# ISS River Catalog vs TimeTac

The clearest difference is update cadence: TimeTac at monthly against ISS River Catalog's every 2 months. ISS River Catalog's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ISS River Catalog ships an update every 2 months, TimeTac monthly. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ISS River Catalog | TimeTac |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 19 MB | 59 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [INOSYS GmbH Innovative Computersysteme](https://appshunter.io/developer/1438879626) | [TimeTac](https://appshunter.io/developer/609772208) |

## 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


### TimeTac

[App page](https://appshunter.io/ios/app/timetac/id6748440340)

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

**In-app purchases:** none


## Frequently asked questions

### Is ISS River Catalog free?

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

### Is TimeTac free?

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

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

Neither ISS River Catalog nor TimeTac shows ads.

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

ISS River Catalog ships an update every 2 months, and TimeTac monthly. Most recently, ISS River Catalog was updated on November 2, 2026 and TimeTac on November 5, 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.*