# check vs Columbus Eye

The clearest difference is update cadence: check at every 9 days against Columbus Eye's every 2 months. check also leads on iOS requirement (8.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

check ships an update every 9 days, Columbus Eye every 2 months. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | check | Columbus Eye |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 months |
| Monetization | — | Free |
| Size | 23 MB | 213 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Smart Bits GmbH](https://appshunter.io/developer/1218214060) | [Ruhr-Universitaet Bochum](https://appshunter.io/developer/476630475) |

## What reviewers say

### check

[App page](https://appshunter.io/ios/app/check-app-new/id1275901663)

**Features:** macOS Compatibility

**In-app purchases:** none


### Columbus Eye

[App page](https://appshunter.io/ios/app/columbus-eye/id6444104616)

Explore Earth's features like volcanoes and cities in 3D using augmented reality. This educational app uses real satellite data and printable worksheets to bring scientific content to life for learning at home or in the classroom.

**Highlights:** Marker-based Augmented Reality, High-quality satellite imagery, Interactive learning modules, Based on real satellite data, Works with printable worksheets

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

**In-app purchases:** none


## Frequently asked questions

### Is check free?

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

### Is Columbus Eye free?

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

### Do check or Columbus Eye have ads?

Neither check nor Columbus Eye shows ads.

### Which is updated more often, check or Columbus Eye?

check ships an update every 9 days, and Columbus Eye every 2 months. Most recently, check was updated on October 10, 2026 and Columbus Eye on October 6, 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.*