Cardiogram is a private, real-time heart rate monitor for iPhone and Apple Watch users that stores health data locally.
Product velocity
Intense
Daily rank 🇺🇸
#81
▲6Health & Fitness · paid
Sentiment
3.4
11 reviews
Nemesis
Welltory: Health, Heart Rate
The App DNA
What makes this app unique?
Users hire Cardiogram to track heart rate data without the recurring subscription costs or cloud-sharing requirements of mainstream fitness apps.
For Privacy-conscious Apple Watch and fitness tracker users seeking heart rate monitoring without recurring subscription costs or cloud data sharing.
Key features
Stores all heart rate data locally on the device without cloud sync or account requirements.
Connects to external Bluetooth Low Energy sensors including Polar, Garmin, and Wahoo devices.
Automatically syncs heart rate data with Apple Health for cross-app metric visibility.
How much does it cost?
The $3.99 one-time purchase model positions the app as a non-subscription alternative to recurring fitness app fees.
Velocity
Intense developmentShow more...
5 versions in history. Development pace: intense.
Who built it?
Nicolae Gherasim
13+ apps tracked · Health & Fitness
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What do users think recently?
Users report: Fresh user feedback skews frustrated. Users appreciate minimalist design philosophy appeals to users who prefer avoiding advertisements and third-party data tracking and direct heart rate streaming from wearable devices to the phone provides immediate workout feedback.
How are ratings & reviews evolving?
What users say, by theme
- Minimalist design philosophy appeals to users who prefer avoiding advertisements and third-party data tracking
- Direct heart rate streaming from wearable devices to the phone provides immediate workout feedback
- Failure to write heart rate data to the health database prevents users from tracking workouts
4 of 4 recent reviews analyzed · limited sample
Read the full review analysisUnlock 2 more frustration themes and 1 user request, each backed by review evidence.
Access the full report for freeCompetition
Competitive landscape for Cardiogram: HR Monitor
How's the Health & Fitness market?
Cardiogram operates as a low-cost, one-time purchase utility in the Health & Fitness category. Its market position is currently constrained by technical instability, as the app has not seen a major feature update in over six months.
Read the market outlookThe rivals identified
By Welltory inc
Dominates the heart rate monitoring niche with massive scale and a high-frequency release cadence that keeps the product at the forefront of user health analytics.
- Provides deep AI-driven health insights and stress analysis beyond simple heart rate tracking
- Maintains a high-velocity release schedule with nine updates in the last six months
- Offers a comprehensive ecosystem that integrates diverse health data points for holistic monitoring
Unlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for Cardiogram: HR Monitor
Where is it heading?
Users report: The health-tracking market is consolidating around apps that provide deep, actionable insights rather than raw data. Cardiogram's maintenance-mode cadence leaves it exposed to rivals that offer better stability and deeper analytics, so the app must resolve its data-relay failures to remain relevant.
- Persistent failure to write data to the health database prevents users from tracking workouts, which directly erodes the app's primary utility.
- Inconsistent connectivity with external heart rate monitors disrupts the workout experience, leading to negative sentiment and potential churn to more stable alternatives.
The SWOT
- Local-only storage removes privacy switching costs
- One-time purchase model avoids recurring subscription friction
- Localized pricing in high-ARPU markets to undercut subscriptions
- Feature parity with modern iOS health standards
Next best moves
Rebuild Apple Health data-relay logic because it is the top-reported failure in reviews → restore core utility
+ 1 more prioritized moveThe counter-intuitive read
The app's lack of cloud storage is its greatest asset for privacy…
Read the full takeFeature gaps
AI-driven health insights (available in Welltory but absent here) +1
Since the last report: The app's market position has declined due to critical technical failures in health-database synchronization and a lack of accessible support, despite maintaining a clear privacy-first value proposition.
Bottom line
Cardiogram offers a clear privacy-first value proposition, but persistent data-sync failures break the core user experience, so the PM must prioritize system health integration over new feature development to prevent total churn.
Unlock 3 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeSources
- [1] App Store, source
Report last updated