# 天朗紫微AR地球仪 vs 知几Kairos

The clearest difference is iOS requirement: 天朗紫微AR地球仪 at 11.0 against 知几Kairos's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

天朗紫微AR地球仪 ships an update monthly, 知几Kairos fortnightly. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 天朗紫微AR地球仪 | 知几Kairos |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Size | 1.7 GB | 2 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [秀红 于](https://appshunter.io/developer/1449441031) | [algormula Pte. Ltd.](https://appshunter.io/developer/1828508832) |

## What reviewers say

### 天朗紫微AR地球仪

[App page](https://appshunter.io/ios/app/ar/id1547214265)

**Features:** macOS Compatibility

**In-app purchases:** none


### 知几Kairos

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 天朗紫微AR地球仪 free?

天朗紫微AR地球仪 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 天朗紫微AR地球仪 or 知几Kairos have ads?

Neither 天朗紫微AR地球仪 nor 知几Kairos shows ads.

### Which is updated more often, 天朗紫微AR地球仪 or 知几Kairos?

天朗紫微AR地球仪 ships an update monthly, and 知几Kairos fortnightly. Most recently, 天朗紫微AR地球仪 was updated on September 24, 2026 and 知几Kairos on September 22, 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.*