# StemFox Scientific Calculator — Engineering Equation Solver > Engineering calculator with textbook equation solver and unit converter. (iPhone/iPad app by Joshua Bryson.) - Source: https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118 (this page in markdown: same URL + `.md`) - Developer: [Joshua Bryson](https://appshunter.io/developer/1367675392) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 4.80/5 from 10 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 15 · 16 MB - Languages: American English - Released: 2018-10-16 - Data updated: 2026-06-04 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118/reviews.md ## What is StemFox Scientific Calculator? Become a better engineer! Stop wasting your time on pointless busy work! Complete your calculations more quickly and accurately. Designed by an engineer, for engineers, StemFox has all the tools you need: Calculator STEM homework is technical and demanding. Accordingly, StemFox includes a calculator able to handle the most complex equations. From trigonometry to Bessel functions, StemFox has you covered! ･More than 80 mathematical functions. ･Quick reference to common basic scientific functions and operators. ･Quickly and easily copy and paste values. ･Quickly reference calculations in all parts of the app. ･Reference previous calculations via the ans(x) method. ･Prettyprint formatting of calculations. Textbook Companions Homework is an important portion of education. Entering equations into your calculator is not. Yet, this tedious error prone activity takes up a significant portion of homework time. Enter StemFox Textbook Companions. Textbook Companions contain references to a textbook’s equations and tables. Equations: ･Equations are referenced by number and name/description. ･Equations are searchable and divided into chapters for quick reference. ･Equations are solvable for any variable. Enter the known variables, and solve for the unknown one. ･Avoid error prone calculator entry. ･Avoid the errors and tedium of entering variables multiple times in the same equation. ･Decreases calculation time by as much as 90% over entering the entire formula yourself! Tables: ･Quickly lookup table values. ･Fast, easy, accurate, table linear interpolation. ･Copy and paste values with a simple tap, no transcription errors! Yay! Unit Converter Unit conversion is a common STEM activity. To speed up this irritating activity, StemFox offers the most comprehensive scientific unit converter available! ･More than two dozen separate units and nearly 300 individual conversions available. ･Tap to copy, tap to paste. SUBSCRIPTION INFORMAITON: • Subscribe on a monthly or annual basis to receive Unlimited Daily Solutions for the duration of the subscription. • Payment will be charged to iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Setting after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription, where applicable. Terms of Use: http://stemfox.io/index.php/eula/ Privacy Policy: http://stemfox.io/index.php/privacy-policy/ ## Key features - Advanced scientific calculator with 80+ functions - Textbook equation solver for any variable - Searchable equation database by chapter - Fast table lookup with linear interpolation - Comprehensive unit converter with 300+ conversions - Copy and paste functionality for values and equations ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Yearly - Unlimited | $9.99 | per year | | Monthly - Unlimited | $2.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Donut | $0.99 | one-time | | Pizza | $9.99 | one-time | | Drink | $2.99 | one-time | | Taco | $4.99 | one-time | ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118/reviews.md ### 5/5 — Zbass *2026-03-10* Tight app! ### 5/5 — Best calculator app ever *2024-09-20* So well done. So much functionality. I can’t believe how many equations and unit conversions this app has. ### 5/5 — Best calculator app ever *2024-01-21* So well done. So much functionality. I can’t believe how many equations and unit conversions this app has. ### 5/5 — Best calculator app ever *2023-11-19* So well done. So much functionality. I can’t believe how many equations and unit conversions this app has. ### 5/5 — Love this app! *2023-02-06, version 2.0.2* My kids use the calculator and I can’t get over how easy the rest of the app is to use! Nice work!! ### 2/5 — Multi-functional but unintuitive *2022-07-16* This is a very capable calculator - if one is prepared to slog away to become familiar with its clunky operation. It uses Reverse Polish Notation, of a sort. In fact that is what stirred my interest. Imagine my surprise then… For my very first experiment, I tried to calculate the square root of 7. Now, an ordinary 'RPN' calculator requires just two keypresses: 7, SQRT (in that order). Very efficient; no need for any other keypress and one of the primary appeals of RPN. Expecting the normal result, I clicked the 7 key and then the SQRT key… – But there wasn't a result. After trying again, I thought maybe it needed the 'Enter' key to get the 7 into the stack. Yes, now it was there, all by itself. So now surely the SQRT key will work? No, still no result. But now the entry bar showed '7()' with a flashing cursor requiring another value to be entered within parentheses and the original '7' about to behave as a multiplying operand upon whatever was inserted between the brackets! Bizarre! Very convoluted for anyone familiar with the wonderful efficiency of (normal) RPN. Of course, I can eventually make it work; but I really don't get why I'm forced to jump through hoops which shouldn't be there at all. Why complicate it by eroding RPN's primary advantage? Needless to say, despite lots of functionality deep within, I've deleted it. I should also warn potential iPad users: sadly, this app does not rotate for landscape view. **Developer response:** Oh so sorry! I’m not sure you had put the calculator in RPN mode. By default it is in algebraic mode (not all people are RPN lovers, their loss!) To toggle RPN mode you need to go into settings, scroll to the calculator options section and choose RPN. Then it should work. Please give it another try! ### 5/5 — Fantastic! *2021-07-18, version 2.0.1* So much content here! Works great! **Developer response:** Glad you like it! ### 5/5 — Great app best features and layout! *2019-12-23* Tried nearly every calculator app out there. This one by far works the best in my opinion. I use a scientific calculator to do electrical calculations and it has been difficult to find one that incorporates all of the features I need in one calculator. This one’s loaded with great features and functions properly, unlike many other calculator apps. Hopefully the locker gets a book for electrical engineering someday😁, that would eliminate my need for one other app 😉... Thank you for your excellent and well thought out work. Thanks for the quick response and repair to the crashing issue, much appreciated!👍 **Developer response:** I’m so sorry! I’ve discovered the bug and am uploading the fix this week! ### 5/5 — Thanks!, *2019-10-30* Thank you so much for taking care of the crashing issue so quickly. This really is a great app for checking my kids’ homework and for use at my business as well. Keep up the great work! **Developer response:** I’m so sorry! A new build will be coming out before the end of the week! ### 5/5 — khalid *2019-02-27* thanks a alot for that really this the best application for engineers and thanks for hear our advice Best wishes khalid ## Frequently asked questions about StemFox Scientific Calculator ### What is StemFox Scientific Calculator? StemFox Scientific Calculator is a utility app designed to assist engineers and STEM students with complex calculations. It features an advanced scientific calculator, a textbook equation solver, and a comprehensive unit converter to streamline technical tasks. ### Does StemFox Scientific Calculator have ads? No, StemFox Scientific Calculator is ad-free, allowing users to focus on their calculations without interruptions. This is consistent with its subscription-based model for unlimited access. ### What are the subscription options for StemFox Scientific Calculator? StemFox Scientific Calculator offers monthly and annual subscriptions for unlimited daily solutions. The monthly plan is $2.99 and the yearly plan is $9.99, both including a 7-day free trial. ### How does StemFox Scientific Calculator help with textbook equations? The Textbook Companions feature allows users to reference equations by number and name, search them by chapter, and solve for any variable. This significantly reduces the time and potential for errors compared to manual calculator entry. ### What kind of unit conversions does StemFox Scientific Calculator support? StemFox Scientific Calculator provides a comprehensive unit converter with over two dozen separate units and nearly 300 individual conversions. Users can quickly look up values and copy them with a single tap. ### Is StemFox Scientific Calculator suitable for younger users? StemFox Scientific Calculator has an age rating of 4+, making it accessible for a wide range of users. Its intuitive design and focus on practical STEM applications are beneficial for students and professionals alike. ### How often is StemFox Scientific Calculator updated? The latest version of StemFox Scientific Calculator is 2.2.1, and it was last updated on August 23, 2025. This indicates a commitment to ongoing development and improvements. ### What devices is StemFox Scientific Calculator available on? StemFox Scientific Calculator is available for iPhone and iPod devices. It is designed to provide a seamless experience on these Apple platforms. ## Version history (last 5 releases) ### 2.2.1 — 2025-08-23 Bug fix. ### 2.2.0 — 2024-05-16 Bug fixes and UI Improvements. ### 2.1.0 — 2024-02-26 Stats! Stats! We've Got Stats here! See? Everybody cares. Over 30 new functions (mostly awesome stats functions). Altered Oblique Shock Equation formulation to improve solution calculation. (Thanks Michael G.!) Minor bug fixes and tweaks. ### 2.0.3 — 2023-02-07 Your life just got easier: - New tutorial experience. - Sweet bug fixes - UI improvements ### 2.0.2 — 2022-11-15 Added Gas Dynamics! 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*