# MobilePKI vs Moon Clock

The clearest difference is in-app purchases: MobilePKI at none against Moon Clock's 1. MobilePKI also leads on iOS requirement (8.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Moon Clock sells 1 one-off in-app purchase. MobilePKI asks for nothing beyond the download.

MobilePKI ships an update every 4 weeks, Moon Clock every 6 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MobilePKI | Moon Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 6 weeks |
| Size | 6 MB | 78 MB |
| Requires iOS | **8.1** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Changing Information Technology Inc.](https://appshunter.io/developer/329855504) | [YI-WEN CHOU](https://appshunter.io/developer/6799608432) |

## What reviewers say

### MobilePKI

[App page](https://appshunter.io/ios/app/mobilepki/id529705563)

**In-app purchases:** none


### Moon Clock

[App page](https://appshunter.io/ios/app/moon-clock-phases-and-widgets/id6799608430)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Moon Clock Pro | $5.99 | one-time |


## Frequently asked questions

### Is MobilePKI free?

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

### Is Moon Clock free?

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

### Do MobilePKI or Moon Clock have ads?

Neither MobilePKI nor Moon Clock shows ads.

### Which is updated more often, MobilePKI or Moon Clock?

MobilePKI ships an update every 4 weeks, and Moon Clock every 6 weeks. Most recently, MobilePKI was updated on October 26, 2026 and Moon Clock 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.*