Swingtone: Pendulum Waves

Swingtone is a pendulum wave that plays music. Glowing balls swing at slightly different speeds, each one plays a note when it strikes, and at the end of every cycle they all come back into one line.

How it works

- Pick a ready pendulum wave or a classical piece, or tap Surprise me, then press play.

- Each ball plays its note when it strikes, so the pattern you see is the music you hear.

- A countdown shows when the balls line up next. When they do, the screen lights up with a flash, sparks and a ring of light.

- Change the balls, tempo, cycle, scale, instrument, colours or background, and hear and see each change at once.

- Save your wave or share it as a video, audio or MIDI file.

Features

- Up to 128 balls, a tempo from 0.1 to 200 strikes a minute, cycles from seconds to hours and a base note from C1 to C7.

- 11 instruments: marimba, piano (a real recorded grand piano), celesta, kalimba, jal tarang, synth, handpan, music box, vibraphone, harp and tubular bells.

- 15 scales: major, minor, pentatonic, fifth plus major or minor, chromatic, quarter tones, one tone, dorian, lydian, blues, whole tone, hirajoshi and hijaz.

- Classical pieces: 16 works by Chopin, Bach and Mozart, such as Eine kleine Nachtmusik. The balls play the melody in the rhythm of the score or of the wave.

- 11 animations: pendulum, half disc, disc, bounce, spiral, carousel, tunnel, 3D orbits, wave, kaleidoscope and strings.

- Neon gradients, rainbows, twenty solid colours and flowing colours.

- Backgrounds: night, deep sea, dusk, starry night and aurora, with light trails.

- 25 ready waves in five sets for sleep, calm, rhythms, cosmos and classics, such as Lullaby, Galaxy and Northern lights.

- Surprise me: a new wave that always sounds good.

- Your own waves: save, rename and duplicate them.

- Export a video (tall or wide), audio (M4A or WAV) or a MIDI file and share it.

- Background playback with controls on the lock screen.

- Sleep timer of up to 90 minutes that fades the music out gently.

- Live wallpaper: your pendulum wave moving on the home screen.

- Tap a ball to hear its note, double-tap for full screen.

- Portrait and landscape.

- Vibration when the balls line up or at every strike, if you want it.

What people use it for

- Sleep music: start a calm wave, set the sleep timer and drift off.

- Relaxing music and a quiet visual meditation after a long day.

- Watching the classic physics demonstration of swinging pendulums, with sound.

- Making pendulum music videos to share with friends.

- A slow, glowing live wallpaper.

Press play and watch the pendulum wave come back into one line.