# 清赤+ vs Linggen

The clearest difference is in-app purchases: 清赤+ at none against Linggen's 3. 清赤+ also leads on iOS requirement (12.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

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

清赤+ ships an update every 2 months, Linggen every 3 weeks. The most recent releases landed on September 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | 清赤+ | Linggen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/linggen-pomodoro-focus-timer/id6761411044/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 45 MB | 57 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aiqiu Sun](https://appshunter.io/developer/1125242690) | [德博 闫](https://appshunter.io/developer/1869645907) |

## What reviewers say

### 清赤+

[App page](https://appshunter.io/ios/app/plus/id1612786633)

**Features:** macOS Compatibility

**In-app purchases:** none


### Linggen

[App page](https://appshunter.io/ios/app/linggen-pomodoro-focus-timer/id6761411044)

This app uses a unique cultivation system to gamify focus sessions and habit building. Track your progress, earn rewards, and gain insights to make focusing a rewarding journey of visible growth.

**Highlights:** Pomodoro focus timer, Custom session length, Distraction-free experience, Visual progress tracking, Rewards system, Focus time statistics

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prime (Monthly) | $1.99 | per month |
| Prime | $9.99 | per year |
| Prime(lifetime) | $29.99 | one-time |


## Frequently asked questions

### Is 清赤+ free?

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

### Is Linggen free?

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

### Do 清赤+ or Linggen have ads?

Neither 清赤+ nor Linggen shows ads.

### Which is updated more often, 清赤+ or Linggen?

清赤+ ships an update every 2 months, and Linggen every 3 weeks. Most recently, 清赤+ was updated on September 9, 2026 and Linggen 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.*