# Photronium - Physics Equations — A Reference Book for Physics

> Offline physics equation reference with quizzes and intelligent search. (iPhone/iPad app by Hao Nguyen.)

- Source: https://appshunter.io/ios/app/photronium-physics-equations/id1546383517 (this page in markdown: same URL + `.md`)
- Developer: [Hao Nguyen](https://appshunter.io/developer/1546383519)
- Category: Education, Reference
- Price: Free with in-app purchases
- Rating: 5.00/5 from 8 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 59 MB
- Languages: English
- Released: 2021-03-20
- Data updated: 2026-07-17
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/photronium-physics-equations/id1546383517/reviews.md

## What is Photronium?

With over 360 physics equations explained in a clear, easy-to-understand way and a flexible search system, Photronium can be an immensely helpful tool for learners of any level.

PHYSICS AT YOUR FINGERTIPS
Look up any physics equation, with topics including:
• Motion in One Dimension
• Projectile Motion
• Laws of Motion
• Uniform Circular Motion
• Work and Energy
• Linear Momentum and Collisions
• Rotation of Rigid Bodies
• Universal Gravitation
• Fluid Mechanics
• Oscillatory Motion
• Wave Motion
• Sound Waves
• Thermodynamics
• Electromagnetism
• Light and Optics
• Relativity
• Quantum Physics
All available offline, so you can learn anywhere, anytime.

MEMORY QUIZ
Test your knowledge by taking quizzes! Bookmark any section that interests you, and Photronium will automatically create quizzes based on those bookmarks.

INTELLIGENT SEARCH & SYMBOL SEARCH
Just type anything. Intelligent Search can work with the most ambiguous descriptions, like “atom”, “lens”, “radiation”, “Newton”, and “phase angle”. And when you need to find a physics formula without any description, Symbol Search provides a discovery experience you’ve never seen before.

FREE & NO ADS
Photronium comes with over 360 physics equations, Intelligent Search, Symbol Search, Widgets, Bookmarks, Suggested Websites, and Dark Mode all available for free and ad-free. With Extras, you can purchase more features and support the app’s development.

Have questions or feedback? From the app, open Extras and send a report.

## Key features

- 360+ physics equations
- Offline access
- Intelligent Search
- Symbol Search
- Customizable quizzes
- Bookmarking

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Multicolored Bookmarks | $0.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/photronium-physics-equations/id1546383517/reviews.md

### 5/5 — Super helpful and aesthetic app

*2024-08-25, version 2.5.0*

Just a great app in every way and I recommend it to everyone I know studying physics or maths

### 5/5 — Very good app

*2023-05-27, version 2.4.0*

This app will help you a lot in the subject you are learning,but it needs more of them.

### 5/5 — Great app

*2022-11-25*

Could include more content. Although, it is easy to navigate, the layout isn’t confusing, and has no bugs.

### 4/5 — A good start

*2021-12-08, version 1.1.1*

Plenty of familiar equations that are explained just enough that you can get a sense of their use. Excellent visual style and I do like the navigation.

Requests:
Ability to tap on things like Boltzmann constant to get values and a brief explanation of where it comes from.
Maybe a little calculator using the equations? Would be great to very quickly tap in values and get a rough result.
Animations in the visual style.
Missing Navier stokes, viscosity, viscoelastic moduli, etc.

## Frequently asked questions about Photronium

### What physics topics does Photronium cover?

Photronium covers a wide range of physics topics, including Motion in One Dimension, Projectile Motion, Laws of Motion, Work and Energy, Thermodynamics, Electromagnetism, Relativity, and Quantum Physics, among others.

### Can I use Photronium offline?

Yes, all physics equations and features in Photronium are available offline, allowing you to learn and reference information anywhere, anytime without an internet connection.

### How does the quiz feature work in Photronium?

Photronium allows you to bookmark sections you're interested in. The app will then automatically create custom quizzes based on these bookmarks to help you test and reinforce your knowledge.

### Does Photronium have ads?

No, Photronium is completely ad-free. You can access all its core features, including over 360 physics equations and search functionalities, without any advertisements.

### What are the 'Extras' in Photronium?

Extras are additional features available for purchase within Photronium. These purchases help support the app's development and offer expanded functionality beyond the free core features.

### How often is Photronium updated?

The latest version of Photronium is 2.5.0, and it was last updated on August 23, 2024. Updates typically include new features, improvements, and bug fixes.

### What devices is Photronium available on?

Photronium is available for iPhone and iPad devices, making it accessible for users within the Apple ecosystem.

### What is the age rating for Photronium?

Photronium has an age rating of 4+, indicating it is suitable for users of all ages, including children, due to its educational content.

## Version history (last 5 releases)

### 2.5.0 — 2024-08-23

• It is now easier to remove or change bookmark colors.
• If you have purchased Multicolored Bookmarks, you can now change bookmark colors right in the Bookmarks tab.
• Fixed a typo in Bernoulli's equation.
• Improved iOS 16 compatibility: Photronium is now built with new technologies introduced in iOS 16 and no longer supports iOS 15.

### 2.4.0 — 2023-01-22

• The Extras screen gets a more iPad-optimized design.
• For users of Multicolored Bookmarks: Custom colors are more widely applied.

### 2.3.0 — 2022-12-05

• In Equations, Search, and Bookmarks, you can now tap the tab bar to move back to the first page, just like any other iOS apps.
• Saving bookmarks is now snappier, especially on iPhones with Haptic Engine.

### 2.2.1 — 2022-10-08

• The tab bar is now hidden while you're typing in the search field for less distraction.
• Fixed a bug where the default bookmark color is not displayed correctly.

### 2.2.0 — 2022-08-10

• Memory Quiz now shows how long you took to complete a quiz.
• Switching between tabs is more responsive, and tabs no longer lose their state when you switch to a new one.

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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 2026-07-17.*