# ReBrain vs Study Penguin

The clearest difference is in-app purchases: Study Penguin at none against ReBrain's 3. Study Penguin also leads on update cadence (daily vs every 10 days) and iOS requirement (15.1 vs 18.2). On price, ads and device support there is nothing between them.

Both are free to download. ReBrain sells 3 in-app purchases, starting at $1.99 per month. Study Penguin asks for nothing beyond the download.

ReBrain ships an update every 10 days, Study Penguin daily. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ReBrain | Study Penguin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | **Daily** |
| Size | 64 MB | 38 MB |
| Requires iOS | 18.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ryota hatazawa](https://appshunter.io/developer/1765243887) | [Rei Minamida](https://appshunter.io/developer/6779070914) |

## What reviewers say

### ReBrain

[App page](https://appshunter.io/ios/app/rebrain-flashcards-app/id6742406188)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReBrain Pro 月額 | $1.99 | per month |
| ReBrain Pro 年額 | $5.99 | per year |
| ReBrain Pro 買い切り | $9.99 | one-time |


### Study Penguin

[App page](https://appshunter.io/ios/app/study-penguin/id6779070912)

**In-app purchases:** none


## Frequently asked questions

### Is ReBrain free?

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

### Is Study Penguin free?

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

### Do ReBrain or Study Penguin have ads?

Neither ReBrain nor Study Penguin shows ads.

### Which is updated more often, ReBrain or Study Penguin?

ReBrain ships an update every 10 days, and Study Penguin daily. Most recently, ReBrain was updated on October 30, 2026 and Study Penguin on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*