# Project Function vs Sol Glow

The clearest difference is update cadence: Sol Glow at every 2 days against Project Function's every 6 weeks. Project Function's advantage is device support (4 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Project Function ships an update every 6 weeks, Sol Glow every 2 days. The most recent releases landed on October 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Project Function | Sol Glow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sol-glow-tanning-timer-and-uv/id6773100774/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | — | Subscription |
| Size | 181 MB | 50 MB |
| Requires iOS | **15.5** | 16.4 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Project Function LLC](https://appshunter.io/developer/1790112444) | [STONEG LLC](https://appshunter.io/developer/1692015581) |

## What reviewers say

### Project Function

[App page](https://appshunter.io/ios/app/project-function/id6740467390)

**Features:** Apple Wallet, Apple Watch app

**In-app purchases:** none


### Sol Glow

[App page](https://appshunter.io/ios/app/sol-glow-tanning-timer-and-uv/id6773100774)

This app helps you plan safe outdoor sun exposure based on live UV index, weather, and your skin type. It provides personalized session lengths, timers with reminders to flip, reapply sunscreen, and hydrate, all while discouraging overexposure.

**Highlights:** Live UV index and weather forecast, Personalized sun exposure session planning, Smart timer with flip and reapply reminders, Hydration nudges, Live Activity and widget support, Session logging and progress tracking, Group session sharing

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

**In-app purchases:** none


## Frequently asked questions

### Is Project Function free?

Project Function is free to download, with no in-app purchases.

### Is Sol Glow free?

Sol Glow is free to download, with no in-app purchases.

### Do Project Function or Sol Glow have ads?

Neither Project Function nor Sol Glow shows ads.

### Which is updated more often, Project Function or Sol Glow?

Project Function ships an update every 6 weeks, and Sol Glow every 2 days. Most recently, Project Function was updated on October 9, 2026 and Sol Glow on September 23, 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.*