# Sauna Journal vs Sub20

The clearest difference is in-app purchases: Sauna Journal at none against Sub20's 1. Sub20's advantage is update cadence (every 3 days vs weekly) and device support (4 vs 1). On price and ads there is nothing between them.

Both are free to download. Sub20 sells 1 in-app purchase, starting at $24.99 per month. Sauna Journal asks for nothing beyond the download.

Sauna Journal ships an update weekly, Sub20 every 3 days. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Sauna Journal | Sub20 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sauna-journal/id6479173240/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free | — |
| Size | 2 MB | 10 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Nucleon AS](https://appshunter.io/developer/1439780833) | [Chris Edgar](https://appshunter.io/developer/6775813655) |

## What reviewers say

### Sauna Journal

[App page](https://appshunter.io/ios/app/sauna-journal/id6479173240)

Easily record sauna session details like duration, temperature, and hydration. Understand how regular sauna use improves your well-being, stress levels, and recovery. Offers real-time hydration feedback for safer, more beneficial sessions.

**Highlights:** Record session length, Track temperature, Monitor hydration levels, View health enhancement insights, Real-time hydration feedback, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### Sub20

[App page](https://appshunter.io/ios/app/sub20-5k-running-coach/id6775813653)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sub20 Monthly | $24.99 | per month |


## Frequently asked questions

### Is Sauna Journal free?

Sauna Journal is free to download, with no in-app purchases.

### Is Sub20 free?

Sub20 is free to download, with in-app purchases available.

### Do Sauna Journal or Sub20 have ads?

Neither Sauna Journal nor Sub20 shows ads.

### Which is updated more often, Sauna Journal or Sub20?

Sauna Journal ships an update weekly, and Sub20 every 3 days. Most recently, Sauna Journal was updated on October 7, 2026 and Sub20 on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*