Helium is an intelligent endurance training app for Apple Watch and iOS. A comprehensive training tool for athletes of all skill levels - from beginners to advanced runners alike.

Unlike other basic run trackers, Helium was built from the ground up to make endurance training easy and fun at every point in the training lifecycle - from planning to execution to analysis.

Helium automatically learns each runner's individual Effort Zones and matches them to a training plan appropriate for their fitness level. Plans such as couch to 3k, 10k, half-marathon, and more are available directly in the app. Workouts are then scheduled according to each user’s personal calendar for maximum accountability.

Helium's Ambient Pacing Assistant on Apple Watch makes it easy to execute even the most complex interval workouts without distracting the runner's focus. The Assistant’s customizable visual, haptic, and audio feedback from Apple Watch helps runners stay in the appropriate Effort Zones prescribed by their training plan.

After a workout, Helium's metrics dashboard makes it easy to see fitness progress with Cardio Efficiency and Strain measurements. Runners can watch as their cardiovascular endurance improves steadily over time, thanks to the proven effectiveness of zone-based interval training.

Helium takes the guesswork and pain out of endurance training and makes running fun again. Run smarter with Helium.

Helium integrates with the Health app to analyze your past workouts and save new workouts.

Helium is available in the App Store and is $59.99/year with a 14-day free trial.

What’s New

Version 2021.03.02

Welcome to Helium! Helium is an intelligent endurance training app for Apple Watch and iOS. A comprehensive training tool for athletes of all skill levels - from beginners to advanced runners alike.

New in this update:

• Added explanation description for Cardio Efficiency metrics
• Fixed: metric system distance displayed incorrectly in some cases
• Fixed: non-US region weekly calendar days incorrectly aligned

Ratings and Reviews

4.7 out of 5
56 Ratings

56 Ratings

Murisaki ,

Heart Rate App that is simple to use

I’ve been using this app for 8 months. Likes: 1. Ability to adjust the green zone on the iPhone or Apple Watch easily. 2. Phone will sync with watch so I can put my phone on the treadmill and don’t have to keep looking at my watch to see how close I am to the red zone. 3. Haptics on Apple Watch watch to let you know when you need to get into the green zone (either from the low zone or in the red zone). All of this is part of the free app.

I ended up purchasing the sub for the graphs to support the developer because I really enjoy the simplicity of this app.

KatyDol ,

Amazing app!

When I first found Helium, it was a bit like magic to me. I’ve never seen a running app that is so well-suited for endurance training; the in-run heart rate zone reminders are seamless and really keep you on track in a way that no other app can. Plus, the app is so simple and focuses on only what it needs to without cluttering with other stuff - no weird social sharing like Strava, no aggressive product placement like Nike, etc. Helium is by far my favorite running app!

Diverginny ,

Great app

I’ve been using the beta version for a few weeks now. The heart rate cues in the programs is very helpful and is useful when you want to exercise based on what gets you in your zones rather than just hearing cues from a coach tell you when to run and when to walk.
I look forward to new programs as well. The included ones are thorough and easy to follow.

App Privacy

The developer,, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers

Data Linked to You

The following data may be collected and linked to your identity:

  • Health & Fitness
  • Purchases
  • Location
  • Contact Info
  • User Content
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

  • Siri

    Get things done within this app using just your voice.

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