# SunDose! vs SunSync

The clearest difference is update cadence: SunDose! at every 4 days against SunSync's every 3 weeks. SunDose! also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. SunDose! sells 3 in-app purchases, starting at $2.99 per month and SunSync sells 2 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

SunDose! ships an update every 4 days, SunSync every 3 weeks. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SunDose! | SunSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/sundose/id6742912257/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 37 MB | 25 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Prispa Solutions LLC](https://appshunter.io/developer/1800557753) | [Marta Rodriguez](https://appshunter.io/developer/1873973295) |

## What reviewers say

### SunDose!

[App page](https://appshunter.io/ios/app/sundose/id6742912257)

This app helps you establish a consistent morning sunlight habit to improve sleep, mood, and energy. It offers personalized goals, streak tracking, and educational content, with premium features for advanced health metrics and AI insights.

**Highlights:** Personalized daily sunlight goals, Streak tracking for consistency, Detailed progress visualization, Educational content on sunlight benefits, Reminders for habit maintenance, Vitamin D and sleep optimization tracking

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access | $2.99 | per month |
| Unlimited access | $29.99 | per year |
| Unlimited access | $69.99 | one-time |


### 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 |


## Frequently asked questions

### Is SunDose! free?

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

### Is SunSync free?

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

### Do SunDose! or SunSync have ads?

Neither SunDose! nor SunSync shows ads.

### Which is updated more often, SunDose! or SunSync?

SunDose! ships an update every 4 days, and SunSync every 3 weeks. Most recently, SunDose! was updated on October 7, 2026 and SunSync on October 24, 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.*