# Study Key vs Luna

The clearest difference is update cadence: Luna at every 11 days against Study Key's every 3 weeks. 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.

Study Key ships an update every 3 weeks, Luna every 11 days. The most recent releases landed on September 9, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | Study Key | Luna |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Size | 20 MB | 10 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LEAN TRANSITION SOLUTIONS LIMITED](https://appshunter.io/developer/1071218576) | [Booost Education Ltd](https://appshunter.io/developer/1590528202) |

## What reviewers say

### Study Key

[App page](https://appshunter.io/ios/app/study-key/id1634610509)

**Features:** macOS Compatibility

**In-app purchases:** none


### Luna

[App page](https://appshunter.io/ios/app/luna-simplify-revision/id6739215558)

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

**In-app purchases:** none


## Frequently asked questions

### Is Study Key free?

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

### Is Luna free?

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

### Do Study Key or Luna have ads?

Neither Study Key nor Luna shows ads.

### Which is updated more often, Study Key or Luna?

Study Key ships an update every 3 weeks, and Luna every 11 days. Most recently, Study Key was updated on September 9, 2026 and Luna on August 13, 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.*