Frontier X
Fourth Frontier Health & Fitness In-app purchases
Companion App of Frontier X for runners, cyclists and other endurance athletes
- Rating
- 4.4
- 373 ratings
- Downloads
- 10K+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- Sep 22
- 2026 · v12.2.0.2
Screenshots
About Frontier X
This application allows you to connect with and use Frontier X - a revolutionary new wearable device that monitors your lungs and heart and gives you real-time alerts as you exercise. Once you download this application on your Android Phone, you can view your real-time data if you exercise with the Frontier X and your phone. In order to use this application, you need to have the Frontier X device, available at www.fourthfrontier.com
The Frontier X is a chest-worn device that has the following features:
--Suitable for Running, cycling, swimming and any other endurance exercises
--Effort estimation based on Breathing Rate
--Cardiac Strain estimation based on your ECG
--Real-time vibration alerts when you cross your Effort and Strain thresholds
--Accurate internal training load computation spanning all exercises
--Ability to live-stream and record your ECG for up to 24 hours
--Actionable training insights
--Easy to use. Strap on and start. Sync later
--View quick workout summary on device screen
--Highly accurate Heart Rate data
--IP67 Waterproof up to 1.5 M
--Battery: 14+ days of typical use, up to 24-hrs continuous use
The Frontier X is a chest-worn device that has the following features:
--Suitable for Running, cycling, swimming and any other endurance exercises
--Effort estimation based on Breathing Rate
--Cardiac Strain estimation based on your ECG
--Real-time vibration alerts when you cross your Effort and Strain thresholds
--Accurate internal training load computation spanning all exercises
--Ability to live-stream and record your ECG for up to 24 hours
--Actionable training insights
--Easy to use. Strap on and start. Sync later
--View quick workout summary on device screen
--Highly accurate Heart Rate data
--IP67 Waterproof up to 1.5 M
--Battery: 14+ days of typical use, up to 24-hrs continuous use
User reviews
Excellent app and product. Great for runners to train at a sensible pace and race at a sustainable pace.
The app combined with hardware device really helps to track user bio activities accurately.
Helps me train better.
Love app graph comparison and ECG's. I'm am using my FFx everyday and it's ECG graphs are excellent.🤗 Users Note. Very important to wet the skin before placing the device. UPDATE 14/03/21 1) Unable to exit app. 2) GPS tracking has only worked once. 🤗 3) Upload always uses mobile data.☹ 6) PDF reports will not uplo...
Excellent product for cardiac monitoring and training. I purchased this device for arrhythmia monitoring mainly, but I also wear when exercising. The battery life is great at around 2 days of continuous monitoring, and the unlimited cloud storage is very nice. The EKG quality is clear; short and wide complex rhythms...
Alternatives to Frontier X
Looking for apps like Frontier X? Here are 6 similar Android apps on Google Play. The highest rated is TrainerRoad (4.9/5), and all 6 are free to download.
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Cycling Diet 3.8
-
CycleGo - Indoor cycling app 4.6
-
TrainerRoad 4.9
-
Bestcycling y fitness online 4.0
-
SleepOn 2.1
-
Fit Radio Workout Music & Coac 4.4
| App | Rating | Price | Installs | Last updated |
|---|---|---|---|---|
| Frontier X | 4.4 / 5 | Free | 10,000+ | Sep 22, 2026 |
| Cycling Diet | 3.8 / 5 | Free | 500+ | – |
| CycleGo - Indoor cycling app | 4.6 / 5 | Free | 100,000+ | – |
| TrainerRoad | 4.9 / 5 | Free | 100,000+ | – |
| Bestcycling y fitness online | 4.0 / 5 | Free | 50,000+ | – |
| SleepOn | 2.1 / 5 | Free | 5,000+ | – |
| Fit Radio Workout Music & Coac | 4.4 / 5 | Free | 1,000,000+ | Aug 10, 2026 |