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Recovery Heart Rate now appears directly on every workout in History and is safely preserved across Health Connect syncs and app reinstalls. If your sensor disconnects early, recovery can now be calculated using watch data via Health Connect—just pull down on History to backfill missing values. This release also fixes post-workout crashes, resolves Samsung Health Connect stability issues, and reduces overall app size.
Real-time heart rate monitoring with BLE sensors. Private & offline
Cardiogram is a private, real-time heart rate monitor, BPM tracker, and workout analysis app designed for Android users who want accurate pulse data without subscriptions, cloud services, or accounts. Monitor, record, and analyze your heart rate during workouts, cardio, recovery, or daily training using compatible Bluetooth Low Energy (BLE) chest straps and sensors. Sync effortlessly with Google Health Connect while keeping total control over your health data. Unlike many fitness apps, Cardiogram works offline without accounts, cloud databases, or data tracking. Your health data stays on your device, where it belongs. AUTOMATIC RECOVERY HEART RATE (HRR) Track how quickly your heart rate drops after exercise—a key indicator of cardiovascular fitness and endurance progress. Automatic Post-Workout Capture: For workouts lasting 5+ minutes, Cardiogram listens during the 2-minute post-workout window to record recovery trends. HRR Calculation: Calculates your exact Recovery Heart Rate drop in the background without blocking the UI, letting you start a new session immediately. Cardiovascular Progress: Review recovery trends over time to better understand stamina, pacing, and rest needs. REAL-TIME HEART RATE & BPM TRACKING Track live heart rate and BPM from compatible Bluetooth heart rate sensors with low latency and battery-friendly performance: Running, walking, and endurance pacing Road cycling and indoor bike sessions HIIT, cross-training, and weightlifting Cardio workouts and gym training Daily resting heart rate and recovery monitoring HEALTH CONNECT INTEGRATION & WORKOUT ANALYSIS Sync your heart rate data with Google Health Connect to keep your fitness logs organized in one private location. Import and analyze workout sessions recorded across your Android ecosystem, including apps like Strava and Garmin. Review complete heart rate trends, originating source labels, and workout intensity in one place. 100% PRIVATE & OFFLINE-FIRST Your health data belongs to you. No account or sign-up required No recurring monthly subscriptions No cloud storage or remote servers No data selling, tracking, or advertising profiles 100% local data storage on your physical device COLOR-CODED HEART RATE ZONES FOR SMARTER TRAINING Understand workout intensity instantly with live visual feedback across five target zones: Fitness / Warm-Up: Light intensity for warm-ups and active recovery. Fat Burn: Aerobic zone for building base endurance. Aerobic: Moderate-to-vigorous effort for cardiovascular capacity. Anaerobic: Threshold training for speed and stamina. Maximum Effort: Peak effort zone for short interval sprints. WIDE BLE SENSOR & SMARTWATCH COMPATIBILITY Cardiogram connects in seconds to devices broadcasting standard Bluetooth Low Energy (BLE) heart rate profiles: Chest Straps & Armbands: Polar (H10, H9, Verity Sense), Garmin (HRM-Pro, HRM-Dual), Wahoo (TICKR), CooSpo, Magene, and standard BLE sensors. Supported Smartwatches: Sports watches featuring a "Broadcast HR" mode (such as many Garmin and Coros models) transmit live heart rate directly to Cardiogram. Smartwatch Compatibility Note: Lifestyle smartwatches (including Samsung Galaxy Watch and Google Pixel Watch) use proprietary closed sensors that do not broadcast live HR over Bluetooth to third-party apps. For these devices, Cardiogram can import completed workouts via Google Health Connect. BUILT FOR FITNESS AND DAILY MONITORING Use Cardiogram to: Monitor real-time workout heart rate and BPM Measure 1-Minute Recovery Heart Rate (HRR) Analyze color-coded training effort zones Import Health Connect workouts with clear source labels Keep your fitness history 100% private and offline Disclaimer: Cardiogram is not a medical device and does not diagnose, treat, cure, or prevent medical conditions. Always consult a qualified healthcare professional regarding medical concerns.