# Mars Rock vs Lunar Timer

The clearest difference is in-app purchases: Mars Rock at none against Lunar Timer's 1. Mars Rock also leads on ads (none vs shown) and iOS requirement (15.5 vs 17.6). Lunar Timer's advantage is update cadence (every 10 days vs monthly). On price and device support there is nothing between them.

Both are free to download. Lunar Timer sells 1 in-app purchase, starting at $1.99 per month. Mars Rock asks for nothing beyond the download.

Mars Rock ships an update monthly, Lunar Timer every 10 days. The most recent releases landed on September 21, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Mars Rock | Lunar Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 10 days** |
| Size | 23 MB | 21 MB |
| Requires iOS | **15.5** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Xiamen Mars Rock Science Technology Co.,Ltd](https://appshunter.io/developer/1787113189) | [ATSUKO MOTOYAMA](https://appshunter.io/developer/1868868796) |

## What reviewers say

### Mars Rock

[App page](https://appshunter.io/ios/app/mars-rock/id6739800801)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lunar Timer

[App page](https://appshunter.io/ios/app/lunar-timer/id6757776396)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $1.99 | per month |


## Frequently asked questions

### Is Mars Rock free?

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

### Is Lunar Timer free?

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

### Do Mars Rock or Lunar Timer have ads?

Lunar Timer shows ads; Mars Rock does not.

### Which is updated more often, Mars Rock or Lunar Timer?

Mars Rock ships an update monthly, and Lunar Timer every 10 days. Most recently, Mars Rock was updated on September 21, 2026 and Lunar Timer on September 30, 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.*