About this app
The concepts of Heart Rate measurement using reflective photoplethysmography (PPG) along with some of the basic digital signal processing (DSP) techniques are demonstrated. PPG waveforms are displayed and your heart rate is calculated. Signal processing controls are provided for experimenting with different DSP techniques on heart rate measurement. DSP techniques discussed in the tutorial sections include: - recursive high-pass filter - recursive low-pass filter - signal source and signal to noise ratio (SNR) - sampling rate The main SwiftUI code for the demo is provided for reference or as a starting point for further investigation.
Latest release
What’s New
- minor UI fix
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 12, 2026 · 4:29 PM Free
Screenshots
