Cardiogram - HR Monitor

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.