# Dotty vs Physics Zen

The clearest difference is update cadence: Physics Zen at every 2 days against Dotty's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Dotty sells 1 one-off in-app purchase 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.

Dotty ships an update every 3 weeks, Physics Zen every 2 days. The most recent releases landed on October 2, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Dotty | Physics Zen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 29 MB | 84 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Devinet](https://appshunter.io/developer/737922637) | [Ivan Terekhin](https://appshunter.io/developer/888645337) |

## What reviewers say

### Dotty

[App page](https://appshunter.io/ios/app/dotty-reading-and-writing/id6748616008)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Magic Pencil | $5.99 | one-time |


### Physics Zen

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

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo 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 Dotty free?

Dotty 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 Dotty or Physics Zen have ads?

Neither Dotty nor Physics Zen shows ads.

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

Dotty ships an update every 3 weeks, and Physics Zen every 2 days. Most recently, Dotty was updated on October 2, 2026 and Physics Zen on October 26, 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.*