# isi vs CatchMate

The clearest difference is in-app purchases: isi at none against CatchMate's 2. CatchMate's advantage is update cadence (weekly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

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

isi ships an update every 3 months, CatchMate weekly. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | isi | CatchMate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Size | 13 MB | 105 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [it-werke](https://appshunter.io/developer/568837445) | [Kenneth Lauer](https://appshunter.io/developer/1896768684) |

## What reviewers say

### isi

[App page](https://appshunter.io/ios/app/isifish/id1346623392)

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

**In-app purchases:** none


### CatchMate

[App page](https://appshunter.io/ios/app/catchmate/id6771011013)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CatchMate Pro Monthly | $3.99 | per month |
| CatchMate Pro Yearly | $34.99 | per year |


## Frequently asked questions

### Is isi free?

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

### Is CatchMate free?

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

### Do isi or CatchMate have ads?

Neither isi nor CatchMate shows ads.

### Which is updated more often, isi or CatchMate?

isi ships an update every 3 months, and CatchMate weekly. Most recently, isi was updated on October 29, 2026 and CatchMate on October 24, 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.*