SISU:
Cold, Heat, Breath & Stillness
Free · In-App Purchases · Designed for iPad
NEW: Lifetime Pro access now available! Unlock unlimited cold plunge, sauna, breathwork & meditation sessions with voice guidance in 9 languages.
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
• Wim Hof style 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
Ratings & Reviews
Sisu: Added promo code redemption so users can enter a code to unlock premium access.
The developer, Julie Nixon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Julie Nixon
- Size
- 170.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- Languages
English and 8 more
- English, Danish, Dutch, Finnish, French, German, Norwegian Bokmål, Spanish, Swedish
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Sisu Pro Lifetime $99.99
- SISU Pro $49.99
- SISU Pro $9.99
- Copyright
- © 2026 SISU:
