# OnDevice AI vs Cairn

The clearest difference is update cadence: Cairn at every 2 days against OnDevice AI's every 6 months. Cairn also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OnDevice AI sells 1 one-off in-app purchase and Cairn sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

OnDevice AI ships an update every 6 months, Cairn every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OnDevice AI | Cairn |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 days** |
| Size | 6 MB | 5 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Florin Valentin Micu](https://appshunter.io/developer/1809245808) | [abiodun oyetomi](https://appshunter.io/developer/1895308564) |

## What reviewers say

### OnDevice AI

[App page](https://appshunter.io/ios/app/ondevice-ai/id6752406563)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro Features | $29.99 | one-time |


### Cairn

[App page](https://appshunter.io/ios/app/cairn-stop-scrolling/id6771791772)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cairn Pro Monthly | $4.99 | per month |
| Cairn Pro Yearly | $29.99 | per year |
| Cairn Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is OnDevice AI free?

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

### Is Cairn free?

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

### Do OnDevice AI or Cairn have ads?

Neither OnDevice AI nor Cairn shows ads.

### Which is updated more often, OnDevice AI or Cairn?

OnDevice AI ships an update every 6 months, and Cairn every 2 days. Most recently, OnDevice AI was updated on October 30, 2026 and Cairn 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.*