# RLX vs StudyKey

The clearest difference is in-app purchases: RLX at none against StudyKey's 2. RLX also leads on update cadence (every 4 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. StudyKey sells 2 in-app purchases, starting at $4.99 per 7 days. RLX asks for nothing beyond the download.

RLX ships an update every 4 days, StudyKey every 9 days. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | RLX | StudyKey |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 9 days |
| Size | 165 MB | 16 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Jan Litjens](https://appshunter.io/developer/1886790215) | [BERAT ONER](https://appshunter.io/developer/6783454346) |

## What reviewers say

### RLX

[App page](https://appshunter.io/ios/app/rlx-digital-detox/id6777478169)

**Features:** macOS Compatibility

**In-app purchases:** none


### StudyKey

[App page](https://appshunter.io/ios/app/studykey-learn-and-focus/id6791251481)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is RLX free?

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

### Is StudyKey free?

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

### Do RLX or StudyKey have ads?

Neither RLX nor StudyKey shows ads.

### Which is updated more often, RLX or StudyKey?

RLX ships an update every 4 days, and StudyKey every 9 days. Most recently, RLX was updated on October 31, 2026 and StudyKey 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.*