# SunAlly vs RetinTrack A

SunAlly and RetinTrack A are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. SunAlly sells 3 in-app purchases, starting at $4.99 per month and RetinTrack A sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

SunAlly ships an update weekly, RetinTrack A fortnightly. The most recent releases landed on September 17, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SunAlly | RetinTrack A |
| --- | --- | --- |
| 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 | **Weekly** | Fortnightly |
| Monetization | Freemium | — |
| Size | 58 MB | 1 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Freedom Note Artificial Intelligence Technology Co., Ltd](https://appshunter.io/developer/1705653748) | [瞳灵 胡](https://appshunter.io/developer/6799178471) |

## What reviewers say

### 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 |


### RetinTrack A

[App page](https://appshunter.io/ios/app/retintrack-a/id6804353678)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A+C | $0.99 | per month |
| A+C International | $8.99 | per year |


## Frequently asked questions

### Is SunAlly free?

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

### Is RetinTrack A free?

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

### Do SunAlly or RetinTrack A have ads?

Neither SunAlly nor RetinTrack A shows ads.

### Which is updated more often, SunAlly or RetinTrack A?

SunAlly ships an update weekly, and RetinTrack A fortnightly. Most recently, SunAlly was updated on September 17, 2026 and RetinTrack A on October 10, 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.*