# Moonphase Setter vs Ratekeeper

The clearest difference is ads: Ratekeeper at none against Moonphase Setter's shown. Ratekeeper also leads on update cadence (every 3 days vs every 3 weeks). Moonphase Setter's advantage is iOS requirement (16.6 vs 26.5). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Moonphase Setter sells 2 in-app purchases, starting at $2.99 per month and Ratekeeper sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Moonphase Setter ships an update every 3 weeks, Ratekeeper every 3 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Moonphase Setter | Ratekeeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ratekeeper-watch-accuracy/id6792385277/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | — | Free |
| Size | 68 MB | 7 MB |
| Requires iOS | **16.6** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WOORAM YANG](https://appshunter.io/developer/1883501219) | [Slow Sunday Software LLC](https://appshunter.io/developer/6786411203) |

## What reviewers say

### Moonphase Setter

[App page](https://appshunter.io/ios/app/moonphase-setter-watch-sync/id6760901351)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly Membership | $2.99 | per month |
| Premium Yearly Membership | $9.99 | per year |


### Ratekeeper

[App page](https://appshunter.io/ios/app/ratekeeper-watch-accuracy/id6792385277)

Measure the daily accuracy of your mechanical watch without specialized equipment. Simply tap when your watch's second hand aligns with true time, and the app calculates its rate. Track historical data, compare against specifications, and analyze performance by resting position.

**Highlights:** Measures watch rate in seconds per day, Historical data tracking and charting, Comparison against specified accuracy bands, Analysis of rate by resting position, Standalone true-time reference clock, Export readings to CSV

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock the entire app | $4.99 | one-time |


## Frequently asked questions

### Is Moonphase Setter free?

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

### Is Ratekeeper free?

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

### Do Moonphase Setter or Ratekeeper have ads?

Moonphase Setter shows ads; Ratekeeper does not.

### Which is updated more often, Moonphase Setter or Ratekeeper?

Moonphase Setter ships an update every 3 weeks, and Ratekeeper every 3 days. Most recently, Moonphase Setter was updated on November 5, 2026 and Ratekeeper on October 31, 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.*