Immersio
Track your cold plunge practice.
No accounts. No cloud. No compromises.
A privacy-first ice bath timer with HRV integration, streak tracking, rich analytics, and 14 achievements to unlock — entirely offline.
Core Experience
Smart Plunge Timer
A beautiful circular progress ring tracks your session in real time. Set a target duration and watch the ring turn green when you hit your goal — with satisfying pulsing animations.
Target Duration Goal
Set your daily goal from 1 to 5 minutes
Pause & Resume
Full session control with accurate timing
Temperature Logging
Record water temperature in Celsius or Fahrenheit
iOS HealthKit
HRV Integration
Measure your autonomic nervous system's response to cold. Immersio collects heart rate variability before and after each plunge to track your recovery over time.
Before & After Comparison
See how cold exposure shifts your HRV in real time
Dual-Line Trend Chart
Visualise pre/post HRV trends over 7d, 30d, 90d, or all-time
Stays On-Device
Health data read from HealthKit — never transmitted anywhere
Your Data
History & Analytics
Every session is logged chronologically with a calendar heatmap view. The analytics dashboard gives you charts for duration trends, temperature trends, and HRV comparisons — filterable by time range.
Calendar Heatmap
Visualise your consistency at a glance
Duration & Temperature Charts
Area and line charts tracking your progress over time
Time Range Filters
7 days, 30 days, 90 days, or all-time views
Stay Motivated
Trophies & Streaks
14 achievements across three categories keep you pushing forward. Build daily streaks with motivational messages that evolve as your commitment grows. Watch trophies unlock with glowing animations.
7-100
Day Streaks
1-500
Sessions
1h-24h
Total Cold Time
Why Immersio
Built for serious cold practitioners
Purpose-built for people who value both their practice and their privacy
Offline by Design
No accounts, no cloud sync, no backend. Everything stored locally via AsyncStorage. Your data never leaves your device.
10 Languages
English, Spanish, French, German, Portuguese, Italian, Russian, Chinese, Japanese, and Greek.
HRV Recovery Tracking
Measure your autonomic nervous system's response to cold with before/after HRV via Apple HealthKit.
Temperature Logging
Track water temperature for every session in Celsius or Fahrenheit. Spot trends in your tolerance over time.
Streak Motivation
Motivational messages that evolve as your commitment grows. Different encouragements at every streak milestone.
No Subscriptions
All features included. No paywalls, no premium tiers, no recurring charges. Free forever.
Your Data, Your Device
Privacy First
Your cold plunge data stays exactly where it belongs — on your phone
Offline by Design
Zero cloud sync. Zero server calls. Sessions, streaks, and HRV data never leave your phone.
No Accounts
No sign-up, no email, no passwords. Nothing to hack because nothing is stored remotely.
HealthKit Only
HRV data is read from Apple HealthKit and stays on-device. Never accessed, transmitted, or stored elsewhere.
Legal
Terms of Use
By using Immersio, you agree to these terms. We are committed to transparency and protecting your privacy.
1. Data Privacy
Immersio does not collect, store, or share any personal information. All session data, HRV readings, and preferences are processed and stored locally on your device. We will never sell or share your data.
2. Health Disclaimer
Immersio is a tracking tool and does not provide medical advice. Cold water immersion carries inherent risks. Always consult a healthcare professional before starting a cold exposure practice. Use the app at your own risk.
3. Intellectual Property
All content, features, and functionality in Immersio, including text, graphics, and images, are owned by Unusual Rocks or licensed for use. Reproduction, modification, or distribution without prior written permission is strictly prohibited.
4. Limited Liability
Unusual Rocks is not liable for any damages arising from the use of Immersio, including but not limited to loss of data, device malfunction, or any injury resulting from cold water immersion activities.
5. Updates to These Terms
We may update these Terms of Use at any time. Changes will take effect immediately upon publication in the app. Continued use indicates acceptance of the updated terms.
Start Your Cold Journey
Track every plunge. Monitor your recovery. Build unbreakable streaks. All without giving up your privacy.
Coming Soon on App Store