# Horology vs Clavis

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

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

Horology ships an update fortnightly, Clavis every 4 days. The most recent releases landed on November 5, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Horology | Clavis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/horology-keeping-time/id6746370188/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | — |
| Size | 1 MB | 43 MB |
| Requires iOS | 18.4 | **17.2** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Interactive Applications LLC](https://appshunter.io/developer/951504132) | [Pedro Henrique Oliveira Sousa](https://appshunter.io/developer/1875393541) |

## What reviewers say

### Horology

[App page](https://appshunter.io/ios/app/horology-keeping-time/id6746370188)

A minimalist utility app for watch enthusiasts to precisely set mechanical timepieces. It offers advanced features like planetary animations and lunar phase tracking.

**Highlights:** Precise mechanical watch setting, Orbit-based planetary animations, Lunar phase tracking, Minimalist interface, Timekeeping utility

**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 Horology free?

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

### Is Clavis free?

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

### Do Horology or Clavis have ads?

Neither Horology nor Clavis shows ads.

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

Horology ships an update fortnightly, and Clavis every 4 days. Most recently, Horology was updated on November 5, 2026 and Clavis on November 13, 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.*