# Syncly vs ERTH

The clearest difference is in-app purchases: ERTH at none against Syncly's 1. ERTH also leads on update cadence (every 10 days vs every 5 weeks) and iOS requirement (15.0.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Syncly sells 1 one-off in-app purchase. ERTH asks for nothing beyond the download.

Syncly ships an update every 5 weeks, ERTH every 10 days. The most recent releases landed on September 28, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Syncly | ERTH |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Size | 5 MB | 71 MB |
| Requires iOS | 17.6 | **15.0.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [发亮 刘](https://appshunter.io/developer/1830179467) | [Hyun Seok Kim](https://appshunter.io/developer/1657957306) |

## What reviewers say

### Syncly

[App page](https://appshunter.io/ios/app/syncly-chronotype-energy-quiz/id6760605207)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Lifetime | $3.99 | one-time |


### ERTH

[App page](https://appshunter.io/ios/app/erth/id6770147607)

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

**In-app purchases:** none


## Frequently asked questions

### Is Syncly free?

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

### Is ERTH free?

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

### Do Syncly or ERTH have ads?

Neither Syncly nor ERTH shows ads.

### Which is updated more often, Syncly or ERTH?

Syncly ships an update every 5 weeks, and ERTH every 10 days. Most recently, Syncly was updated on September 28, 2026 and ERTH on October 12, 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.*