# Not Not vs Eureka

The clearest difference is update cadence: Not Not at every 2 weeks against Eureka's every 4 weeks. Eureka's advantage is iOS requirement (12.0 vs 15.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Not Not sells 8 one-off in-app purchases and Eureka sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Not Not against 4.7 for Eureka. Both are backed by a comparable volume of ratings — 1.1K and 513 respectively. Written reviews are what separate them: 78% of Not Not's written reviews are positive against 77% of Eureka's.

Not Not ships an update every 2 weeks, Eureka every 4 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Not Not | Eureka |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.1K ratings)](https://appshunter.io/ios/app/not-not-a-brain-buster/id1107589341/reviews)** | [4.7 (513 ratings)](https://appshunter.io/ios/app/eureka-brain-training/id1485438085/reviews) |
| Number of ratings | **1.1K** | 513 |
| Positive reviews | **78.4% of reviews** | 76.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 75 MB | 140 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Alternative Shift](https://appshunter.io/developer/394617049) | [INFINITY GAMES, LDA](https://appshunter.io/developer/1088875165) |

## What reviewers say

### 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


### Eureka

[App page](https://appshunter.io/ios/app/eureka-brain-training/id1485438085)

This app offers over 50 mini-games designed to test and improve various cognitive skills like logic, memory, creativity, and focus. It provides a fun and challenging way to stimulate your brain and see if you can outsmart others.

**Highlights:** Over 50 mini-games, Tests logic, memory, creativity, speed, Improves focus and brain skills, Diverse and unique puzzles, Addictive brain challenge

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 🤩 Fun and engaging gameplay
- 🧠 Challenges the mind
- 👍 Kid-friendly
- 😍 Addictive and immersive
- 💯 Great for cognitive exercise

**What reviewers complain about**

-  anúncios Ads are intrusive
- 🗑️ Paid version still has ads
- 🧩 Lacks variety in puzzles

**Reported bugs**

- Ads after every level
- Paid version with ads


## Frequently asked questions

### Is Not Not free?

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

### Is Eureka free?

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

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

Not Not is rated higher. Not Not averages 4.7 out of 5 from 1.1K ratings, while Eureka averages 4.7 from 513 ratings.

### Do Not Not or Eureka have ads?

Both Not Not and Eureka show ads.

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

Not Not ships an update every 2 weeks, and Eureka every 4 weeks. Most recently, Not Not was updated on October 23, 2026 and Eureka 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.*