# ColorBrain vs Inkstroop

The clearest difference is in-app purchases: Inkstroop at none against ColorBrain's 2. Inkstroop also leads on update cadence (every 3 days vs every 4 months). ColorBrain's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. ColorBrain sells 2 in-app purchases, starting at $3.99 per month. Inkstroop asks for nothing beyond the download.

ColorBrain ships an update every 4 months, Inkstroop every 3 days. The most recent releases landed on October 15, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | ColorBrain | Inkstroop |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 2 MB | 5 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bogdan Nikishin](https://appshunter.io/developer/1735946582) | [BIN WANG](https://appshunter.io/developer/1881032464) |

## What reviewers say

### ColorBrain

[App page](https://appshunter.io/ios/app/colorbrain-brain-training/id6758952446)

Train your attention and reaction time with quick daily exercises. This app offers four classic cognitive tests that adapt to your skill level, providing insights into your focus and speed. Build a consistent habit with streaks and reminders.

**Highlights:** Four attention training modes, Adaptive difficulty, Daily challenges, Reaction time tracking, Distraction cost insights, Daily streaks and reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Annual Plan (Best Value) | $29.99 | per year |


### Inkstroop

[App page](https://appshunter.io/ios/app/inkstroop/id6771827113)

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

**In-app purchases:** none


## Frequently asked questions

### Is ColorBrain free?

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

### Is Inkstroop free?

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

### Do ColorBrain or Inkstroop have ads?

Inkstroop shows ads; ColorBrain does not.

### Which is updated more often, ColorBrain or Inkstroop?

ColorBrain ships an update every 4 months, and Inkstroop every 3 days. Most recently, ColorBrain was updated on October 15, 2026 and Inkstroop on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*