# SkyGO vs Physics Zen

The clearest difference is update cadence: Physics Zen at every 2 days against SkyGO's monthly. Physics Zen also leads on iOS requirement (16.4 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SkyGO sells 2 in-app purchases, starting at $9.99 per month and Physics Zen sells 6 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

SkyGO ships an update monthly, Physics Zen every 2 days. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SkyGO | Physics Zen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 4 MB | 82 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nikita Petrov](https://appshunter.io/developer/6794622217) | [Ivan Terekhin](https://appshunter.io/developer/888645337) |

## What reviewers say

### SkyGO

[App page](https://appshunter.io/ios/app/skygo-pilot-aptitude-test/id6803723295)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkyGo Pro — Monthly | $9.99 | per month |
| SkyGo Pro — 6 Months | $24.99 | per 6 months |


### Physics Zen

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

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

**In-app purchases (6)**

| 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 | $29.99 | one-time |
| Physics Zen Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is SkyGO free?

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

### Is Physics Zen free?

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

### Do SkyGO or Physics Zen have ads?

Neither SkyGO nor Physics Zen shows ads.

### Which is updated more often, SkyGO or Physics Zen?

SkyGO ships an update monthly, and Physics Zen every 2 days. Most recently, SkyGO was updated on October 16, 2026 and Physics Zen on October 24, 2026.

---

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