# SunSync vs Circadian Reset

The clearest difference is update cadence: SunSync at every 3 weeks against Circadian Reset's every 3 months. SunSync also leads on iOS requirement (17.6 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SunSync sells 2 in-app purchases, starting at $1.99 per year and Circadian Reset sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

SunSync ships an update every 3 weeks, Circadian Reset every 3 months. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | SunSync | Circadian Reset |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 25 MB | 8 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Marta Rodriguez](https://appshunter.io/developer/1873973295) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### SunSync

[App page](https://appshunter.io/ios/app/sunsync-circadian-tracker/id6762293528)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Year | $1.99 | per year |
| Lifetime | $2.99 | one-time |


### Circadian Reset

[App page](https://appshunter.io/ios/app/circadian-reset-dawn/id6774359537)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dawn Pro | $4.99 | per month |
| Dawn Pro | $39.99 | per year |
| Dawn Pro | $39.99 | per year |


## Frequently asked questions

### Is SunSync free?

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

### Is Circadian Reset free?

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

### Do SunSync or Circadian Reset have ads?

Neither SunSync nor Circadian Reset shows ads.

### Which is updated more often, SunSync or Circadian Reset?

SunSync ships an update every 3 weeks, and Circadian Reset every 3 months. Most recently, SunSync was updated on October 25, 2026 and Circadian Reset on October 20, 2026.

---

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