# Brain vs String AI

Brain and String AI are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Brain sells 1 one-off in-app purchase and String AI sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Brain | String AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 25 MB | 77 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Louis, Paul, Joseph PAGNIER](https://appshunter.io/developer/1745960401) | [Joshua Vigel](https://appshunter.io/developer/6801934740) |

## What reviewers say

### Brain

[App page](https://appshunter.io/ios/app/brain-skills/id6502577701)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro version | $5.99 | one-time |


### String AI

[App page](https://appshunter.io/ios/app/string-ai/id6801934738)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| String AI Pro | $9.99 | per month |
| String AI Pro | $59.99 | per year |


## Frequently asked questions

### Is Brain free?

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

### Is String AI free?

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

### Do Brain or String AI have ads?

Neither Brain nor String AI shows ads.

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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.*