# Planetary Hours vs SlimTimer

The clearest difference is price: SlimTimer at Free against Planetary Hours's $4.99. SlimTimer also leads on update cadence (every 9 days vs monthly) and iOS requirement (15.0 vs 17). Planetary Hours's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

SlimTimer is free to download; Planetary Hours costs $4.99 up front. SlimTimer sells 2 one-off in-app purchases. Planetary Hours asks for nothing beyond the download.

Planetary Hours ships an update monthly, SlimTimer every 9 days. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Planetary Hours | SlimTimer |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/planetary-hours-astro-clock/id6757678864/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | Paid | — |
| Size | 16 MB | 8 MB |
| Requires iOS | 17 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [雪 蔺](https://appshunter.io/developer/1853712836) | [Luan Cu Xuan](https://appshunter.io/developer/1892678405) |

## What reviewers say

### Planetary Hours

[App page](https://appshunter.io/ios/app/planetary-hours-astro-clock/id6757678864)

This app provides a dynamic clock that displays planetary hours, adapting to the natural flow of the sun. It offers real-time calculations based on your location and supports various iOS features like Live Activities and Apple Watch complications for at-a-glance timing updates.

**Highlights:** Dynamic Island & Live Activities, Apple Watch Complications, StandBy & Lock Screen Widgets, Interactive Home Screen Widgets, Precision Astronomy Calculations, Offline Processing, Customizable Notifications

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

**In-app purchases:** none


### SlimTimer

[App page](https://appshunter.io/ios/app/slimtimer-quick-countdown/id6763735588)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Remove ads | $1.99 | one-time |


## Frequently asked questions

### Is Planetary Hours free?

Planetary Hours costs $4.99, with no in-app purchases.

### Is SlimTimer free?

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

### Do Planetary Hours or SlimTimer have ads?

Neither Planetary Hours nor SlimTimer shows ads.

### Which is updated more often, Planetary Hours or SlimTimer?

Planetary Hours ships an update monthly, and SlimTimer every 9 days. Most recently, Planetary Hours was updated on October 15, 2026 and SlimTimer on October 1, 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.*