Last Updated: September 2026
Welcome to Lens HRV. Data privacy and user trust are core principles of this project. These Terms outline your use of the app, how data is handled, and the limitations of this tool.
This application is a technical data tracking software. It provides heart rate variability (HRV) metrics extracted via photoplethysmography (PPG) exclusively for personal self-tracking, data analysis, and informational purposes.
Non-Medical Service: The metrics provided by Lens HRV are shared for informational purposes only. They do not constitute, under any circumstances, medical advice, clinical diagnosis, or treatment, nor do they replace consultation with a qualified healthcare professional.
Potential Inaccuracy of Information: In compliance with app distribution policies, users are expressly warned that the metrics provided by the app are derived from consumer-grade optical sensors (such as smartphone cameras) and mathematical algorithms. Therefore, they may not be 100% accurate, up-to-date, or applicable to a user's specific health condition. The use of any information or data provided by this app is strictly at the user's own risk.
Consult Your Doctor: Lens HRV is not intended to monitor, diagnose, or prevent any cardiovascular or medical condition. If you experience any health problems, discomfort, or plan to make lifestyle changes based on the app's metrics, always consult a licensed physician before making any decisions.
Collected User Data: To provide our core metrics, the app processes raw numerical data only. Lens HRV does not record or save videos or images. When the user places a finger on the camera, our Camera Analyzer instantly converts the microscopic changes in light reflection (blood pulse) into numbers. This numerical data is stored inside your phone's local database, saving anonymous rows per session.
Purposes of Using User Data: Lens HRV processes this numerical data strictly to calculate your metrics. Lens HRV applies mathematical algorithms to the raw pulse signals entirely on your device—filtering noise and handling artifacts—to display your final heart rate and variability results.
Local Data Control: Physiological data and history are stored exclusively on your local device storage for the core app experience. Since Lens HRV does not use user accounts, the user retains full and absolute control over this local data. You can completely erase your local database at any time by utilizing the data deletion option within the app settings or by simply uninstalling the application.
No Commercial Sharing: Lens HRV DOES NOT sell, rent, lease, or share user data with third parties, advertisement platforms, or data brokers under any circumstances.
Lens HRV reserves the right to revise or update these Terms and Privacy Policy at any time to reflect software optimizations, algorithmic updates, product-build changes, or regulatory changes. The most current version will always be accessible on this website and, where applicable, within the application settings.
If you have any questions regarding these terms, your local data privacy, or to report any technical issues, please contact the developer directly at contact@lenshrv.com.