# Horizon Class vs Physics Zen

The clearest difference is in-app purchases: Horizon Class at none against Physics Zen's 5. Physics Zen's advantage is update cadence (daily vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Physics Zen sells 5 in-app purchases, starting at $3.99 per 7 days. Horizon Class asks for nothing beyond the download.

Horizon Class ships an update every 3 weeks, Physics Zen daily. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Horizon Class | Physics Zen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 115 MB | 269 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Ruden Naggai ELENGA GOMEZ](https://appshunter.io/developer/1848458529) | [Ivan Terekhin](https://appshunter.io/developer/888645337) |

## What reviewers say

### Horizon Class

[App page](https://appshunter.io/ios/app/horizon-class/id6754470109)

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

**In-app purchases:** none


### Physics Zen

[App page](https://appshunter.io/ios/app/physics-zen-learn-and-practice/id6808595963)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physics Zen Weekly | $3.99 | per 7 days |
| Physics Zen Monthly | $6.99 | per month |
| Physics Zen Annual | $29.99 | per year |
| Physics Zen Lifetime | $24.99 | one-time |
| Physics Zen Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Horizon Class free?

Horizon Class is free to download, with no in-app purchases.

### Is Physics Zen free?

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

### Do Horizon Class or Physics Zen have ads?

Neither Horizon Class nor Physics Zen shows ads.

### Which is updated more often, Horizon Class or Physics Zen?

Horizon Class ships an update every 3 weeks, and Physics Zen daily. Most recently, Horizon Class was updated on October 17, 2026 and Physics Zen on October 12, 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.*