# 钦天 vs 知几Kairos

钦天 and 知几Kairos are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

钦天 ships an update every 2 weeks, 知几Kairos fortnightly. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 钦天 | 知几Kairos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/id1619353073/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Size | 54 MB | 11 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [金标 李](https://appshunter.io/developer/1059170129) | [algormula Pte. Ltd.](https://appshunter.io/developer/1828508832) |

## What reviewers say

### 钦天

[App page](https://appshunter.io/ios/app/id1619353073)

**In-app purchases:** none


### 知几Kairos

[App page](https://appshunter.io/ios/app/kairos/id6758753321)

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

**In-app purchases:** none


## Frequently asked questions

### Is 钦天 free?

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

### Is 知几Kairos free?

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

### Do 钦天 or 知几Kairos have ads?

Neither 钦天 nor 知几Kairos shows ads.

### Which is updated more often, 钦天 or 知几Kairos?

钦天 ships an update every 2 weeks, and 知几Kairos fortnightly. Most recently, 钦天 was updated on October 15, 2026 and 知几Kairos on October 9, 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.*