# Synca vs Caelyn

The clearest difference is monetization model: Caelyn at freemium against Synca's subscription. Caelyn also leads on update cadence (every 2 days vs every 2 weeks) and device support (3 vs 1). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Synca sells 2 in-app purchases, starting at $4.99 per month and Caelyn sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Synca against 5.0 for Caelyn. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Synca ships an update every 2 weeks, Caelyn every 2 days. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Synca | Caelyn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/synca-ai-cycle-syncing/id6758351599/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/caelyn-period-and-cycle-tracker/id6764264949/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Subscription | **Freemium** |
| Size | 25 MB | 10 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Burcu Ibicioglu](https://appshunter.io/developer/1872466864) | [Rajesh Panta](https://appshunter.io/developer/1784818219) |

## 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 |


### Caelyn

[App page](https://appshunter.io/ios/app/caelyn-period-and-cycle-tracker/id6764264949)

This period tracker learns your unique cycle patterns and keeps all your health data private on your device. It offers detailed insights into your cycle, symptoms, and mood, with robust privacy features and an optional Pro version for advanced analytics.

**Highlights:** Personalized cycle learning, Detailed symptom and mood logging, On-device data storage, Privacy-focused design, Cycle pattern insights, Data export (CSV/PDF), Apple Health integration

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Yearly | $19.99 | per year |
| Pro Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Synca free?

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

### Is Caelyn free?

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

### Which has better reviews, Synca or Caelyn?

Synca and Caelyn are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do Synca or Caelyn have ads?

Neither Synca nor Caelyn shows ads.

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

Synca ships an update every 2 weeks, and Caelyn every 2 days. Most recently, Synca was updated on October 15, 2026 and Caelyn on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*