Frontier X22.4.0 - App Store

With your Frontier X/X2/X3, track your activity including exercise, rest or sleep to get detailed insights on heart health and exercise performance. This companion app allows you to connect with Frontier X2/X3 - a revolutionary chest strap wearable smart heart monitor and view your recorded data.

Trusted by world-class athletes across the globe, the Frontier X2/X3 is a chest-worn Smart Heart Monitor that provides in-depth real-time feedback on your heart health.
It can monitor your:
- Heart Health
- Heart Rate
- Heart Rate Variability (HRV)
- Breathing Rate
- Strain
- Rhythms
- Training Load
- Calories
- Stress, and a lot more.

. Accurately record your activity like exercise, running, cycling, resting, sleeping, meditation, etc for up to 24hrs with comprehensive heart health insights.
. Spot changes in your heart health with Rhythm and Strain.
. Train in the right zone without distractions with real-time, personalized, and discreet vibration alerts.
. Add health event tags to help you understand how lifestyle choices and behavior affect your health.
. Seamlessly integrate with Bluetooth-enabled wearables and third-party devices such as GPS sports watches, bike computers, and more.
. AI-enabled algorithms - Receive post-activity training insights, recommendations, and weekly goals.
. Frontier X integrates with HealthKit to export your Frontier X activities into the Health app and to read heart rate and biometric data.
. IP67 Waterproof up to 1.5 M
. Battery: 14+ days of typical use
Now get deeper insights and data with Frontier Premium Subscription*:

Metabolic Profile Analytics: Track training intensity and the impact of lifestyle changes on metabolic health with key metrics like VO₂ Max, VO₂ Zones, Oxygen Uptake, and Ventilatory Thresholds (VTs).

VO₂ Max: Get the most accurate real-time VO₂ Max data. While other wearables estimate using motion and heart rate, our advanced algorithms provides precise VO₂ Max readings outside of a lab, tracking cardiovascular efficiency and endurance potential.

Readiness Score: Determine if your body is ready for peak performance or needs recovery. Advanced algorithms use heart rate, heart rate variability (HRV) to guide your daily activities and training.

Sleep Stage Analysis: Get a comprehensive understanding of your sleep quality (Webapp).

With Frontier's Premium subscription and Metabolic Profile Analysis, tracking your VO₂ max becomes simpler and more precise.
*A Paid Frontier Premium subscription is required to access the full feature set .
The Premium feature subscription comes with a complimentary 7 days free trial, and continue at a minimal monthly cost starting from USD 14.99, or opt for an annual plan for substantial savings. Please note that prices may fluctuate based on your geographical location, currency, and current exchange rates

The Terms of use are available in the app and our website: https://in.fourthfrontier.com/pages/terms-of-use
About Fourth Frontier
Fourth Frontier is an innovative health-tech company focused on revolutionizing heart health monitoring with its cutting-edge wearable technology.

We are the World’s First Smart Heart Monitor. With over 5 billion heartbeats recorded from 120,000+ users across 50+ countries, we are empowering users to understand and manage their heart health in real-time.

These features make the Frontier App a comprehensive tool for heart health management and fitness improvement.

Download the app today and access the most accurate heart health data available.
Apps available for iPhone and Apple Watch.

Version History • Enhanced Bluetooth security for Frontier X2 devices with Secure BLE Pairing/Bonding.
• Bug fixes and performance improvements. 22.4.0 6d ago • Bug Fixes and Improvement 22.3.0 Sep 21 • Bug Fixes and Improvement 22.2.1 Sep 12 • Bug Fixes and Improvement 22.2.0 Sep 8 • Bug Fixes and Improvement 22.1.1 Jul 7 • Bug Fixes and Improvement 22.1.0 Jun 29 • Bug Fixes and Improvement 22.0.2 Jun 8 • Bug Fixes and Improvement 22.0.1 Apr 29 • Bug Fixes and Improvement 22.0.0 Apr 20 • Bug Fixes and Improvement 21.1.1 Apr 15 Upgrade to a Smarter Home Experience
We heard your feedback and here is an all new UI for a smoother experience.

Spot Patterns with the New Trends Feature
Powerful Trends feature to spot patterns across weeks and months to help you with data backed decisions.

Readiness — Reimagined
A streamlined flow with clearer guidance, and easy-to-understand results to understand your readiness for the day.

Smoother Activity Start
The Start Activity screen now offers a cleaner layout and quicker access to the right activity, helping you get moving faster.

Performance Improvements
Smashed some pesky bugs and did under-the-hood enhancements for a smoother, more reliable experience. 21.1.0 Mar 20 Upgrade to a Smarter Home Experience
We heard your feedback and here is an all new UI for a smoother experience.

Spot Patterns with the New Trends Feature
Powerful Trends feature to spot patterns across weeks and months to help you with data backed decisions.

Readiness — Reimagined
A streamlined flow with clearer guidance, and easy-to-understand results to understand your readiness for the day.

Smoother Activity Start
The Start Activity screen now offers a cleaner layout and quicker access to the right activity, helping you get moving faster.

Performance Improvements
Smashed some pesky bugs and did under-the-hood enhancements for a smoother, more reliable experience. 21.0.0 Mar 4 • Bug Fixes and Improvement. 20.2.0 Jan 22 • Bug Fixes and Improvement. 20.1.0 11/12/2025 • Bug Fixes and Improvement. 20.0.1 09/25/2025 • Bug Fixes and Improvement. 19.9.1 07/17/2025 • Bug Fixes and Improvement. 19.9 01/22/2025 • Bug Fixes and Improvement. 19.8 01/17/2025 • Track changes in your VO2 Max and Readiness Score over time via Trends (Premium).
• Bug Fixes and Improvement. 19.7 12/11/2024 • Bug Fixes and Improvement. 19.6 11/22/2024 • Bug Fixes and Improvement. 19.5 11/20/2024 • Improved UI Design for Graph Screen to enhance data visualization and usability.
• Bug Fixes and Improvement. 19.4 11/10/2024 We’re excited to introduce 4 new premium features designed to give you deeper insights into your heart health and performance:

1. Metabolic Profile Analysis – Measure your VO2 Max, Ventilatory Threshold, and Oxygen Uptake during exercise. Analyze how your body utilizes energy during workouts and sports activities to optimize performance.

2. VO2 Max – The most accurate VO2 max tracking outside of a lab. It estimates how efficiently your body uses oxygen during a workout.

3. Readiness Score – Measure your recovery and know when your body is primed for peak performance

4. Sleep Stage Analysis – Track and understand your sleep stages, and assess sleep quality and patterns to improve your overall sleep health. (Available only on the web dashboard)

Try Frontier Premium FREE for 7 days! 19.3 10/18/2024 We’re excited to introduce 4 new premium features designed to give you deeper insights into your heart health and performance:

1. Metabolic Profile Analysis – Measure your VO2 Max, Ventilatory Threshold, and Oxygen Uptake during exercise. Analyze how your body utilizes energy during workouts and sports activities to optimize performance.

2. VO2 Max – The most accurate VO2 max tracking outside of a lab. It estimates how efficiently your body uses oxygen during a workout.

3. Readiness Score – Measure your recovery and know when your body is primed for peak performance

4. Sleep Stage Analysis – Track and understand your sleep stages, and assess sleep quality and patterns to improve your overall sleep health. (Available only on the web dashboard)

Try Frontier Premium FREE for 7 days! 19.2 10/16/2024 •⁠ ⁠Bug fixes and Improvements. 19.1 10/14/2024