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Frontier X

Frontier X

by Fourthfrontier

317 ratings
137 reviews
💪 Health & Fitness
⚽ Sports
Free
In-App Purchases

Details

  • Released
  • Updated
  • October 28, 2019
  • September 21, 2026

Features

Background Location Access

Developer

Fourthfrontier
✨Promote your app ✨
Frontier X screenshot #1 for iPhone
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🔄6+ apps
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❓5 answered
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About

Track your heart health and exercise performance with a smart chest strap monitor. Gain detailed insights into heart rate, rhythms, and training load. Receive personalized feedback and alerts to optimize your workouts and understand your body better.

✓Heart Health Monitoring
✓Real-time Heart Rate & HRV
✓Breathing Rate & Strain Tracking
✓Activity Recording (24hrs)
✓Personalized Vibration Alerts
✓AI-enabled Training Insights
✓Metabolic Profile Analytics (Premium)
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What users say

Summarized from real user reviews of Frontier X. Based on 317 reviews and a 4.6/5 average, it highlights the 8 positives and 7 negatives reviewers mention most about this Health & Fitness app.

Positive things

  • 🚀Amazing device
  • 👍Great HR data and insight
  • 👍Helpful in gaining more data
  • 👍Fantastic concept with excellent execution
  • 👍Loads of useful information
  • 👍Brilliant device and gives peace of mind
  • 👍Awesome piece of kit
  • 👍Reliable, easy-to-use, does what it says

Negative things

  • 🐛Worse and worse as time goes by
  • 🐛ECG doesn't work
  • 🐛Chest strap issues, device keeps popping out
  • 🐛Paywalled functionality
  • 🐛Syncing issues, device keeps disconnecting
  • 🐛Noisy ECG signal during certain activities
  • 🐛App can't be viewed in landscape mode
See all reviews
+1

What's New in Frontier X

22.3.0

September 21, 2026

• Bug Fixes and Improvement

Subscription plans

Monthly

Get premium features for a month

$14.991 Month
7 Days trial
How to cancel Frontier X subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

My favorite health tech

I am recovering from a heart attack, I love being able to share my stats from workouts with my Doctors. I’m able to chart my progress, it keeps me from over doing it yet push myself to get stronger. Watches are great for simple stuff but I feel the X2 is a huge level up. It’s well worth the money.
GregP1966GregP1966

Response from developer

Hi, thank you for your feedback! It's great to hear that you're enjoying the device. If you ever have any questions or face any issues, please write to us at support@fourthfrontier.com

Fantastic device!

I use Fourth Frontier to monitor my AFIB and my exercise. It is accurate, easy to use, and gives tons of useful information. The battery lasts at least 24 hours and charges fast. The App is easy to use and tracks several important metrics. My cardiologist has found the ECG to be very helpful. I now know when I am working out too hard. I love this device and app!
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BradKCWBradKCW

Satisfied

You guys product ROCKS!
Otto CatOtto Cat

Frontier Zone

Rubbish
The device connects end of story it flashes the colours but the app having connected does nothing more no help from the company a waste of a lot of money
PentimentPentiment

Afib catcher helpful

I really like that this will catch my eighth episodes live, though so far I haven’t had one that I know about it.
Pkellner99Pkellner99
See 132 more reviews

Developer apps

Welbeck FX
Welbeck FX

by Fourthfrontier

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NM HRV
NM HRV

by Fourth Frontier Technologies Private Limited

💪 Health & Fitness
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Frontier X Plus
Frontier X Plus

by Fourth Frontier Technologies Private Limited

🏥 Medical

(3)

Free
See developer apps

User experience

🐞

Reported Bugs

4 issues

ECG stopped working

Bug

Inaccurate breathing rate and other metrics

Bug

Inability to edit activity details for indoor workouts

Bug

Syncing issues with Garmin devices after firmware updates

Bug
✨

Requested Features

6 requests

Add interval markers

Feature

Improve integration with Apple Fitness/Fitness+

Feature

Add support for ANT+

Feature

Improve compatibility with other fitness apps and devices

Feature

Add more customization options for workouts

Feature

Improve data visualization and analysis tools

Feature

FAQ

What does the Frontier X app do?

The Frontier X app is a companion to the Frontier X2 chest strap heart monitor. It allows you to connect with your device, view recorded data, and gain detailed insights into your heart health and exercise performance. You can track metrics like heart rate, HRV, breathing rate, strain, and training load.

What are the key features of the Frontier X app?

Key features include accurate activity recording for up to 24 hours, spotting changes in heart health with Rhythm and Strain monitoring, real-time personalized vibration alerts for training zones, health event tagging, integration with Bluetooth wearables, and AI-enabled post-activity training insights and recommendations.

How much does the Frontier X app cost?

The app itself is free to download. However, a paid Frontier Premium subscription is required to access the full feature set, including advanced analytics like Metabolic Profile Analytics, VO2 Max tracking, Readiness Score, and Sleep Stage Analysis. A 7-day free trial is offered, with monthly and annual plans available.

What devices is the Frontier X app compatible with?

The app is designed to work with the Frontier X2 chest strap smart heart monitor. It also seamlessly integrates with Bluetooth-enabled wearables and third-party devices such as GPS sports watches and bike computers. It integrates with HealthKit to export data to the Health app.

Who would benefit from using the Frontier X app?

The app is ideal for individuals who want to deeply understand their heart health and optimize their exercise performance. This includes athletes, runners, cyclists, and anyone interested in monitoring their cardiovascular fitness, stress levels, and recovery.