Cardiogram: HR Monitor

Cardiogram is a fast, accurate heart rate monitor and BPM tracker engineered for athletes, fitness enthusiasts, and anyone who wants complete insight into their cardiovascular training. Connect an Apple Watch, compatible Bluetooth Low Energy (BLE) chest strap, or Health Connect to track your pulse live during workouts, HIIT sessions, and recovery - crafted to perfection with 100% on-device privacy.

What is Cardiogram: HR Monitor?

Cardiogram: HR Monitor is a privacy-first mobile application for iPhone and Android that provides real-time heart rate (BPM) tracking, color-coded training zone analysis, and recovery monitoring. Unlike standard fitness apps, Cardiogram operates entirely offline with no user account, no cloud storage, and no recurring subscriptions. It integrates seamlessly with Apple Health, Google Health Connect, Apple Watch, and external Bluetooth Low Energy (BLE) heart rate monitors such as Polar, Garmin, and Wahoo.

Real-Time Heart Rate & BPM Monitoring

Track your heart rate live with instant visual feedback. Whether you are aiming for peak cardiovascular endurance or pacing a recovery session, Cardiogram provides reliable, battery-efficient BPM tracking across any activity:

• Cardio & Endurance: Running, road cycling, indoor cycling, and rowing.
• High-Intensity Training: HIIT sessions, interval sprints, and gym workouts.
• Daily Health & Recovery: Walking, active recovery tracking, and heart rate trends.

Universal BLE Sensor & Smartwatch Compatibility

Cardiogram is built for hardware flexibility, connecting in seconds to industry-standard external sensors and smartwatches:

• BLE Chest Straps & Armbands: Works with Polar (H10, H9, Verity Sense), Garmin (HRM-Pro, HRM-Dual), Wahoo (TICKR), CooSpo, Magene, and all standard Bluetooth Low Energy (BLE) heart rate monitors.
• Apple Watch & Apple Health: Seamless real-time workout syncing and historical BPM analysis on iOS.
• Google Health Connect: Synchronize your fitness and workout data across compatible Android applications without sacrificing privacy.

Train Smarter with Color-Coded Heart Rate Zones

Understand your workout intensity at a glance. Cardiogram categorizes your live BPM into five color-coded training zones so you can stay in your target range:

1. Fitness / Warm-Up: Light intensity for recovery and preparation.
2. Fat Burn: Optimal aerobic zone for basic endurance and fat oxidation.
3. Aerobic: Moderate-to-vigorous intensity for cardiovascular capacity.
4. Anaerobic: High-intensity threshold training for speed and performance.
5. Maximum Effort: Peak performance zone for short intervals and sprints.

Privacy First. Always.

Most fitness platforms gate your heart rate data behind user logins, cloud accounts, and recurring subscriptions. Cardiogram takes a radically different approach:

• No Account Required: Start tracking your heart rate the second you open the app.
• No Subscriptions: Flat, honest access without recurring monthly fees.
• No Cloud Storage: Your health metrics are stored locally on your physical device.
• No Data Monetization: Zero advertising profiles, zero data selling, and zero third-party tracking.

Frequently Asked Questions

Does Cardiogram require a subscription or user account?

No. Cardiogram does not require a user account, login, or recurring subscription. All features are accessible without signing up, and your data remains under your control.

Which Bluetooth heart rate monitors work with Cardiogram?

Cardiogram connects to any standard Bluetooth Low Energy (BLE) heart rate sensor. This includes popular chest straps and optical armbands such as the Polar H10, Polar Verity Sense, Garmin HRM-Pro, Wahoo TICKR, CooSpo, and Magene sensors.

Does Cardiogram sync with Apple Health and Google Health Connect?

Yes. On iPhone, Cardiogram integrates directly with Apple Health and Apple Watch. On Android, it supports Google Health Connect, allowing you to synchronize your workout sessions with compatible fitness ecosystems securely.

Where is my heart rate data stored?

All heart rate, workout, and BPM history is stored locally on your device. Cardiogram does not upload your sensitive health information to cloud servers.