The top app for tracking heat and cold exposure activities. With live cold plunge water temperature display and a personal AI Coach
Ultra Plunge is the ultimate Apple Watch and iPhone app for cold plunges, saunas, steam rooms, ice baths, and more. Build consistency, track real progress, and get more out of every recovery session — right from your Apple Watch.
Real-Time Metrics on Your Wrist
• Live cold plunge water temperature (Apple Watch Ultra & Series 10)
• Sauna & steam room air temperature + humidity (optional Bluetooth sensor)
• Hyperbaric chamber pressure (up to 2 ATM)
• Active & resting heart rate
• Real time Heart Rate chart and Strain indicator
• Built-in timer & stopwatch
Smarter Sessions with AI-Powered Insights
• Dashboard with charts, showing trends and progress
• AI-powered coach provides insight on progress and consistency over time
• Guided breathing with customizable breathing patterns on your watch
• Personal goals, streaks, calories, and progress tracking
• Estimated sweat loss and heat load for Sauna sessions
• Helpful tips and recovery insights to support your routine
Widgets, Sharing & Integrations
• Apple Watch widgets for live session time & progress
• Share sessions to Strava or social media
• Track long-term progress across cold, heat, and recovery sessions
Track Every Session
• Cold Plunge, Ice Bath, Polar Plunge, Cold Shower
• Sauna, Steam Room, Hot Plunge
• Cryotherapy, Float Tank, Red Light Therapy, Hyperbaric Chamber
Free Trial & Subscription
Enjoy a 7-day free trial with full, ad-free access. After the trial, a subscription is required. Subscriptions renew automatically unless canceled at least 24 hours before the end of the billing period. You can manage or cancel your subscription anytime in your Apple Account settings.
Why Ultra Plunge?
Ultra Plunge isn’t just a tracker — it’s your personal wellness training partner. Whether your goal is resilience, circulation, mental toughness, or simply building a habit, Ultra Plunge helps you stay consistent and see real progress over time. Turn everyday routines into a powerful wellness practice. Life’s too short for lukewarm experiences.
Download Ultra Plunge today and begin transforming yourself from everyday human to wellness warrior. Because life’s too short for lukewarm experiences!
FAQ
Q: Do I need an Apple Watch?
A: Yes. Ultra Plunge is built for Apple Watch.
Q: Can Ultra Plunge measure water temperature?
A: Yes, with an Apple Watch Ultra or 10.
Q: How does Ultra Plunge measure sauna temperature and humidity?
A: With an optional Bluetooth temperature sensor, available at: https://ultraplunge.app
Q: Can I use Ultra Plunge with Strava?
A: Yes, you can automatically share sessions to Strava.
Q: Is my data secure?
A: All your data is stored in your iCloud account, not on our servers. The AI Coach uses a local model, none of your personal data is shared with an online AI service.
Q: Can I track multiple types of sessions?
A: Yes — cold, heat, and recovery sessions are all supported.
Q: Does Ultra Plunge track heart rate and calories?
A: Yes.
Q: Does Ultra Plunge estimate sweat loss?
A: Yes.
Q: Is there guided breathing included?
A: Yes, with adjustable breathing patterns on Apple Watch.
Q: Is there a free trial?
A: Yes, a 7-day free trial is included.
Q: Can I cancel my subscription anytime?
A: Yes, in your Apple Account settings.
Safety Disclaimer:
Always consult a healthcare professional before starting new wellness activities involving extreme temperatures. Avoid using your watch outside of Apple’s recommended operating temperature range. AI Coaching provides general wellness insights and motivational support — not medical advice. AI features use Apple Foundation Models and operate entirely on your device.
Privacy Policy: https://ultraplunge.app/privacy
Terms of Service: https://ultraplunge.app/terms
I've been using the Ultraplunge app to track my contrast therapy regimen, and I couldn't be more impressed. The app is intuitive, reliable, and perfectly tailored for managing cold and heat exposure routines. It makes logging sessions effortless and provides helpful insights that keep me consistent and motivated.What truly sets Ultraplunge apart is their customer service. Any questions I had—whether about features or best practices—were answered in near real-time. The support team was not only responsive but also followed up to ensure everything was working smoothly. That level of care and attention is rare and deeply appreciated.Highly recommend Ultraplunge to anyone serious about contrast therapy and looking for a seamless digital companion backed by stellar support.
Developer Response
Thank you for your review. We continue to work hard to make this the best app it can be. We always appreciate your feedback.
Good!
ozginch
It has all the features to be amazing but is not quite there. For some reason it doesn’t save a plunge automatically after ending it. When you get out of cold water you are usually trying to get dry and warm , not mess with your watch. Today I also discovered that if you’re not connected to the internet (e.g: out in the woods with no data) the app won’t load “the products” meaning you can’t start any of the activities…. For the price you’d think this was better developed, so yea kinda disappointed and hoping these issues can be solved so I can fully appreciate the features and improve my rating of the app.Edit: responsive developer improved on the issues I had we will see how well it work, thank you
Developer Response
Thank you for you feedback, we have added auto-save to our latest update and have also verified that the watch app does continue to work without an internet connection.
Great app, great support
Kydav7
When I first started using the app it was ok, it worked and did what I needed. But I had some issues. I reached out to support and to my surprise, all of my issues were already on track to be resolved in the next release and lo and behold they were! The latest release is exactly what I envisioned the Apple Watch app should be like. It works flawlessly and their support was kind enough to not only let me know the release was coming but also to let me know when it was available.
Best cold plunge app
Jrw1779
After cold plunging for over 5 years and trying every app out there I find this is best. All the information is simple and straightforward while in the water. Also, I found the water temp is very accurate. The AI is very interesting. As someone who started 5 years ago this is a savior. No more having to log in to my calendar app after taking pictures of my info outside. I highly recommend this app. Everyone that I have recommended it to feels the same way.
Our Biggest Update Yet!
> New AI Coach with trend summaries and per-session insights
> Watch App now stays in foreground for the entire session
> New Heart Rate Chart and Strain Indicator added to the activity screen
> Elapsed time live view appears automatically when the Watch app is in the background
> New Effort Level screen to rate your session difficulty
> Estimated sweat loss and heat load for Sauna & Steam sessions
> Stop button moved off main activity screen, swipe to end or pause
> Watch app now fully supports double tap gesture control on every screen. Perfect for when your watch screen is wet
> New option to pause activities
> Added more data to Dashboard Activity chart, along with comparisons to previous weeks
> Improved heart rate tracking
> Added red light therapy
> Multiple screen redesigns
> Export sessions to Strava
> Added watch settings to iOS app too
> New icon
> Added option to enable water lock for non-water activities
> Bug fixes
Version 2.0.3
The developer, R.P.A. Tech, 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 Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
RPA Tech, INC
Size
47.3 MB
Category
Health & Fitness
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
iPad Requires iPadOS 17.0 or later.
Mac Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
