ColdLog vs SISU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ColdLog
Effortlessly track your cold plunge and ice bath sessions with this app. It automatically captures data like water temperature, duration, and heart rate directly from your Apple Watch, offering detailed insights and scientifically accurate calorie calculations.
- One-tap workout start on Apple Watch
- Automatic Water Lock activation
- Comprehensive data collection (temp, duration, HR)
- Scientifically accurate calorie calculation
- Session photo gallery
- Customizable share cards
- HealthKit integration
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ColdLog – Cold Plunge Tracker One tap. One plunge. All the data you need. ColdLog is the simplest way to track your cold plunge and ice bath sessions on Apple Watch. No complicated setup, no unnecessary features – just start your workout and let your Watch capture everything automatically. DESIGNED FOR APPLE WATCH ULTRA ColdLog is built with Apple Watch Ultra users in mind. Use the Action Button to instantly start your cold plunge session – even with wet hands. Add the watch face complication for one-tap access. Water Lock activates automatically when you enter the water. COMPREHENSIVE DATA COLLECTION Every plunge tells a story. ColdLog captures more data than any other cold plunge app: - Water Temperature – Live readings from Apple Watch sensors - Duration – Precise timing of every session - Heart Rate – Continuous monitoring throughout your plunge with detailed graph - Calories Burned – Science-based calculation using cold-induced thermogenesis research - GPS Location – See where you plunge on the map - Weather Conditions – Outside temperature, humidity, and conditions (Pro) - Workout Route – Sessions appear in Apple Fitness with full route SCIENTIFICALLY ACCURATE CALORIE CALCULATION Unlike other apps that guess your calorie burn, ColdLog uses peer-reviewed research on cold water immersion. The formula accounts for water temperature, session duration, your personal BMR, and post-immersion thermogenesis – that "afterburn" effect when your body continues burning calories after you exit. INSIGHTS & ANALYTICS (PRO) Track your progress with beautiful monthly charts: - Time in Water – See your total cold exposure - Temperature Trends – Track how cold you're going - Heart Rate Patterns – Monitor your body's adaptation - Energy Burned – Visualize your calorie expenditure - Cold Stress Score – Measure your overall cold exposure intensity SEAMLESS SYNC Start a session on your Watch, view details on your iPhone. Everything syncs automatically via WatchConnectivity. All data stays private on your devices and in Apple Health – no accounts, no cloud, no tracking. CAPTURE & SHARE YOUR PLUNGES Add up to 3 photos to each session – build your personal cold plunge album. Frozen lake? Ice hole? Ocean sunrise? Capture those epic moments. Ready to share? Choose from multiple card styles: a clean stats-only card or stunning photo overlays with your session data. Share to Instagram, WhatsApp, or anywhere else. Each card shows your water temperature, duration, weather, and location. KEY FEATURES - One-tap workout start from Apple Watch - Action Button support (Apple Watch Ultra) - Watch face complication for quick access - Automatic Water Lock activation - Timer alerts with haptic feedback (Pro) - Auto-save option for hands-free workflow - Session photo gallery (up to 3 photos) - Custom share cards with photo overlays - Personal notes for each session - HealthKit integration - Celsius & Fahrenheit support - No account required - Offline-first design WHO IS COLDLOG FOR? Whether you're a Wim Hof method practitioner, cold water therapy enthusiast, competitive ice swimmer, or just starting your cold exposure journey – ColdLog helps you track progress and stay consistent. Built by cold plunge enthusiasts who wanted an app that works as simply as stepping into cold water. No bloat. No distractions. Just you, the cold, and your data. FREE TO USE ColdLog is free with all core features – track duration, water temperature, heart rate, calories, and GPS location. History is limited to 3 sessions. Upgrade to Pro for unlimited session history, detailed insights with charts, weather tracking, and timer alerts. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://coldlog.eu/privacy/
SISU
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Sisu helps you build resilience through cold exposure, heat therapy, breathwork, and mindfulness meditation. Track your progress, follow guided sessions, and develop the mental fortitude to push through discomfort. COLD PLUNGE & ICE BATH TRACKING • Automatic plunge detection with Apple Watch • Real-time heart rate monitoring during sessions • Track water temperature and duration • Voice guidance to calm your mind in the cold • See your steadiness score improve over time SAUNA & HEAT THERAPY • Log sauna sessions with temperature tracking • Monitor heart rate and recovery metrics • Guided breathing to maximize heat benefits • Track contrast therapy (hot/cold) routines GUIDED BREATHWORK • Cyclic Hyperventilation breathing exercises • Box breathing for stress relief • Custom breath patterns and holds • Audio guidance with calming soundscapes • Track breath hold times and rounds MINDFULNESS & MEDITATION • Stillness practice with gentle guidance • Focus on steadiness and presence • Perfect complement to cold exposure APPLE WATCH COMPANION • Start sessions directly from your wrist • Live heart rate during plunges and saunas • Haptic cues for breathing exercises • Complications for quick access HEALTH & INSIGHTS • Sync with Apple Health for HRV and sleep data • Weekly progress reports and trends • See how cold exposure affects your recovery • Track consistency streaks and goals MULTI-STEP ROUTINES • Create custom flows combining practices • Contrast therapy templates (sauna → cold plunge) • Morning routines with breathwork + cold PRO FEATURES • Unlimited sessions (free tier: 3/month) • Premium soundscapes (rain, thunder, forest) • Full session history • Advanced health insights • Voice guidance in 9 languages • Apple Watch app Whether you're training for cold water swimming, optimizing your sauna routine, or building a daily breathwork practice, Sisu gives you the tools to develop true resilience. The name "Sisu" comes from Finnish and represents extraordinary determination and courage in the face of adversity—exactly what you need to embrace the cold. Start your journey to steadiness today. Terms of Use: https://www.sisu.ing/terms Privacy Policy: https://www.sisu.ing/privacy
Screenshots
Verdict
The clearest difference is update cadence: ColdLog at weekly against SISU's fortnightly. ColdLog also leads on iOS requirement (17.0 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. ColdLog sells 1 in-app purchase, starting at $8.99 per year and SISU sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.
ColdLog ships an update weekly, SISU fortnightly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.
| Parameter | ColdLog | SISU |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 17 MB | 163 MB |
| Age rating | 4+ | 4+ |
| Developer | JRSW s.r.o. | Julie Nixon |
In-app purchases
ColdLog
- ColdLog PRO$8.991 Year
SISU
- SISU Pro$6.991 Month
- SISU Pro$34.991 Year
- Sisu Pro Lifetime$69.99








