About this app
Tap, double-tap, drag, pinch, and rotate to make sound. Contrast is an interactive playground for sound. Add squares by double-tapping anywhere. Squares represent channels of sound which can be manipulated in various ways dragging, pinching, rotating, and tapping. Concept and programming by Johan Halin. Design by Jaakko Tuomivaara.
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 Sep 13, 2026 · 2:22 AM Free
Screenshots
