# Sky3 vs Clavis

The clearest difference is in-app purchases: Sky3 at none against Clavis's 5. Sky3 also leads on iOS requirement (15.0 vs 17.2). Clavis's advantage is update cadence (every 4 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Clavis sells 5 in-app purchases, starting at $4.99 per month. Sky3 asks for nothing beyond the download.

Sky3 ships an update monthly, Clavis every 4 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | Sky3 | Clavis |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 61 MB | 43 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Jersey Central Management LLC](https://appshunter.io/developer/1220234976) | [Pedro Henrique Oliveira Sousa](https://appshunter.io/developer/1875393541) |

## What reviewers say

### Sky3

[App page](https://appshunter.io/ios/app/sky3/id6746869172)

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

**In-app purchases:** none


### Clavis

[App page](https://appshunter.io/ios/app/clavis-planetary-clock/id6758866461)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clavis AI Monthly | $4.99 | per month |
| Clavis AI Yearly | $29.99 | per year |
| Tip | $1.99 | one-time |
| Support + 30 days of AI | $5.99 | one-time |
| Support + 90 days of AI | $14.99 | one-time |


## Frequently asked questions

### Is Sky3 free?

Sky3 is free to download, with no in-app purchases.

### Is Clavis free?

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

### Do Sky3 or Clavis have ads?

Neither Sky3 nor Clavis shows ads.

### Which is updated more often, Sky3 or Clavis?

Sky3 ships an update monthly, and Clavis every 4 days. Most recently, Sky3 was updated on November 5, 2026 and Clavis on November 5, 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.*