# Particle Zoo vs Physics AI

The clearest difference is review sentiment: Particle Zoo at 81% against Physics AI's 25%. Particle Zoo also leads on in-app purchases (none vs 2) and ads (none vs shown). Physics AI's advantage is rating (4.5 vs 3.9) and ratings volume (289 vs 48). On price, update cadence and device support there is nothing between them.

Both are free to download. Physics AI sells 2 in-app purchases, starting at $5.99 per 7 days. Particle Zoo asks for nothing beyond the download.

Physics AI holds the better App Store score, 4.5 against 3.9. That said, the two scores are not equally well evidenced: Physics AI has 289 ratings behind it against 48, so its average is the more settled of the two. Written reviews complicate that: 81% of Particle Zoo's written reviews are positive against 25% of Physics AI's, so the app with the better star average is not the one people write more warmly about.

Particle Zoo ships an update every 3 weeks, Physics AI fortnightly. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Particle Zoo | Physics AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (48 ratings)](https://appshunter.io/ios/app/particle-zoo/id325403123/reviews) | **[4.5 (289 ratings)](https://appshunter.io/ios/app/physics-ai-problem-solver/id6474350204/reviews)** |
| Number of ratings | 48 | **289** |
| Positive reviews | **81.1% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 14 MB | 16 MB |
| Requires iOS | **11.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [rickbdotcom LLC](https://appshunter.io/developer/325137420) | [Renaissance Apps LLC](https://appshunter.io/developer/1220536592) |

## What reviewers say

### Particle Zoo

[App page](https://appshunter.io/ios/app/particle-zoo/id325403123)

Explore the fundamental building blocks of the universe with this pocket guide to subatomic particles. Learn about the diverse particles that constitute matter and energy, inspired by a popular plush toy collection.

**Highlights:** Subatomic particle information, Pocket-sized reference, Educational tool, Inspired by plush toys

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✨ Informative and educational
- 🎨 Cute and engaging design
- 👍 Easy to use and understand
- 📚 Great reference tool
- 💡 Fun way to learn physics

**What reviewers complain about**

- 🔗 Broken links
- 📉 Outdated content (Higgs Boson)
- ⏳ Lacks depth for advanced users
- 🧸 Appearance a tad childish
- 🖱️ Navigation can be tiring

**Reported bugs**

- Links don't work
- App no longer works on older iOS versions (iOS 11, iOS 6)
- Higgs Boson listed as theoretical
- Some buttons do not work
- App crashes on older devices

**Requested features**

- Add more particles (Build A Baryon, etc.)
- Animate the critters
- Bring back removed features (Build A Baryon, beta decay simulator)
- Update Higgs Boson information
- Add more interactions (strong, electromagnetic)


### Physics AI

[App page](https://appshunter.io/ios/app/physics-ai-problem-solver/id6474350204)

This app acts as a physics problem solver, offering step-by-step solutions for various physics questions. Users can upload or photograph problems, including diagrams and handwritten notes, to receive detailed mathematical explanations. It covers a wide range of physics topics for students at all levels.

**Highlights:** Photo upload for physics problems, Step-by-step mathematical solutions, Covers high school to doctoral research, Copy and share solutions, Handles multiple choice, word-based, and diagram problems

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physics AI Weekly Sub | $5.99 | per 7 days |
| Physics AI - Yearly Sub | $34.99 | per year |

**What reviewers like**

- 👍 Helps with physics class
- 👍 Answers most physics questions correctly
- 👍 Useful for passing online classes
- 👍 Can answer many questions easily
- 👍 Helps understand physics concepts

**What reviewers complain about**

- 🐛 Incorrect answers provided
- 🐛 App shows same question repeatedly
- 🐛 Subscription issues (advertised as free)
- 🐛 Cannot cancel subscription
- 🐛 App keeps loading, doesn't solve

**Reported bugs**

- App shows same question repeatedly
- App not letting user cancel subscription
- App keeps loading instead of solving equations
- App keeps prompting for subscription when advertised as free

**Requested features**

- Ability to talk to AI model for better photo input
- Improvement in AI interaction for photo questions


## Frequently asked questions

### Is Particle Zoo free?

Particle Zoo is free to download, with no in-app purchases.

### Is Physics AI free?

Physics AI is free to download, with in-app purchases available.

### Which has better reviews, Particle Zoo or Physics AI?

Physics AI is rated higher. Particle Zoo averages 3.9 out of 5 from 48 ratings, while Physics AI averages 4.5 from 289 ratings.

### Do Particle Zoo or Physics AI have ads?

Physics AI shows ads; Particle Zoo does not.

### Which is updated more often, Particle Zoo or Physics AI?

Particle Zoo ships an update every 3 weeks, and Physics AI fortnightly. Most recently, Particle Zoo was updated on October 23, 2026 and Physics AI on October 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*