# 彩虹时钟 vs Kitty

The clearest difference is update cadence: Kitty at every 2 weeks against 彩虹时钟's every 2 months. Kitty also leads on iOS requirement (15.6 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 彩虹时钟 sells 2 in-app purchases, starting at $6.99 per year and Kitty sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

彩虹时钟 ships an update every 2 months, Kitty every 2 weeks. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 彩虹时钟 | Kitty |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 86 MB | 96 MB |
| Requires iOS | 18.6 | **15.6** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rainbow Forest Co., Ltd](https://appshunter.io/developer/1739974336) | [odd taxi](https://appshunter.io/developer/1668660946) |

## What reviewers say

### 彩虹时钟

[App page](https://appshunter.io/ios/app/id6482986395)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 彩虹PRO 年度订阅 | $6.99 | per year |
| 永久彩虹PRO 会员 | $14.99 | one-time |


### Kitty

[App page](https://appshunter.io/ios/app/kitty-cat-study-timer/id6757783153)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7天会员 | $0.99 | one-time |
| 月度会员 | $3.99 | one-time |
| 年度会员 | $29.99 | one-time |


## Frequently asked questions

### Is 彩虹时钟 free?

彩虹时钟 is free to download, with in-app purchases available.

### Is Kitty free?

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

### Do 彩虹时钟 or Kitty have ads?

Neither 彩虹时钟 nor Kitty shows ads.

### Which is updated more often, 彩虹时钟 or Kitty?

彩虹时钟 ships an update every 2 months, and Kitty every 2 weeks. Most recently, 彩虹时钟 was updated on October 4, 2026 and Kitty on October 10, 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.*