Sauna Journal vs Sub20
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sauna Journal
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.
- Record session length
- Track temperature
- Monitor hydration levels
- View health enhancement insights
- Real-time hydration feedback
- Progress tracking
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Sauna Journal is designed for everyone who loves sauna sessions and wants to maximize their benefits. This app allows you to easily record session lengths, temperatures, and hydration levels, providing a clear view of how regular sauna use enhances your health. Understand the impact of sauna on well-being by tracking your progress and noticing improvements in stress reduction, cardiovascular health, and muscle recovery. Sauna Journal emphasizes the importance of hydration, offering real-time feedback to ensure your sessions are both safe and beneficial.
Sub20
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Sub20 is a structured 5K training system that helps you run a faster, stronger 5K, with a clear path all the way to sub-20 if that's your goal. Enter your current 5K time and Sub20 instantly places you at the right starting point: Level 1 - Foundation: 30:00+ Level 2 - Aerobic Build: 27:00-30:00 Level 3 - Threshold Development: 25:00-27:00 Level 4 - 5K Conversion: 23:00-25:00 Level 5 - Race Specific: 21:00-23:00 Level 6 - Sub-20 Peak: under 21:00 - Personalised training levels that adapt to your current ability - Exact paces for every session, so you always know how hard to push - Benchmark tests that track real progress toward your goal time and adjust your training plan if needed - Apple Watch sync - see your session and paces on your wrist, mid-run - Simple, structured weekly plans - no guesswork, no overtraining Download Sub20 and start your next session today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sauna Journal | Sub20 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Nucleon AS | Chris Edgar |
In-app purchases
Sauna Journal
No in-app purchases
Sub20
- Sub20 Monthly7 Days trial$24.991 Month









