# ReadingRookie vs TheLostKOSM

The clearest difference is update cadence: TheLostKOSM at weekly against ReadingRookie's every 6 months. ReadingRookie's advantage is iOS requirement (12.2 vs 15.6). 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.

ReadingRookie ships an update every 6 months, TheLostKOSM weekly. The most recent releases landed on December 15, 2025 and October 24, 2026 respectively.

## The numbers

| Metric | ReadingRookie | TheLostKOSM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Size | 1 MB | 173 MB |
| Requires iOS | **12.2** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Epublic CO.,LTD](https://appshunter.io/developer/1171279840) | [Korea National Ocean Science Museum](https://appshunter.io/developer/1625817672) |

## What reviewers say

### ReadingRookie

[App page](https://appshunter.io/ios/app/readingrookie/id1543673353)

**Features:** macOS Compatibility

**In-app purchases:** none


### TheLostKOSM

[App page](https://appshunter.io/ios/app/thelostkosm/id1626500208)

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

**In-app purchases:** none


## Frequently asked questions

### Is ReadingRookie free?

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

### Is TheLostKOSM free?

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

### Do ReadingRookie or TheLostKOSM have ads?

Neither ReadingRookie nor TheLostKOSM shows ads.

### Which is updated more often, ReadingRookie or TheLostKOSM?

ReadingRookie ships an update every 6 months, and TheLostKOSM weekly. Most recently, ReadingRookie was updated on December 15, 2025 and TheLostKOSM 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.*