# ISS River Catalog vs KlarBrief

The clearest difference is in-app purchases: ISS River Catalog at none against KlarBrief's 5. ISS River Catalog also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.6). On price, update cadence and ads there is nothing between them.

Both are free to download. KlarBrief sells 5 in-app purchases, starting at $2.99 per month. ISS River Catalog asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ISS River Catalog | KlarBrief |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 19 MB | 11 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [INOSYS GmbH Innovative Computersysteme](https://appshunter.io/developer/1438879626) | [Maximilian Graf von Korff](https://appshunter.io/developer/1874647045) |

## What reviewers say

### ISS River Catalog

[App page](https://appshunter.io/ios/app/iss-river-catalog/id1456742750)

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

**In-app purchases:** none


### KlarBrief

[App page](https://appshunter.io/ios/app/klarbrief/id6759174297)

**Features:** Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KlarBrief Starter | $2.99 | per month |
| KlarBrief Pro | $3.99 | per month |
| KlarBrief Starter (Yearly) | $24.99 | per year |
| KlarBrief Pro (Yearly) | $39.90 | per year |
| Full Version | $149.99 | one-time |


## Frequently asked questions

### Is ISS River Catalog free?

ISS River Catalog is free to download, with no in-app purchases.

### Is KlarBrief free?

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

### Do ISS River Catalog or KlarBrief have ads?

Neither ISS River Catalog nor KlarBrief shows ads.

### Which is updated more often, ISS River Catalog or KlarBrief?

ISS River Catalog ships an update every 2 months, and KlarBrief every 2 months. Most recently, ISS River Catalog was updated on November 2, 2026 and KlarBrief on October 25, 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.*