# NumbBrain vs Graylin

The clearest difference is update cadence: Graylin at every 3 days against NumbBrain's fortnightly. Graylin also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. NumbBrain sells 3 in-app purchases, starting at $1.99 per month and Graylin sells 10 in-app purchases, starting at $34.99 per month. Whichever you choose, the download price is not the number that matters.

NumbBrain ships an update fortnightly, Graylin every 3 days. The most recent releases landed on November 12, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | NumbBrain | Graylin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 14 MB | 42 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [笛 姜](https://appshunter.io/developer/1561507357) | [GRAYLIN AI (PTY) LTD](https://appshunter.io/developer/1872989548) |

## What reviewers say

### NumbBrain

[App page](https://appshunter.io/ios/app/numbbrain-screen-time-control/id6751564003)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.99 | per month |
| Annual Premium | $2.99 | per year |
| Lifetime Premium | $5.99 | one-time |


### Graylin

[App page](https://appshunter.io/ios/app/graylin/id6759706980)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Graylin Starter | $34.99 | per month |
| Graylin Pro | $57.99 | per month |
| Graylin Team | $114.99 | per month |
| Graylin Starter Year | $219.99 | per year |
| Graylin Pro Year | $579.99 | per year |
| Graylin Team Year | $1000.00 | per year |
| 5 AI Credits | $5.99 | one-time |
| 10 AI Credits | $11.99 | one-time |
| 25 AI Credits | $29.99 | one-time |
| 50 AI Credits | $59.99 | one-time |


## Frequently asked questions

### Is NumbBrain free?

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

### Is Graylin free?

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

### Do NumbBrain or Graylin have ads?

Neither NumbBrain nor Graylin shows ads.

### Which is updated more often, NumbBrain or Graylin?

NumbBrain ships an update fortnightly, and Graylin every 3 days. Most recently, NumbBrain was updated on November 12, 2026 and Graylin on October 31, 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.*