Sauna Metrics vs CoffeeMeter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sauna Metrics
Track your sauna sessions and gain insights into how heat impacts your sleep, heart rate, and recovery. Monitor your 'heat age' and analyze individual sessions with detailed metrics and photos. Unlock advanced health analyses and personalized recaps with a subscription.
- Session timing and logging
- Heat impact analysis
- Heat age calculation
- Round-by-round timer
- Health analyses
- HRV and resting heart rate trends
- Data export
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Sauna Metrics turns every sauna session into data you can learn from. Time your rounds, log temperature, humidity and how you feel, then see what heat actually does to your sleep, heart rate and recovery. YOUR HEAT AGE • One number for how your body handles heat, from your sessions, resting heart rate, VO2max and sleep • Its pace over the months, and a detail screen that shows what moves it EVERY SESSION • Round-by-round timer with a Live Activity • Temperature, humidity, sauna type, sauna hat and water • Mood and stress before and after, calories and sweat loss • A photo on each session, and an image to share it • A session score that shows what made it a good one KEEP GOING • Streaks and badges • Insights on your history: your sauna day, your best time, your score trend • Export your data whenever you want • Short, sourced reads on heat, hydration, sleep and safety SAUNA METRICS PRO A monthly subscription, or a yearly one with the first week free. • Sauna Metrics on Apple Watch: start a session from your wrist, follow your heart rate live, get an alert if it climbs too high, and a 10-minute recovery countdown • Six Health analyses: sleep, heart and heart rate recovery, body, blood pressure, training and weekly dose, compared between sauna days and rest days • Heart rate zones and recovery for each session, compared with your past sessions • HRV and resting heart rate trends, and your heat resistance • Training log and month against month • Monthly and yearly recaps told as stories • Your Health figures on your share images • Home and Lock Screen widgets Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://saunametrics.app/privacy/ Your sessions and Health data stay on your iPhone. Heart rate is a guide, not a medical measurement. Ask your doctor before using the sauna if you have a heart condition.
CoffeeMeter
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This app helps you use coffee as fuel and prevent it from costing you sleep. Tap one button to log an espresso, matcha, energy drink, or even a Coca-Cola. A real bi-exponential pharmacokinetics model projects how much caffeine you'll likely still have in your bloodstream when you want to be asleep. WORK WITH YOUR NATURAL CORTISOL CoffeeMeter shows your cortisol awakening response, the natural alertness curve that peaks in the first hour after waking. Drinking coffee inside that window can blunt how strongly caffeine hits. CoffeeMeter highlights the window where your first cup tends to land hardest (typically 1.5 to 3.5 hours after wake). SIMULATE BEFORE YOU SIP Thinking about a 4 pm espresso? CoffeeMeter lets you test combinations without committing. See how that hypothetical second coffee changes your bedtime number, then decide. BUILD YOUR HEALTH STORY Every cup syncs to Apple Health. Your data is yours, exportable as CSV any time, ready to share with your doctor or AI assistant. WHAT IS INSIDE - Real-time caffeine gauge with rising indicator - 24-hour rolling caffeine curve with bedtime marker - Sleep-impact projection at your set bedtime - Cortisol-based optimal coffee window - 10 drink types: espresso, big coffee, green tea, matcha, black tea, mate, energy drink, Coca-Cola, chocolate, decaf - What-if simulation for combined doses - Apple Health sync (caffeine intake) - Edit history, adjust bedtime, fine-tune your half-life COFFEEMETER PRO unlocks unlimited logging, unlimited simulations, and CSV export for AI assistants and your own analysis. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Sauna Metrics at weekly against CoffeeMeter's every 3 weeks. CoffeeMeter's advantage is iOS requirement (16.4 vs 26.0). On price, ads, in-app purchases and device support 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. Sauna Metrics sells 2 in-app purchases, starting at $3.99 per month and CoffeeMeter sells 1 in-app purchase, starting at $24.99 per year. Whichever you choose, the download price is not the number that matters.
Sauna Metrics ships an update weekly, CoffeeMeter every 3 weeks. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.
| Parameter | Sauna Metrics | CoffeeMeter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 26.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 38 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | Philippe Barradas | Theorics Limited |
In-app purchases
Sauna Metrics
- Pro Monthly$3.991 Month
- Pro Yearly7 Days trial$29.991 Year
CoffeeMeter
- Cafein Pro$24.991 Year









