# Synca vs Rhythmus

The clearest difference is in-app purchases: Rhythmus at none against Synca's 2. Rhythmus also leads on update cadence (every 3 days vs every 2 weeks) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Synca sells 2 in-app purchases, starting at $4.99 per month. Rhythmus asks for nothing beyond the download.

Synca ships an update every 2 weeks, Rhythmus every 3 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Synca | Rhythmus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/synca-ai-cycle-syncing/id6758351599/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Subscription | — |
| Size | 25 MB | 21 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Burcu Ibicioglu](https://appshunter.io/developer/1872466864) | [Patrick Sarpen](https://appshunter.io/developer/6804829454) |

## What reviewers say

### Synca

[App page](https://appshunter.io/ios/app/synca-ai-cycle-syncing/id6758351599)

This app uses AI to help you plan your daily tasks and activities around your menstrual cycle. It provides personalized insights and suggestions for energy, focus, and mood based on your current cycle phase. Optimize your productivity and well-being by working with your body's natural rhythms.

**Highlights:** AI-powered cycle-aware task planning, Personalized daily insights based on cycle phase, Four cycle phases with identified strengths, Smart calendar with energy-based event tagging, Quick daily mood and energy tracking, Phase-matched workout and meal suggestions, Private data storage on device

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synca AI | $4.99 | per month |
| Synca AI | $24.99 | per year |


### Rhythmus

[App page](https://appshunter.io/ios/app/rhythmus-cycle-syncing/id6804829452)

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

**In-app purchases:** none


## Frequently asked questions

### Is Synca free?

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

### Is Rhythmus free?

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

### Do Synca or Rhythmus have ads?

Neither Synca nor Rhythmus shows ads.

### Which is updated more often, Synca or Rhythmus?

Synca ships an update every 2 weeks, and Rhythmus every 3 days. Most recently, Synca was updated on October 31, 2026 and Rhythmus on November 6, 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.*