Cardia: Heart & HRV
Heart rate, HRV & recovery
Only for iPhone
$4.99 · Designed for iPhone. Not verified for macOS.
iPhone
Cardia turns the cardiac data your Apple Watch already collects into a calm, daily story about your heart — so you spend less time scrolling raw charts and more time understanding what changed.
THE DAILY CARDIAC BRIEFING
Open Cardia to a single, scrollable card story that answers the questions that actually matter: what's normal for you, what changed today, and whether anything is worth a closer look. Each card is written in plain language and compared to your own personal baseline — not a generic chart.
UNDERSTAND YOUR TRENDS
- Resting heart rate vs. your rolling 30-day baseline
- Heart rate variability (HRV) and recovery trends
- Today's heart rate range and walking heart rate average
- One-minute heart-rate recovery after activity
- Beautiful day / week / month / year charts with baseline bands
PERSONAL HEART-RATE ZONES
Adaptive zones built from your resting and max heart rate using the Karvonen method, with time-in-zone for recent workouts.
CONTEXT, NOT ALARM
Cardia uses honest, comparative language — "your resting heart rate is higher than your usual," never a diagnosis. Everything is framed against your own history, so you have an easy record to review and share with your doctor.
PRIVATE BY DESIGN
Your health data stays on your device. No account, no cloud upload, no advertising, and no third-party tracking of your health values.
REQUIREMENTS
An Apple Watch is needed for most metrics. Resting heart rate, heart rate variability, and heart-rate recovery require a compatible Apple Watch.
IMPORTANT
Cardia is a wellness and analytics tool. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Consult a healthcare professional for medical concerns. In an emergency, call your local emergency number.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Refreshed the App Store preview images to better show what the app does. No changes to the app itself in this update.
The developer, Brian Boler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Brian Boler
- Size
- 764.9 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Brian Boler
