# Frontier X > Smart chest strap heart monitor for detailed health and exercise insights. (iPhone/iPad app by Fourthfrontier.) - Source: https://appshunter.io/ios/app/frontier-x/id1483444499 (this page in markdown: same URL + `.md`) - Developer: [Fourthfrontier](https://appshunter.io/developer/1331846764) - Category: Health & Fitness, Sports - Price: Free with in-app purchases - Rating: 4.60/5 from 311 App Store ratings · 136 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 408 MB - Languages: American English - Released: 2019-10-28 - Data updated: 2026-08-26 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/frontier-x/id1483444499/reviews.md ## What is Frontier X? With your Frontier X/X2, 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 - a revolutionary chest strap wearable smart heart monitor and view your recorded data. Trusted by world-class athletes across the globe, the Frontier X2 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. ## Key features - 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) ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly | $14.99 | per month | | Yearly | $119.99 | per year | ## What do users think of Frontier X? Overall sentiment: positive **Pros** - 🚀 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 **Cons** - 🐛 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 **Commonly reported bugs** - ECG stopped working - Inaccurate breathing rate and other metrics - Inability to edit activity details for indoor workouts - Syncing issues with Garmin devices after firmware updates **Most requested features** - Add interval markers - Improve integration with Apple Fitness/Fitness+ - Add support for ANT+ - Improve compatibility with other fitness apps and devices - Add more customization options for workouts - Improve data visualization and analysis tools ## Recent user reviews (10 of 136) All indexed reviews: https://appshunter.io/ios/app/frontier-x/id1483444499/reviews.md ### 5/5 — Fantastic device! *2026-06-27* 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! ### 5/5 — Satisfied *2026-06-21, version 22.0.2* You guys product ROCKS! ### 1/5 — Frontier Zone *2026-06-16, version 22.0.2* 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 ### 5/5 — Afib catcher helpful *2026-06-10, version 22.0.2* I really like that this will catch my eighth episodes live, though so far I haven’t had one that I know about it. ### 4/5 — Excellent motivation *2026-05-23, version 22.0.1* I have AFIB. This app provides great feedback on your improvement metrics. Only complaint is it can mess up your Bluetooth connections. ### 2/5 — Misleading *2026-05-17, version 22.0.1* The app makes it look like if you pay for premium they will show advanced metrics like VO2 max. But that doesn’t seem to be the case. Maybe it unlocks on your next session after paying. Very disappointed. Also no way to change alerts after activity starts. No warning for wearing the sensor upside down. For the price the need to do better. ### 2/5 — Poor timing on forced upgrades *2026-04-23, version 22.0.0* Forced upgrades during workouts is no bueno. ### 1/5 — Not a valuable product *2026-04-17, version 21.1.1* Not at all reliable. I am in heart failure, and -need- data to help isolate my issues. Three times now, the app has insisted that I upgrade in the middle of my workout. Once, I had to have them recover my workout, as the upgrade trashed it. This is the third time in a month they have interrupted my workout to give me an “upgrade”. It’s a great toy, but has limited real benefit. ### 5/5 — Awesome Med Device *2026-04-11, version 21.1.0* Game changer! For Athletes that want more data! ### 1/5 — OMG *2026-04-10, version 21.1.0* Subpar upgrade on the interface software. Reoccurring Bluetooth connection issues. Most of the time tells you have arrhythmia, which I have been ignoring for several years. No options for interval training. Now trying to make money on subscriptions with AI that is not worth much. They need to up their game. ## Frequently asked questions about Frontier X ### 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. ## Version history (last 5 releases) ### 22.1.1 — 2026-07-07 • Bug Fixes and Improvement ### 22.1.0 — 2026-06-29 • Bug Fixes and Improvement ### 22.0.2 — 2026-06-08 • Bug Fixes and Improvement ### 22.0.1 — 2026-04-29 • Bug Fixes and Improvement ### 22.0.0 — 2026-04-20 • Bug Fixes and Improvement ## Apps similar to Frontier X | App | Rating | Price | Category | | --- | --- | --- | --- | | [CycleGo: Spin classes at home](https://appshunter.io/ios/app/cyclego-spin-classes-at-home/id1395075549) | 4.7 (973) | Free | Health & Fitness | | [Strava: Run, Bike, Walk](https://appshunter.io/ios/app/strava-run-bike-walk/id426826309) | 4.8 (369,826) | Free | Health & Fitness | | [JOOKS Running, hiking, cycling](https://appshunter.io/ios/app/jooks-running-hiking-cycling/id1114473318) | 4.8 (41) | Free | Health & Fitness | | [Nike Run Club: Running Coach](https://appshunter.io/ios/app/nike-run-club-running-coach/id387771637) | 4.8 (417,410) | Free | Health & Fitness | | [Running Walking Tracker Goals](https://appshunter.io/ios/app/running-walking-tracker-goals/id1136617388) | 4.8 (106,131) | Free | Health & Fitness | | [MOTTIV: Run & Triathlon Plans](https://appshunter.io/ios/app/mottiv-run-and-triathlon-plans/id1561001166) | 4.8 (70) | Free | Health & Fitness | ## More apps by Fourthfrontier - [NM HRV](https://appshunter.io/ios/app/nm-hrv/id6450173490) - [Frontier X Plus](https://appshunter.io/ios/app/frontier-x-plus/id6450455513) All apps by Fourthfrontier: https://appshunter.io/developer/1331846764 ## Related topics [fourth frontier](https://appshunter.io/ios/topics/fourth-frontier) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*