# Cat Letter vs Dopamo

The clearest difference is in-app purchases: Cat Letter at none against Dopamo's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Dopamo sells 2 one-off in-app purchases. Cat Letter asks for nothing beyond the download.

Cat Letter ships an update every 4 days, Dopamo every 3 days. The most recent releases landed on October 8, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Cat Letter | Dopamo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 8 MB | 41 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LONG VOYAGE TECHNOLOGIES PTE. LTD.](https://appshunter.io/developer/1896372290) | [Simon Gobes](https://appshunter.io/developer/6790823891) |

## What reviewers say

### Cat Letter

[App page](https://appshunter.io/ios/app/cat-letter/id6773315989)

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

**In-app purchases:** none


### Dopamo

[App page](https://appshunter.io/ios/app/dopamo/id6790830421)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra Family Member | $0.99 | one-time |
| Streak Restore | $0.99 | one-time |


## Frequently asked questions

### Is Cat Letter free?

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

### Is Dopamo free?

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

### Do Cat Letter or Dopamo have ads?

Neither Cat Letter nor Dopamo shows ads.

### Which is updated more often, Cat Letter or Dopamo?

Cat Letter ships an update every 4 days, and Dopamo every 3 days. Most recently, Cat Letter was updated on October 8, 2026 and Dopamo on October 3, 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.*