# Mersea  メルシー vs Rhythm

The clearest difference is price: Mersea  メルシー at Free against Rhythm's $0.99. Mersea  メルシー also leads on update cadence (every 6 weeks vs every 20 months) and iOS requirement (11.0 vs 13.0). On ads, in-app purchases and device support there is nothing between them.

Mersea  メルシー is free to download; Rhythm costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Mersea  メルシー ships an update every 6 weeks, Rhythm every 20 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Mersea  メルシー | Rhythm |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 28.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 20 months |
| Monetization | Free | — |
| Size | 89 MB | 2 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Womens Kampo Inc.](https://appshunter.io/developer/1220678073) | [Masanori Katsuta](https://appshunter.io/developer/320172788) |

## What reviewers say

### Mersea  メルシー

[App page](https://appshunter.io/ios/app/mersea/id1220678074)

This app offers personalized advice for creating a body more conducive to pregnancy, based on individual constitution. It provides support for the physical and emotional anxieties of those trying to conceive, with guidance on diet, exercise, sleep, and mental well-being.

**Highlights:** Personalized constitution analysis, Pregnancy-ready body advice, Diet, exercise, sleep, and mental care tips, Basal body temperature tracking, HealthKit integration for temperature data

**Features:** macOS Compatibility

**In-app purchases:** none


### Rhythm

[App page](https://appshunter.io/ios/app/rhythm-runner/id1638048035)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mersea  メルシー free?

Mersea  メルシー is free to download, with no in-app purchases.

### Is Rhythm free?

Rhythm costs $0.99, with no in-app purchases.

### Do Mersea  メルシー or Rhythm have ads?

Neither Mersea  メルシー nor Rhythm shows ads.

### Which is updated more often, Mersea  メルシー or Rhythm?

Mersea  メルシー ships an update every 6 weeks, and Rhythm every 20 months. Most recently, Mersea  メルシー was updated on November 6, 2026 and Rhythm on November 7, 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.*