# Probability vs Planetary Hours

The clearest difference is price: Probability at Free against Planetary Hours's $4.99. Probability also leads on iOS requirement (9.0 vs 17). Planetary Hours's advantage is update cadence (monthly vs every 18 months). On ads, in-app purchases and device support there is nothing between them.

Probability is free to download; Planetary Hours costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Probability ships an update every 18 months, Planetary Hours monthly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Probability | Planetary Hours |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Monthly** |
| Monetization | — | Paid |
| Size | 1 MB | 16 MB |
| Requires iOS | **9.0** | 17 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [domesticusdevelop](https://appshunter.io/developer/373834594) | [雪 蔺](https://appshunter.io/developer/1853712836) |

## What reviewers say

### Probability

[App page](https://appshunter.io/ios/app/probability-dd/id1451460705)

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Probability free?

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

### Is Planetary Hours free?

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

### Do Probability or Planetary Hours have ads?

Neither Probability nor Planetary Hours shows ads.

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

Probability ships an update every 18 months, and Planetary Hours monthly. Most recently, Probability was updated on October 27, 2026 and Planetary Hours on October 24, 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.*