Arpie vs Syntheremin

Bouncing balls turn into music! Arpie is a novel musical app that allows anyone to enjoy music. Put balls as many as you like, them watch them playing a beautiful melody. Higher balls hit the keys with long pauses, and lower ones hit them fast and repeatedly. By combining them, you can easily create a wide variety of musical sequences.

Play the air. Syntheremin Instrument turns the space in front of your iPhone into a continuous musical instrument. Move both hands through the camera view to perform without touching the screen. PLAY CONTINUOUS PITCH Move your dominant hand horizontally through the note field. Raise or lower it to keep gliding smoothly across octaves—without the steps of a keyboard. CONDUCT THE VOLUME Raise your other hand to swell and lower it to quiet. Keep it still for a steady level, or close your fist for an immediate mute. SCULPT THE SOUND Roll your pitch wrist to sweep an analog-style filter. Roll your volume wrist to move from dry and focused to wide with a short echo. BUILD HARMONIC THREADS Touch matching fingertips to layer an octave, scale third, scale fifth, or high shimmer. Stretch the glowing connections to intensify them, then pinch a connected finger to release its voice. MADE TO BE PLAYED • Classic, Choir, and Glass synth characters • Scale-based note gravity that helps intonation while preserving glides • Live pitch lanes, note readout, and tuner • Role-colored hand tracking that shows what the instrument hears • Right- and left-handed layouts • No account, ads, or microphone access PRIVATE CAMERA PROCESSING Camera frames and hand landmarks are processed on the iPhone and are never saved or uploaded. The bundled Google MediaPipe SDK sends limited usage and performance metrics to Google; details are available in the in-app Privacy screen and privacy policy. REQUIREMENTS Syntheremin Instrument requires an iPhone with a front TrueDepth camera—the hardware used for Face ID. For the most responsive playing experience, use the built-in speaker, wired audio, or low-latency headphones.