# Formulus Free — Formulas for Calculus

> A digital reference for calculus and related math formulas. (iPhone/iPad app by Daniel Byon.)

- Source: https://appshunter.io/ios/app/formulus-free/id309681718 (this page in markdown: same URL + `.md`)
- Developer: [Daniel Byon](https://appshunter.io/developer/309681721)
- Category: Education, Reference
- Price: Free
- Rating: 5.00/5 from 5 App Store ratings · 169 written reviews indexed
- Age rating: +4
- Requires: iOS 14.0 · 12 MB
- Languages: American English
- Released: 2009-04-01
- Data updated: 2026-08-21
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/formulus-free/id309681718/reviews.md

## What is Formulus Free?

Have you ever needed to know that one math formula that you always forget? Do you spend minutes flipping through your textbook or searching the internet for it? Then you need Formulus! 

Formulus is the perfect study tool. It is a simple, easy to use, easy to navigate collection of the most important formulas and topics for high school and college students taking Calculus. 

Includes the following subject areas: 
- Algebra & Geometry 
- Derivatives 
- Functions 
- Integrals 
- Limits
- Logarithms
- Matrices
- Partial Derivatives 
- Series & Sequences 
- Trigonometry 
- Vectors

## Key features

- Calculus formula collection
- Algebra and Geometry formulas
- Derivatives
- Integrals
- Limits
- Trigonometry
- Vectors

## 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

## Recent user reviews (10 of 169)

All indexed reviews: https://appshunter.io/ios/app/formulus-free/id309681718/reviews.md

### 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 👍🏻👍🏻👍🏻

### 1/5 — No. Not working.

*2016-09-27, version 3.1.4*

Delete agad agad. Di gumagana.

### 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!

## Frequently asked questions about Formulus Free

### What does Formulus Free do?

Formulus Free provides a digital collection of essential math formulas for high school and college calculus students. It aims to save users time by offering quick access to formulas they might otherwise forget or need to search for.

### What math subjects are covered in Formulus Free?

The app covers a wide range of subjects crucial for calculus, including Algebra & Geometry, Derivatives, Functions, Integrals, Limits, Logarithms, Matrices, Partial Derivatives, Series & Sequences, Trigonometry, and Vectors.

### Is Formulus Free a paid app?

Formulus Free is available at no cost to users. However, it does display advertisements within the application.

### Who is the target audience for Formulus Free?

This app is designed for high school and college students who are taking calculus courses. It serves as a convenient study tool for anyone needing to reference mathematical formulas.

### How does Formulus Free help students?

It acts as a digital reference guide, allowing students to quickly find and review important formulas without the need to consult textbooks or perform online searches. This can significantly speed up study sessions and homework completion.

## Version history (last 5 releases)

### 4.0.1 — 2020-11-19

Formulus has undergone a complete rewrite. Performance should be much faster, and better adapt to your device.

### 4.0 — 2017-08-02

- Fixed formula sheet errors
- Reorganized formulas

Look out for more future enhancements!

### 3.1.4 — 2015-07-30

- Bug fixes
- Fix for crash on Differential Equations -> Terminology

Formulus Free is now a Universal app! The current iPad-only version of Formulus will be removed from the App Store soon.

### 3.1.3 — 2015-07-28

Formulus Free is now a Universal app! The current iPad-only version of Formulus will be removed from the App Store soon.

### 3.1.2 — 2015-04-23

Fixed crash related to Differential Equations->Terminology formulas

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All apps by Daniel Byon: https://appshunter.io/developer/309681721

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*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.*