to results. 1.9.1 Sep 7 ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025
Scientific Calculator fx-991 version 1.9.1
Updated At: 2026-09-19
Changes: Version History ∙ Updated the formula interface and added the periodic table of elements.
∙ Added lists of favorite and recently viewed formulas.
∙ Improved calculation history for faster viewing and access to results. 1.9.1 Sep 7 ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025
Scientific Calculator fx-991 version 1.9.1
Updated At: 2026-09-11
Changes: Version History ∙ Updated the formula interface and added the periodic table of elements.
∙ Added lists of favorite and recently viewed formulas.
∙ Improved calculation history for faster viewing and access to results. 1.9.1 3d ago ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025
Scientific Calculator fx-991 version 1.9.0
Updated At: 2026-09-04
Changes: Version History ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 Aug 21 ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025 Faster, smoother, and more stable learning app to support your study journey! 1.6.3 04/25/2025
Scientific Calculator fx-991 version 1.9.0
Updated At: 2026-08-23
Changes: Version History ◆ Enhanced derivative feature: now supports finding the derivative expression of a function, in addition to calculating the derivative value at a specific point.
◆ Performance improvements and bug fixes. 1.9.0 1d ago ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025 Faster, smoother, and more stable learning app to support your study journey! 1.6.3 04/25/2025
Scientific Calculator fx-991 version 1.8.9
Updated At: 2026-08-01
Changes: Version History ∙ More detailed step-by-step solutions for equations and inequalities.
∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises.
∙ Performance improvements and bug fixes. 1.8.9 Jul 25 Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025 Faster, smoother, and more stable learning app to support your study journey! 1.6.3 04/25/2025 We have fixed the issue with the Premium subscription. 1.6.2 04/07/2025
Scientific Calculator fx-991 version 1.8.8
Updated At: 2026-07-23
Changes: Version History Optimize speed and detailed results when solving quadratic equations, fractional equations, and rational equations. 1.8.8 May 23 • Improved accuracy of integral calculations for better results
• Fixed edge cases in numerical integration 1.8.5 May 18 ∙ Improved and optimized search results when users look up formulas and knowledge. 1.8.4 May 14 Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 May 5 Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025 Faster, smoother, and more stable learning app to support your study journey! 1.6.3 04/25/2025 We have fixed the issue with the Premium subscription. 1.6.2 04/07/2025 We have fixed the issue with the Premium subscription. 1.6.1 03/26/2025
Scientific Calculator fx-991 version 1.8.3
Updated At: 2026-05-08
Changes: Version History Search improvements and optimization:
∙ We have added more physics and math formulas.
∙ Free users can now search without limits. 1.8.3 3d ago Optimize and improve the SOLVE function 1.8.2 Apr 24 Fixed a payment issue when upgrading to premium plans. 1.8.1 Apr 11 + Optimized button size for a more realistic and comfortable tapping experience
+ Improved app launch speed 1.8.0 Apr 9 New: 350ES calculator interface added 1.7.9 Mar 31 + Improved and enhanced search results.
+ Fixed issues in the complex numbers section. 1.7.8 Mar 15 + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy. 1.7.7 Jan 25 Enter equations directly on the keyboard. The app helps you analyze variations, find extrema, and plot graphs of familiar equations from the high school curriculum. 1.7.6 11/25/2025 The interface changes based on iOS 26.1 provide a more visually appealing design. 1.7.5 11/16/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.4 11/02/2025 • More detailed explanations for solving quadratic equations.
• Added explanatory insights for statistics and numerical results. 1.7.3 10/23/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types. 1.7.2 10/08/2025 Learn math more easily with the new.
Graphs Automatically recognizes equation and inequality types 1.7.1 10/01/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.7.0 09/22/2025 Added feature to find solutions and provide detailed explanations for inequalities.
+Linear inequalities, quadratic inequalities.
+Irrational inequalities (with square roots).
+Fractional inequalities. 1.6.9 09/16/2025 - Minor bug fixes and overall performance improvements. 1.6.7 07/17/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.6 07/07/2025 In the latest version, after solving first, second, and third degree equations, the app will display the graph of the equation along with some similar example equations to help you better understand it. 1.6.5 07/05/2025 Improved speed and user experience when using the search feature. 1.6.4 06/12/2025 Faster, smoother, and more stable learning app to support your study journey! 1.6.3 04/25/2025 We have fixed the issue with the Premium subscription. 1.6.2 04/07/2025 We have fixed the issue with the Premium subscription. 1.6.1 03/26/2025 + Add a function to automatically display the result.
+ Add a function to input the comparison symbol. (For example, 98+7?100-34) 1.5.8 03/03/2025 + Add an option to enable or disable automatic calculation.
+ Increase data analysis speed. 1.5.7 02/21/2025 + Add a function to automatically display the result.
+ Add a function to input the comparison symbol. (For example, 98+7?100-34) 1.5.6 02/09/2025
Scientific Calculator fx-991 version 1.7.7
Updated At: 2026-01-25
Changes: + Improved design (button sizes are now more balanced and user-friendly).
+ Enhanced calculation and analysis speed for certain equations and inequalities.
+ Increased graph detail and rendering accuracy.
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