# Formulus Free — user reviews > 169 indexed App Store user reviews of Formulus Free by Daniel Byon, rated 5.00/5 from 5 ratings. - Source: https://appshunter.io/ios/app/formulus-free/id309681718/reviews - App overview in markdown: https://appshunter.io/ios/app/formulus-free/id309681718.md - Rating breakdown: 5★ 5 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 0 ## What do users think of Formulus Free? Overall sentiment: positive **Pros** - 👍 Excellent organization and easy navigation - 🚀 Quick and convenient formula lookup - 📚 Comprehensive coverage of calculus and math formulas - 💰 Free app with extensive content - 🎓 Great study and review tool for students - 📖 Clear explanations without unnecessary complexity - ✅ Accurate formulas for most topics - 🔍 Well-organized by mathematical categories - ⭐ Highly useful for AP Calculus and college courses - 🎯 Perfect for quick reference during exams **Cons** - 🐛 Frequent crashes and freezing issues - 📱 Poor compatibility with larger iPhone screens - ❌ Some formulas contain errors or typos - 🔍 Missing several important formulas and topics - 📊 No interactive features or worked examples - 🔤 Limited to English language only - ⚠️ Some formulas displayed as empty or blurry - 📈 Lacks advanced features like graphing or calculation - 🔄 App doesn't remember previous location after closing - 🎨 Inconsistent formatting in some sections **Commonly reported bugs** - App crashes on startup after updates - Freezing and lag issues during use - Compatibility issues with larger iPhone screens - Incorrect cross product entry formula - Error in Simpson's rule integral approximation - Typo in power series expansion for cos(x) - Incorrect absolute value notation in some formulas - Change-of-base formula error - Inconsistent header display (wrong category shown) - Some formula entries are empty or incomplete - Blurry image quality for some formulas - Taylor series functionality not working - App stops opening after certain updates **Most requested features** - Add practice problems and worked examples - Include inverse trigonometric functions - Add 3D shapes and geometry formulas - Implement search functionality for quick formula finding - Add graphing and calculation capabilities - Include zoom feature for better readability - Add definitions and learning explanations - Separate Algebra and Geometry into distinct categories - Allow users to add personal notes and corrections - Support for multiple languages - Remember app location when reopening - Expand power series expansions section - Include tabular integration by parts method - Add radius of convergence information - Include Euler's formula in complex numbers section ## Newest reviews (17 of 169) ### 5/5 — Fantastic *2015-08-25, version 3.1.4* Great!!! ### 5/5 — Thumbs up! *2015-08-22, version 3.1.4* I'm loving this app! Very helpful for us students! 😁 ### 5/5 — Helpful *2015-04-12, version 3.1.1* The simple app has all equations in all mathematic subjects. ### 5/5 — Excelente para estudantes de engenharia! *2015-03-31* Possui todas tabelas de derivadas, integrais... ### 4/5 — Compatibility *2015-01-10* The app seems great and has a lot of useful information, but it doesn't seem to be completely compatible with the larger iPhones. The screen size is a little bit obnoxious. ### 5/5 — Review *2013-08-23, version 3.0.3* This beauty of an app will sort you out for a maths degree or higher level mathematical study. Its a must have for all the little annoying laws ### 3/5 — Great app *2013-06-12, version 3.0.3* Good app but the cross product entry is wrong. ### 5/5 — Typo *2013-06-05* Great app, love it. FYI, there's a mistake in the power series expansion. For cos(x) you used cosh(x) which is not the same. The power series expansion for cos(x) is an alternating series, on the other hand, cosh(x) is the power series of cos(x) but you have to take the abs value of each term (not the same as abs val of the whole series). I just wanted to point out that typo. ### 5/5 — Awesome *2013-05-24, version 3.0.3* Awesome app! ### 5/5 — Hthggfh *2013-05-06, version 3.0.3* Ghbhbtbhhhh ### 5/5 — Great App *2013-04-15, version 3.0.3* Neatly places and organizes topics in appropriate categories. Calculus can actually be TAUGHT from this app easily. ### 5/5 — Where was this app my first 2 years of college!? *2013-03-15, version 3.0.3* Great app. - Nicely organized - Easy to understand (if you already understand diff Eq) - Not a teaching tool, but makes for a good referencing tool ### 2/5 — No inverse trig functions *2013-02-24, version 3.0.3* Right when I needed a reminder of arcsin derivatives before a test, come to find this app had none. Very disappointed. ### 5/5 — Everything you'd hope for *2013-02-14, version 3.0.3* Has mostly everything one would need on a DE class & seems bug-free to boot! ### 5/5 — Great app *2013-02-08, version 3.0.3* It has basic calculus and DE equations. Has helped me out of a jam more than once. ### 5/5 — Advanced Mathematics *2013-01-28, version 3.0.3* Brings back memories of the old GCE 'O' level Maths exams. This stuff seems to have migrated to 'A' Level and beyond nowadays. ### 4/5 — Useful *2013-01-06* It's a very good listing of useful formulas in high school/college math. I noticed two small errors (the abs(a)>=0, not just >0 and the change-of-base formula actually needs to CHANGE the base) and the formatting had a weird moment (why are the if...then statements for l'Hospital with two bullet points while all other conditions are in the same one?). ## Most critical reviews (10 lowest-rated) ### 1/5 — No. Not working. *2016-09-27, version 3.1.4* Delete agad agad. Di gumagana. ### 1/5 — Does not work *2015-03-15, version 3.1* Starts but does not make its work on 7.1.2 Impossible to write to the developer ### 1/5 — Useless *2014-08-30, version 3.0.3* Not worth the time it took to download. Try Google. ### 1/5 — Mimi *2011-10-17, version 3.0.3* I lode of old rubbish ### 1/5 — Not for me *2011-03-09, version 3.0.3* I'm in year 10 and I thought this app was a no go for me. I didn't get all the technical language, and it's not really suited for some one under year 12 ### 1/5 — Do not get. *2010-11-12, version 0* Laggy, crashes, iFormulas is much better. ### 1/5 — Good and bad *2010-10-22, version 0* Has the formulas I'm looking for, but constantly freezes. Plz fix this! ### 1/5 — Crash!!!! *2010-06-20, version 0* Dopo l'aggiornamento non va! U.U ### 1/5 — Bad update *2010-06-20, version 0* App stopped openning since new update! ### 1/5 — Update NOT Recommended *2010-06-20, version 0* Since the latest update this app no longer works. ## Most praised reviews (10 highest-rated) ### 5/5 — Excellent app for learning or refreshing math skills. *2020-02-10* Excellent app! ### 5/5 — Great app *2019-09-04, version 4.0* I was looking for a an app that has formulas in proper order and this app was the one. Has all formulas in a clean order, very helpful for preparing for exams or etc. ### 5/5 — Thanks for the developers *2019-02-23, version 4.0* Pretty good app. Helped me a lot ### 5/5 — Great app! *2018-07-21, version 4.0* Great job, and it could be greater if it has practices ### 5/5 — Harika (must have) *2017-09-26, version 4.0* Calculus için gerekebilecek her formül parmak ucunuzda. İntegral türev vs vs ### 5/5 — Incredibly straightforward *2016-10-04, version 3.1.4* Extremely handy app, equations are explained without all the fluff, which is nice when you need a quick answer 👍🏻👍🏻👍🏻 ### 5/5 — Great app *2016-09-17, version 3.1.4* Every formula I've needed I've found here ### 5/5 — Excelent *2016-06-30, version 3.1.4* I haven't found any other that has so much formulas, it's excellent and super helpful. ### 5/5 — No reason not to have it *2016-02-16, version 3.1.4* Very handy and convenient for my Calc 1 class. It beats looking back through pages of notes by far! ### 5/5 — Wonderful *2015-09-22, version 3.1.4* It's an amazing app to use for study guide and to expand my mind in the mathematic field!! Absolutely love it! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*