# UOIN vs SunAlly

The clearest difference is update cadence: SunAlly at weekly against UOIN's every 3 weeks. UOIN's advantage is iOS requirement (14.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. UOIN sells 2 in-app purchases, starting at $4.49 per month and SunAlly sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UOIN ships an update every 3 weeks, SunAlly weekly. The most recent releases landed on September 29, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | UOIN | SunAlly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (9 ratings)](https://appshunter.io/ios/app/sunally/id6740318671/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | — | Freemium |
| Size | 120 MB | 58 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Aiyou Digital Intelligence Co., Ltd.](https://appshunter.io/developer/1590480226) | [Hangzhou Freedom Note Artificial Intelligence Technology Co., Ltd](https://appshunter.io/developer/1705653748) |

## What reviewers say

### UOIN

[App page](https://appshunter.io/ios/app/uoin/id1590480224)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 哑铃课程VIP | $4.49 | per month |
| 哑铃课程VIP 高能燃脂健身 | $3.99 | one-time |


### SunAlly

[App page](https://appshunter.io/ios/app/sunally/id6740318671)

This app helps you optimize your time outdoors for health benefits like vitamin D synthesis and improved well-being. It provides personalized recommendations, real-time UV monitoring, and smart reminders for safe and beneficial sun exposure.

**Highlights:** Optimal outdoor activity time recommendations, Real-time UV level monitoring, Smart UV risk prevention reminders, Vitamin D synthesis estimation, Personalized health recommendations, Apple Health integration, HRV stress monitoring

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium SunAlly HRV Monthly | $4.99 | per month |
| Premium SunAlly HRV Yearly | $19.99 | per year |
| Premium SunAlly HRV Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is UOIN free?

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

### Is SunAlly free?

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

### Do UOIN or SunAlly have ads?

Neither UOIN nor SunAlly shows ads.

### Which is updated more often, UOIN or SunAlly?

UOIN ships an update every 3 weeks, and SunAlly weekly. Most recently, UOIN was updated on September 29, 2026 and SunAlly on September 17, 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.*