# uu vs Mars 2501

The clearest difference is ads: Mars 2501 at none against uu's shown. uu's advantage is update cadence (every 2 months vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. uu sells 8 in-app purchases, starting at $1.99 per month and Mars 2501 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

uu ships an update every 2 months, Mars 2501 every 3 months. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | uu | Mars 2501 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (202 ratings)](https://appshunter.io/ios/app/uu/id927819165/reviews)** | — |
| Number of ratings | **202** | — |
| Positive reviews | 47.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 132 MB | 111 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [General Adaptive Apps Pty Ltd](https://appshunter.io/developer/937589555) | [Janek Soomets](https://appshunter.io/developer/1315295062) |

## What reviewers say

### uu

[App page](https://appshunter.io/ios/app/uu/id927819165)

This is a minimalist puzzle game with 200 challenging levels, offering a fun and intricate experience. It features a level selection system, the ability to replay past levels, and options to skip difficult stages or unlock all levels.

**Highlights:** 200 challenging levels, Leaderboards and medals, Replay past levels, Skip difficult levels, Unlock all levels

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| uu Legend | $1.99 | per month |
| uu Legend | $19.99 | per year |
| Skip uu Level | $0.49 | one-time |
| Skip 3 Levels | $1.29 | one-time |
| Skip 5 Levels | $1.99 | one-time |
| Remove uu Ads | $5.99 | one-time |
| Unlock All of uu | $7.99 | one-time |
| Unlock all + remove ads | $10.99 | one-time |

**What reviewers like**

- 🎮 Great offline time sink
- 👍 Addictive and challenging
- 🎯 Levels 1-4 passed with ease

**What reviewers complain about**

- 🔁 Level 5 impossible
- 🔁 Level 155 freezes
- 🐛 Occasional glitches and bugs

**Reported bugs**

- Dots spawn inside central circle on iPhone
- Center stops spinning before pins run out on level 155
- Dots migrate to inside of circle on level 142

**Requested features**

- Option to skip difficult levels
- More color and music
- Level progress indicators


### Mars 2501

[App page](https://appshunter.io/ios/app/mars-2501/id6746960028)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Mars 2501 | $4.99 | one-time |


## Frequently asked questions

### Is uu free?

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

### Is Mars 2501 free?

Mars 2501 is free to download, with in-app purchases available.

### Do uu or Mars 2501 have ads?

uu shows ads; Mars 2501 does not.

### Which is updated more often, uu or Mars 2501?

uu ships an update every 2 months, and Mars 2501 every 3 months. Most recently, uu was updated on November 1, 2026 and Mars 2501 on October 28, 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.*