# Retime vs 相対性理論計

The clearest difference is in-app purchases: 相対性理論計 at none against Retime's 3. 相対性理論計 also leads on ads (none vs shown) and update cadence (daily vs every 5 days). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Retime sells 3 in-app purchases, starting at $1.99 per month. 相対性理論計 asks for nothing beyond the download.

Retime ships an update every 5 days, 相対性理論計 daily. The most recent releases landed on October 23, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Retime | 相対性理論計 |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 30 MB | 8 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Iida](https://appshunter.io/developer/1506522991) | [TAKEHITO AWASHIMA](https://appshunter.io/developer/1886038610) |

## What reviewers say

### 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 | $14.99 | per year |
| リタイム PRO 1年間 キャンペーン | $19.99 | per year |


### 相対性理論計

[App page](https://appshunter.io/ios/app/id6804165772)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Retime free?

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

### Is 相対性理論計 free?

相対性理論計 is free to download, with no in-app purchases.

### Do Retime or 相対性理論計 have ads?

Retime shows ads; 相対性理論計 does not.

### Which is updated more often, Retime or 相対性理論計?

Retime ships an update every 5 days, and 相対性理論計 daily. Most recently, Retime was updated on October 23, 2026 and 相対性理論計 on October 13, 2026.

---

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