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Frontier X

Frontier X

by Fourth Frontier Technologies Private Limited

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

Details

Released
October 28, 2019
Updated
October 27, 2026

Features

Background Location Access

Developer

Fourth Frontier Technologies Private Limited
✨Promote your app ✨
Frontier X screenshot #1 for iPhone
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About

Track your heart health and exercise performance with a smart chest strap wearable. Get detailed insights into heart rate, HRV, strain, and more, with personalized training feedback and alerts. Integrates with other devices and offers advanced analytics through a premium subscription.

✓Heart health and performance tracking
✓Real-time heart rate and HRV monitoring
✓Personalized vibration alerts
✓Activity recording up to 24 hours
✓Integration with Bluetooth wearables
✓AI-enabled training insights
✓Metabolic Profile Analytics (Premium)
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What users say about Frontier X

Reviews of Frontier X are mostly positive: the Health & Fitness app is rated 4.6/5 from 318 App Store ratings. What users like most: amazing device, great HR data and insight. Top complaints: worse and worse as time goes by, ECG doesn't work. Summarized from real user reviews.

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

What's New in Frontier X

22.5.1

October 27, 2026

• Enhanced Bluetooth security for Frontier X2 devices with Secure BLE Pairing/Bonding. • Bug fixes and performance improvements.

4

Subscriptions & In-App Purchases

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.
GGregP1966

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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BBradKCW

Satisfied

You guys product ROCKS!
OCOtto 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
PPentiment

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.
PPkellner99
See 132 more reviews

Developer apps

Welbeck FX
Welbeck FX

by Fourthfrontier

💪 Health & Fitness
NM HRV
NM HRV

by Fourth Frontier Technologies Private Limited

💪 Health & Fitness
Free
Frontier X Plus
Frontier X Plus

by Fourth Frontier Technologies Private Limited

🏥 Medical

(3)

Free
In-App Purchases
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 devices does Frontier X support?

Frontier X is designed to work with the Frontier X, X2, and X3 chest strap wearables. It also integrates with Bluetooth-enabled devices such as GPS sports watches and bike computers. The app is available on iPhone and Apple Watch.

Does Frontier X have ads?

No, Frontier X does not contain advertisements. The app is free to download and use, with optional premium features available through a subscription.

How accurate is the VO₂ Max data in Frontier X?

Frontier X's premium subscription offers precise, real-time VO₂ Max readings outside of a lab. Unlike other wearables that estimate using motion and heart rate, its advanced algorithms provide accurate tracking of cardiovascular efficiency and endurance potential.

What are the subscription options for Frontier X?

Frontier X offers a Premium subscription with a 7-day free trial. You can choose a monthly plan for $14.99 or an annual plan for $119.99, which offers substantial savings. Prices may vary by location and currency.

Can I view my sleep data with Frontier X?

Yes, Frontier X provides Sleep Stage Analysis through its premium subscription, accessible via the web app. This feature offers a comprehensive understanding of your sleep quality.

How often is Frontier X updated?

The latest version of Frontier X is 22.5.1, last updated on October 27, 2026. This indicates a commitment to ongoing development and feature enhancements.

What is the age rating for Frontier X?

Frontier X has an age rating of 4+, making it suitable for a wide range of users interested in health and fitness tracking.

What does the Readiness Score in Frontier X indicate?

The Readiness Score in Frontier X uses advanced algorithms, including heart rate and HRV, to determine if your body is ready for peak performance or requires recovery. It guides your daily activities and training decisions.