# Kairos vs 饮水助手

The clearest difference is price: Kairos at Free against 饮水助手's $0.99. Kairos also leads on update cadence (every 6 days vs every 2 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Kairos is free to download; 饮水助手 costs $0.99 up front. Kairos sells 3 in-app purchases, starting at $4.99 per month and 饮水助手 sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Kairos ships an update every 6 days, 饮水助手 every 2 weeks. The most recent releases landed on October 19, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Kairos | 饮水助手 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Size | 105 MB | 3 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HonestyVision](https://appshunter.io/developer/1804536258) | [wenxin hu](https://appshunter.io/developer/1896487832) |

## What reviewers say

### Kairos

[App page](https://appshunter.io/ios/app/kairos-interval-timer/id6743784042)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro subscription monthly | $4.99 | per month |
| Pro subscription annually | $24.99 | per year |
| Lifetime Pro subscription | $19.99 | one-time |


### 饮水助手

[App page](https://appshunter.io/ios/app/and/id6743827923)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $1.99 | per month |
| 年会员 | $9.99 | per year |


## Frequently asked questions

### Is Kairos free?

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

### Is 饮水助手 free?

饮水助手 costs $0.99, and also offers in-app purchases.

### Do Kairos or 饮水助手 have ads?

Neither Kairos nor 饮水助手 shows ads.

### Which is updated more often, Kairos or 饮水助手?

Kairos ships an update every 6 days, and 饮水助手 every 2 weeks. Most recently, Kairos was updated on October 19, 2026 and 饮水助手 on October 28, 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.*