Health Scan: Heart & Sugar enters a crowded market of wellness apps with a specific premise: using a smartphone's optical sensors to derive health data. Developed by Hong Kong Vivid Limited, the app positions itself as a supplementary tool for general awareness rather than a certified medical device. Its core promise is accessibility, allowing users to take readings anytime by simply placing a finger over the camera lens. The app's functionality centers on two distinct modes. For heart rate, it uses the camera and flash to detect subtle color changes in the fingertip corresponding to blood flow pulses. The blood sugar estimation, importantly labeled as an approximation, likely utilizes a similar photoplethysmography (PPG) technique to analyze blood characteristics, though the developers clarify it is not a replacement for a glucometer. Readings are saved in a simple log, allowing users to track trends over days or weeks. A basic insights section may highlight resting heart rate ranges or suggest when to seek professional advice. In real-world use, the process is straightforward. Users open the app, select the metric, and follow on-screen instructions to place their finger correctly. Consistent lighting and a steady hand are crucial for accurate readings. The interface is generally clean, though some menus feel a bit sparse. This makes it suitable for quick morning checks or tracking how vitals respond post-exercise, but it requires a disciplined approach to ensure consistent measurement conditions for comparable data. With no written reviews available, the 4.0-star aggregate rating suggests users find the app reliable for its intended purpose of casual tracking. Typically, apps in this category receive feedback praising their convenience and ease of use, while critical reviews often highlight discrepancies compared to medical-grade devices or frustration during calibration. Potential users should have realistic expectations; this is a wellness tracker, not a diagnostic tool. Overall, Health Scan: Heart & Sugar is a practical option for non-medical, proactive health observation. Its main strength is eliminating the need for separate hardware, making basic monitoring more approachable. The significant limitation, as with all camera-based measurements, is variable accuracy influenced by user technique and environment. It serves best as a log for personal reference, with any concerning readings warranting follow-up with a healthcare professional.