# One Brain vs DEFINED.

The clearest difference is price: One Brain at Free against DEFINED.'s $1.99. One Brain also leads on ratings volume (297 vs 6). DEFINED.'s advantage is rating (5.0 vs 4.4) and review sentiment (100% vs 59%). On update cadence, device support and iOS requirement there is nothing between them.

One Brain is free to download; DEFINED. costs $1.99 up front. One Brain sells 1 one-off in-app purchase. DEFINED. asks for nothing beyond the download.

DEFINED. holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: One Brain has 297 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 59% of One Brain's written reviews are positive against 100% of DEFINED.'s.

One Brain ships an update weekly, DEFINED. every 8 days. Both last shipped on October 13, 2026.

## The numbers

| Metric | One Brain | DEFINED. |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.4 (297 ratings)](https://appshunter.io/ios/app/one-brain/id1229367064/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/defined/id6757622967/reviews)** |
| Number of ratings | **297** | 6 |
| Positive reviews | 58.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 8 days |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#77** |
| Size | 10 MB | 27 MB |
| Requires iOS | **15** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Erik Wegener](https://appshunter.io/developer/424482392) | [Doug Hicks](https://appshunter.io/developer/1852838382) |

## What reviewers say

### One Brain

[App page](https://appshunter.io/ios/app/one-brain/id1229367064)

Test your cognitive abilities with a game inspired by the Stroop effect. Quickly identify matching colors, arrow directions, or true/false math equations under time pressure. Challenge your brain to process conflicting information and achieve high scores.

**Highlights:** Stroop effect inspired gameplay, Color matching challenges, Arrow direction tests, Math equation verification, Timed gameplay, Score tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 👍 Simple and effective brain training
- 🧠 Helps improve focus and concentration
- 🤯 Challenging and addictive gameplay

**What reviewers complain about**

- ⏱️ Timer is too short, needs more time
- 🙄 Excessive ads and interruptions
- 🤖 Inconsistent scoring and feedback

**Reported bugs**

- Incorrect registering of correct answers
- Crashes and freezes on certain devices
- Keyboard controls not working as expected

**Requested features**

- Adjustable difficulty levels
- More game modes and variations
- Option to disable ads or pay for ad-free version


### DEFINED.

[App page](https://appshunter.io/ios/app/defined/id6757622967)

**Currently charting:** #77 Top Paid · Word (US App Store)

This game challenges you to find the correct word based on its definition from a list of options. Points decrease over time, and incorrect choices disappear, adding a strategic element to guessing. It offers multiple game modes to test your vocabulary and quick thinking.

**Highlights:** Guess words from definitions, Timed scoring, Disappearing incorrect options, Daily Challenge mode, Classic and Hardcore modes, Head-to-Head challenges, Personal dictionary building

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is One Brain free?

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

### Is DEFINED. free?

DEFINED. costs $1.99, with no in-app purchases.

### Which has better reviews, One Brain or DEFINED.?

DEFINED. is rated higher. One Brain averages 4.4 out of 5 from 297 ratings, while DEFINED. averages 5.0 from 6 ratings.

### Do One Brain or DEFINED. have ads?

One Brain shows ads; DEFINED. does not.

### Which is updated more often, One Brain or DEFINED.?

One Brain ships an update weekly, and DEFINED. every 8 days. Most recently, One Brain was updated on October 13, 2026 and DEFINED. on October 13, 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.*