Blood Pressure Log, Heart Rate by NarrativeLab OU represents a mobile health solution leveraging iOS device hardware for non-invasive cardiovascular monitoring. The application occupies a niche in the consumer health technology market by utilizing smartphone cameras for optical heart rate detection, eliminating the need for external wearable devices. The core functionality centers around photoplethysmography technology, where users place their finger over the device's camera lens to capture pulse waveforms. The application processes this data to generate heart rate readings and stores measurements with timestamps for longitudinal tracking. Additional features include blood pressure manual entry, data visualization through trend charts, and export capabilities for sharing with healthcare providers. The system provides basic analytics showing fluctuations correlated with time of day and activity patterns. User experience demonstrates straightforward navigation with a minimalist interface design. The measurement process requires approximately 15-30 seconds of finger placement with adequate lighting conditions. Real-world usage patterns indicate most users employ the application for daily check-ins, with particular utility for monitoring stress responses, exercise recovery, and general cardiovascular trends. The interface prioritizes large, readable metrics and color-coded indicators for quick interpretation of results. User feedback consistently highlights measurement reliability and data visualization strengths. Abby AAaa (September 2, 2025) noted 'Quick results and the charts make tracking my health simple,' while Be Paula (August 6, 2025) reported daily use with consistent accuracy. Kevin_Perez2 (July 10, 2025) emphasized long-term tracking benefits, stating the trend graphs 'help me understand what's normal for my body.' These testimonials reflect general satisfaction with core functionality despite some users noting occasional measurement variability under suboptimal conditions. The application demonstrates strongest utility for casual health monitoring rather than clinical diagnosis. Primary advantages include accessibility and convenience of camera-based measurement, while limitations involve inherent accuracy constraints of optical heart rate technology compared to medical-grade devices. Ideal use cases include general wellness tracking, fitness recovery monitoring, and preliminary cardiovascular awareness before consulting medical professionals.