# A vs Euclid Lab

The clearest difference is in-app purchases: Euclid Lab at none against A's 1. Euclid Lab also leads on update cadence (every 3 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. A sells 1 one-off in-app purchase. Euclid Lab asks for nothing beyond the download.

A ships an update every 2 weeks, Euclid Lab every 3 days. The most recent releases landed on October 18, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | A | Euclid Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 271 MB | 14 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ogumo Co., Ltd.](https://appshunter.io/developer/1289277557) | [Yung-Hsin Shieh](https://appshunter.io/developer/6794223212) |

## What reviewers say

### A

[App page](https://appshunter.io/ios/app/a-physics-mechanics/id6670272249)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads | $5.99 | one-time |


### Euclid Lab

[App page](https://appshunter.io/ios/app/euclid-lab/id6801162141)

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

**In-app purchases:** none


## Frequently asked questions

### Is A free?

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

### Is Euclid Lab free?

Euclid Lab is free to download, with no in-app purchases.

### Do A or Euclid Lab have ads?

Neither A nor Euclid Lab shows ads.

### Which is updated more often, A or Euclid Lab?

A ships an update every 2 weeks, and Euclid Lab every 3 days. Most recently, A was updated on October 18, 2026 and Euclid Lab on October 25, 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.*