Heart Monitor 24 brings high-fidelity heart data logging to your iPhone and iPad. Record raw wave data with your Polar sports sensor and reveal intricate heart patterns in real-time.
Heart Monitor 24 provides a continuous, high-resolution look at your heart's electrical patterns. By connecting to a Polar H10 fitness sensor, the app records every pulse for 24 hours or more, allowing you to see how your heart reacts to training, recovery, and daily stress. This long-form data logging offers a level of detail for athletes and biohackers that goes far beyond standard 30-second snapshots of smart watches.
Deep insights starts with high-quality data. Heart Monitor 24 uses the 130Hz sampling rate of the Polar H10 sports sensor to capture raw heart data in great detail. Since the sensor is worn on your chest, the signal stays stable even during intense physical activity. Heart Monitor 24 visualizes your data in real-time, enabling immediate pattern analysis.
Unlock the hidden details of your heart's electrical signal. Heart Monitor 24 applies baseline optimization and advanced signal detection to the raw data to reliably identify R peaks. It automatically calculates R-R intervals and provides immediate insight into your rhythm patterns for training and recovery analysis.
Heart Monitor 24 is built on a strict Local-First privacy model, so your recordings are always under your control.
Heart Monitor 24 requires a Polar H10 sports sensor, which can be purchased from Amazon US or Amazon EU. The Heart Monitor 24 app can be downloaded from the App Store for iPads or iPhones.
No. Heart Monitor 24 is designed for fitness, research, and educational purposes only. It is a data visualization tool. While it uses high-quality data from the Polar sports sensor, the app is not a certified medical device and is not intended to diagnose, treat, or monitor any medical condition. It does not provide medical advice or alerts.
The free version includes all features of the Pro version with one limitation: heart recordings are capped at 60 seconds. The Pro version removes this limit, allowing unlimited recording duration for long-form data analysis.
Yes. Because the Polar H10 is comfortable and the app records continuously, you can capture data during sleep to analyze your resting heart patterns and see how your body recovers overnight.
No. We follow a strict "Local-First" privacy policy. All recordings are stored exclusively on your device. We do not upload your data to any cloud servers, ensuring you maintain complete ownership and privacy of your information.
Yes. You can export full recordings as CSV files. This provides access to the raw 130Hz voltage data, which can be opened in Excel, MATLAB, or Python for personal research or data science projects.
Optical sensors (like those on most watches) measure blood flow, which can be inconsistent during movement. The Polar H10 is a sports sensor that measures the electrical signal of your heart directly at 130Hz. This provides the high-fidelity data necessary for detailed waveform visualization and pattern detection.
It takes a short while for the belt to activate and become visible in the connect screen. Tip: Moistening the electrode areas of the Polar H10 sensor strap before use is necessary to ensure accurate and instant signal detection.
No. Please do not pair the Polar H10 in your iPhone's main Bluetooth settings. Simply open Heart Monitor 24, tap "Record", and the app will automatically find and connect to your device.
A poor signal is usually caused by dry skin or a loose strap. Make sure the strap is tight against your chest and the electrodes are well-moistened. Static electricity from synthetic shirts can also interfere, so try wearing cotton or wetting the shirt over the strap.
If the device appears connected but shows no signal, try detaching the sensor pod from the strap and snapping it back on. If the issue persists, the battery (CR2025) may need to be replaced.