# Probability Sim vs Planetary Hours

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

Probability Sim is free to download; Planetary Hours costs $4.99 up front. Probability Sim sells 2 in-app purchases, starting at $4.99 per month. Planetary Hours asks for nothing beyond the download.

Probability Sim ships an update every 10 months, Planetary Hours monthly. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Probability Sim | 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 | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | — | Paid |
| Size | 29 MB | 16 MB |
| Requires iOS | **15.0** | 17 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kota tada](https://appshunter.io/developer/1658942612) | [雪 蔺](https://appshunter.io/developer/1853712836) |

## What reviewers say

### Probability Sim

[App page](https://appshunter.io/ios/app/probability-sim-trillion/id6743378063)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free for 1 month | $4.99 | per month |
| Ad-free for 1 year | $49.99 | per year |


### 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 Sim free?

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

### Is Planetary Hours free?

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

### Do Probability Sim or Planetary Hours have ads?

Probability Sim shows ads; Planetary Hours does not.

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

Probability Sim ships an update every 10 months, and Planetary Hours monthly. Most recently, Probability Sim was updated on October 30, 2026 and Planetary Hours 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.*