# uu vs Not Not

The clearest difference is rating: Not Not at 4.7 against uu's 3.7. Not Not also leads on review sentiment (78% vs 47%) and update cadence (every 2 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Not Not holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: Not Not has 1.1K ratings behind it against 202, so its average is the more settled of the two. Written reviews point the same way: 47% of uu's written reviews are positive against 78% of Not Not's.

uu ships an update every 2 months, Not Not every 2 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | uu | Not Not |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (202 ratings)](https://appshunter.io/ios/app/uu/id927819165/reviews) | **[4.7 (1.1K ratings)](https://appshunter.io/ios/app/not-not-a-brain-buster/id1107589341/reviews)** |
| Number of ratings | 202 | **1.1K** |
| Positive reviews | 47.1% of reviews | **78.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 132 MB | 75 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [General Adaptive Apps Pty Ltd](https://appshunter.io/developer/937589555) | [Alternative Shift](https://appshunter.io/developer/394617049) |

## 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


### Not Not

[App page](https://appshunter.io/ios/app/not-not-a-brain-buster/id1107589341)

Engage your brain with a logic and orientation puzzle game. Swipe your character according to increasingly complex instructions to reach higher levels. Offers two addictive game modes for a satisfying challenge.

**Highlights:** Logic and orientation challenges, Swipe-based character control, Increasingly complex instructions, Classic game mode, Challenge game mode, Addictive gameplay

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $0.99 | one-time |
| Unlock World : The Liar | $0.99 | one-time |
| Emergency Kit | $0.99 | one-time |
| First Aid Kit | $0.99 | one-time |
| Survival Kit | $2.99 | one-time |
| Complete Kit | $4.99 | one-time |
| Immortal Kit | $9.99 | one-time |
| Ultimate Kit | $29.99 | one-time |

**What reviewers like**

- 🧠 Challenges the brain
- 🕹 Engaging and addictive gameplay
- 🕰 Good time-killer
- 👍 Simple yet effective game mechanics

**What reviewers complain about**

- 📺 Excessive ads and monetization
- 🐛 Bugs and technical issues
- 🔄 Language settings reset after each session
- 🔍 Difficulty progression can be uneven

**Reported bugs**

- Game freezes on startup
- Purchased ad removal not working
- Inconsistent swipe/input detection

**Requested features**

- More levels and game modes
- Option to disable music/sound effects
- Improved accessibility for color-blind players


## Frequently asked questions

### Is uu free?

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

### Is Not Not free?

Not Not is free to download, with in-app purchases available.

### Which has better reviews, uu or Not Not?

Not Not is rated higher. uu averages 3.7 out of 5 from 202 ratings, while Not Not averages 4.7 from 1.1K ratings.

### Do uu or Not Not have ads?

Both uu and Not Not show ads.

### Which is updated more often, uu or Not Not?

uu ships an update every 2 months, and Not Not every 2 weeks. Most recently, uu was updated on November 1, 2026 and Not Not on November 6, 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.*