# ReBrain: Flashcards app — Smart words study

> Smart words study (iPhone/iPad app by ryota hatazawa.)

- Source: https://appshunter.io/ios/app/rebrain-flashcards-app/id6742406188 (this page in markdown: same URL + `.md`)
- Developer: [ryota hatazawa](https://appshunter.io/developer/1765243887)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.2 · 64 MB
- Languages: American English, Japanese
- Released: 2025-03-25
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/rebrain-flashcards-app/id6742406188/reviews.md

## What is ReBrain?

ReBrain is a flashcard learning app powered by a spaced repetition algorithm based on the forgetting curve.
Instead of simple repetition, cards are shown at the optimal timing based on how well you remember them—helping you learn efficiently and retain information long-term.

Features
・Multiple study modes: Learn with flashcards, typing, multiple-choice quizzes, and red-sheet mode.
・Quick Search: Instantly look up words with a single tap.
・Smart Study: Review based on the forgetting curve. Cards you struggle with appear more frequently, while well-learned cards appear less often.
・Custom themes (Pro): Personalize the app with different colors, fonts, and icons.

There are no ads in the app, and all learning-related features are completely free.
Additional customization options require a purchase.

For more details, please visit our website.

Site: https://rebrainapp.studio.site 
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ 
Privacy Policy: https:// rebrainapp.studio.site/privacypolicy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| ReBrain Pro 年額 | $5.99 | per year |
| ReBrain Pro 月額 | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| ReBrain Pro 買い切り | $9.99 | one-time |



## Version history (last 5 releases)

### 1.3.13 — 2026-08-31

・New Features
Added a focus lock feature that locks other apps until you've studied a specified number of cards.
Added a feature that uses AI to generate answer choices in selection study mode.
Added Mix study support for individual folders.
Added filter and grid view support inside folders.
You can now change the color of folders.

・Bug Fixes
Updated the filter UI for number and accuracy rate filtering.
Filters and sort settings are now saved per set.
Fixed an issue with CSV import.
Relaxed ReBrain AI limits for Pro users.
Changed the behavior of the flip front and back feature.
Other minor fixes.

### 1.3.12 — 2026-08-15

・Fixed
Fixed a bug where the app would suddenly close during study.
You can now choose whether to keep or delete the original set when merging sets.
In swipe study, if the content is long, you can now scroll.
Changed to display more text on cards.
Fixed the voice reading language recognition feature.

### 1.3.11 — 2026-07-25

・New Features
In response to your requests, users on the Free plan can now create up to 5 sets.
Updated the sidebar layout on iPad.
Added hardware keyboard support for some parts of the study screen.
The accuracy rate is now displayed on the card number border in the card list.
Users on a paid plan can now change the ReBrain AI model.

・Bug Fixes
Moved the search and sort buttons in the card list to the bottom.
Updated the navigation bar. If you experience any issues, you can revert to the previous style from "Other" in settings.
This version includes various bug fixes and performance optimizations. We've also taken the opportunity to clean up the app's internal code behind the scenes, laying the groundwork for a better experience going forward.
If you notice any new issues, we'd appreciate it if you could contact us via the in-app settings.

### 1.3.10 — 2026-07-11

・Bug Fixes
Fixed an issue where the default keyboard would not appear.
You can now study even when there are only a few cards in selection mode.

### 1.3.9 — 2026-07-10

・New Features
Redesigned the library view. You can revert to the previous layout from the customization option at the bottom.
You can now nest folders inside other folders.
You can now reorder sets and folders by dragging.
Deleted items are now moved to "Recently Deleted" and permanently removed after 30 days.
You can now merge sets.
You can now select the text-to-speech voice.

・Bug Fixes
Fixed an issue with sorting by weakest cards.
Fixed a bug where the X toast notification would not disappear.
Other minor fixes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*