Frontier X vs hDrop App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Frontier X
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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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.
hDrop App
This wearable sensor tracks fluid and sodium loss through sweat during exercise. It provides personalized hydration insights based on your unique physiology, helping endurance athletes optimize their performance. Analyze sweat loss, sodium intake, and rate trends to build a tailored hydration strategy.
- Wearable sweat sensor
- Fluid and sodium loss tracking
- Personalized hydration strategy
- Sweat rate trend analysis
- Workout data analysis
- Comparison across conditions
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hDrop is the first wearable sweat sensor designed to extract data from your sweat during exercise. Independently validated research shows that hDrop is the world’s most accurate wearable sweat sensor, helping athletes understand how much fluid and sodium they lose while training. Whether you are preparing for a marathon, triathlon, cycling event, or intense training session, hydration strategy matters. Generic hydration advice does not account for the fact that every athlete sweats differently. hDrop helps you personalize your hydration based on real physiological data. Measure What You Lose in Sweat hDrop continuously monitors your sweat during exercise and provides insights that help you understand your body's hydration demands. Track key metrics including: • Sweat Loss – Estimate how much fluid you lose during training • Sweat Sodium Loss – Understand electrolyte loss to guide sodium intake • Sweat Rate Trends – Learn how your hydration needs change with intensity and environment Build Your Personal Hydration Strategy Use your sweat data to create a hydration plan tailored to your physiology. With the hDrop app you can: • Analyze sweat loss across workouts • Understand sodium losses during exercise • Compare sessions in different weather conditions • Improve hydration planning for races and long training sessions Designed for Endurance Athletes hDrop is built for athletes who depend on hydration precision: • Triathlon • Marathon and running • Cycling • Trail and ultra endurance sports • Heat training and high-intensity workouts Scientifically Validated Technology hDrop technology has been independently validated by university research, demonstrating high accuracy in estimating sweat loss and sodium loss during exercise. The system was developed with a focus on translating laboratory sweat testing into a wearable field solution for athletes. Unlock Advanced Features with hDrop Lab The optional hDrop Lab membership provides deeper analysis tools, advanced hydration insights, and personalized hydration guidance based on your sweat profile. Hydrate smarter. Perform better. DISCLAIMER: hDrop is not intended to diagnose any health condition. hDrop is not a medical device. Please do not take any critical decisions based on hDrop's current data. Optional Add-On Terms: hDrop Lab is available as an optional add-on auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The optional subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can manage and cancel your subscription in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hdroptech.com/privacy-policy
Screenshots
Verdict
The clearest difference is rating: Frontier X at 4.6 against hDrop App's 3.8. Frontier X also leads on review sentiment (82% vs 44%) and ratings volume (318 vs 12). hDrop App's advantage is monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Frontier X sells 2 in-app purchases, starting at $14.99 per month and hDrop App sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.
Frontier X holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Frontier X has 318 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 82% of Frontier X's written reviews are positive against 44% of hDrop App's.
Frontier X ships an update every 3 weeks, hDrop App fortnightly. The most recent releases landed on October 16, 2026 and October 18, 2026 respectively.
| Parameter | Frontier X | hDrop App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (318 ratings) — better | 3.8 (12 ratings) |
| Positive reviews | 81.8% of reviews — better | 43.8% of reviews |
| Number of ratings | 318 — better | 12 |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 569 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Fourthfrontier | hDrop Technologies Inc. |
Customer experience
Frontier X
hDrop App
Bugs and requests
Frontier X
Reported bugs
4 issues- 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
Requested features
6 requests- 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
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- Improve data visualization and analysis tools
hDrop App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Frontier X
- Monthly7 Days trial$14.991 Month
- Yearly7 Days trial$119.991 Year
hDrop App
- hDrop Lab7 Days trial$12.991 Month
- hDrop Lab7 Days trial$89.991 Year







