# SunSync vs 体重日记

The clearest difference is price: SunSync at Free against 体重日记's $0.99. 体重日记's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement there is nothing between them.

SunSync is free to download; 体重日记 costs $0.99 up front. SunSync sells 2 in-app purchases, starting at $1.99 per year. 体重日记 asks for nothing beyond the download.

SunSync ships an update every 3 weeks, 体重日记 fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | SunSync | 体重日记 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 25 MB | 12 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Marta Rodriguez](https://appshunter.io/developer/1873973295) | [创宏 陈](https://appshunter.io/developer/1884920634) |

## 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 |


### 体重日记

[App page](https://appshunter.io/ios/app/id6762725091)

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

**In-app purchases:** none


## Frequently asked questions

### Is SunSync free?

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

### Is 体重日记 free?

体重日记 costs $0.99, with no in-app purchases.

### Do SunSync or 体重日记 have ads?

Neither SunSync nor 体重日记 shows ads.

### Which is updated more often, SunSync or 体重日记?

SunSync ships an update every 3 weeks, and 体重日记 fortnightly. Most recently, SunSync was updated on October 25, 2026 and 体重日记 on October 25, 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.*