# ChronoRate vs Doupin

The clearest difference is in-app purchases: Doupin at none against ChronoRate's 1. Doupin also leads on update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ChronoRate sells 1 one-off in-app purchase. Doupin asks for nothing beyond the download.

ChronoRate ships an update every 3 weeks, Doupin every 2 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | ChronoRate | Doupin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 7 MB | 81 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Chieh Chung Tsou](https://appshunter.io/developer/1884205861) | [Shenzhen monokaro Technology CO., LTD](https://appshunter.io/developer/1894804963) |

## What reviewers say

### ChronoRate

[App page](https://appshunter.io/ios/app/chronorate/id6760379687)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $7.99 | one-time |


### Doupin

[App page](https://appshunter.io/ios/app/doupin/id6803451898)

**In-app purchases:** none


## Frequently asked questions

### Is ChronoRate free?

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

### Is Doupin free?

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

### Do ChronoRate or Doupin have ads?

Neither ChronoRate nor Doupin shows ads.

### Which is updated more often, ChronoRate or Doupin?

ChronoRate ships an update every 3 weeks, and Doupin every 2 days. Most recently, ChronoRate was updated on October 31, 2026 and Doupin on October 31, 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.*