OpenPPG vs IntervalBeep

OpenPPG is a free, research-oriented iOS application designed to close the gap in accessible and transparent PPG data acquisition. Built by researchers for researchers, it enables recording of raw, high-quality photoplethysmography (PPG) signals directly from the smartphone camera, with full export for scientific analysis. Key Features • Raw signal access – capture unprocessed PPG waveforms with complete control over export (CSV format). • Flexible preprocessing – raw signals, basic and advanced filtering, signal quality assessment or fully calculated metrics in one app to enhance your research • Feature extraction – access directly over 11 automatically calculated temporal and morphological metrics without need for advanced signal processing • Metadata & annotations – mark events while taking measurements in real time and customise forms to fit your study protocol • Explainable pipeline – reproducible acquisition process with transparent documentation to ensure research reliability. Why OpenPPG? Most mobile tools restrict access to raw data, hide acquisition details, or require payment. OpenPPG removes these barriers by providing a free, standardised, and reproducible way to acquire PPG signals. It supports innovation in signal processing, machine learning, and digital biomarker discovery. Important: OpenPPG is intended solely for research purposes. It is not a medical device and must not be used for diagnosis, treatment, or patient self-monitoring.

IntervalBeep is a clean, focused interval timer that beeps at set intervals so you can concentrate on what matters. Set a total time and an interval, IntervalBeep handles the rest. A clear beep sounds at every interval, a distinct sound marks the start, and a final tone lets you know you're done. No complicated setup, no clutter. SIMPLE TO USE - Set your total time (hours, minutes, seconds) - Set your interval - Press Start, that's it CUSTOMIZABLE SOUNDS - Choose from 12 musical notes for each sound - Configure start, interval, and end sounds separately - Set note duration (short, medium, long) - Up to 3 notes per sound - Preview sounds before you start WORKS IN THE BACKGROUND - Timer keeps running when your screen is locked - Audio signals play reliably in the background - Optional haptic feedback BEAUTIFUL DESIGN - Dual progress rings show total and interval time at a glance - Dark interface for comfortable use in any environment - Clean typography with color-coded counters - Responsive layout for iPhone and iPad USE IT FOR ANYTHING - Workout intervals and HIIT training - Cooking and baking - Study sessions and pomodoro technique - Meditation and breathing exercises - Presentations and public speaking practice - Music practice and rehearsals ONE-TIME PURCHASE No subscriptions. No ads. No in-app purchases. Pay once, use forever.