# Study Planner 21 vs Retime

The clearest difference is in-app purchases: Study Planner 21 at none against Retime's 3. Study Planner 21 also leads on iOS requirement (13.6 vs 17.0). Retime's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Retime sells 3 in-app purchases, starting at $1.99 per month. Study Planner 21 asks for nothing beyond the download.

Study Planner 21 ships an update every 3 weeks, Retime every 5 days. The most recent releases landed on September 13, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Study Planner 21 | Retime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/retime-study-timer-and-planner/id6736560691/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 72.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 30 MB |
| Requires iOS | **13.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) | [Ryo Iida](https://appshunter.io/developer/1506522991) |

## What reviewers say

### Study Planner 21

[App page](https://appshunter.io/ios/app/study-planner-21/id1622049063)

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

**In-app purchases:** none


### Retime

[App page](https://appshunter.io/ios/app/retime-study-timer-and-planner/id6736560691)

This app helps serious learners manage their study time and track progress. It combines a timer, task management, and analytics to visualize daily efforts and ensure goals are met. Features include goal setting, exam countdowns, and app blocking to enhance focus.

**Highlights:** Unified task management and timer, Study goal progress tracking, Exam countdown and score tracking, Distracting app blocking, Pomodoro and count-up timer modes, Study time visualization, Customizable subjects and themes

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| リタイム PRO 1ヶ月 | $1.99 | per month |
| リタイム PRO 1年間 キャンペーン | $19.99 | per year |
| リタイム PRO 1年間 | $19.99 | per year |


## Frequently asked questions

### Is Study Planner 21 free?

Study Planner 21 is free to download, with no in-app purchases.

### Is Retime free?

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

### Do Study Planner 21 or Retime have ads?

Both Study Planner 21 and Retime show ads.

### Which is updated more often, Study Planner 21 or Retime?

Study Planner 21 ships an update every 3 weeks, and Retime every 5 days. Most recently, Study Planner 21 was updated on September 13, 2026 and Retime on September 23, 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.*