# Sauna Assistant vs SolGlow

The clearest difference is price: SolGlow at Free against Sauna Assistant's $19.99. Sauna Assistant's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement there is nothing between them.

SolGlow is free to download; Sauna Assistant costs $19.99 up front. SolGlow sells 2 in-app purchases, starting at $9.99 per year. Sauna Assistant asks for nothing beyond the download.

Sauna Assistant ships an update every 3 weeks, SolGlow every 10 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sauna Assistant | SolGlow |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 390 MB | 10 MB |
| Requires iOS | **17.0** | 17.2 |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [DAINIUS SERPLIS](https://appshunter.io/developer/1801676293) | [Michael Smith](https://appshunter.io/developer/1893971383) |

## What reviewers say

### Sauna Assistant

[App page](https://appshunter.io/ios/app/sauna-assistant-ritual-timer/id6743150443)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


### SolGlow

[App page](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252)

This app automatically estimates your daily vitamin D intake based on sunlight exposure, skin type, and location. It provides real-time UV index, burn-safe time remaining, and integrates with Apple Watch for effortless tracking. Features include winter mode, supplement check-ins, and advanced planning tools for Pro users.

**Highlights:** Automatic vitamin D estimation, Live UV index and IU-per-minute rate, Burn-safe time remaining with alerts, Winter Mode for low-sun periods, Supplement check-in, 7-day UV forecast (Pro), Trip Planner for jet lag (Pro)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SolGlow Pro Annual | $9.99 | per year |
| SolGlow Pro | $19.99 | one-time |


## Frequently asked questions

### Is Sauna Assistant free?

Sauna Assistant costs $19.99, with no in-app purchases.

### Is SolGlow free?

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

### Do Sauna Assistant or SolGlow have ads?

Neither Sauna Assistant nor SolGlow shows ads.

### Which is updated more often, Sauna Assistant or SolGlow?

Sauna Assistant ships an update every 3 weeks, and SolGlow every 10 days. Most recently, Sauna Assistant was updated on October 28, 2026 and SolGlow 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.*