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Theremin Synth: Spooky Sci-Fi icon

Theremin Synth: Spooky Sci-Fi

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Spooky theremin you play with your fingers: smooth glide, no clicks, no camera

Price
Free
No in-app purchases
Updated
Oct 10
2026 · v1.0.1
Get it onGoogle Play See alternatives

Screenshots

  • Theremin Synth: Spooky Sci-Fi screenshot 1
  • Theremin Synth: Spooky Sci-Fi screenshot 2
  • Theremin Synth: Spooky Sci-Fi screenshot 3
  • Theremin Synth: Spooky Sci-Fi screenshot 4
  • Theremin Synth: Spooky Sci-Fi screenshot 5
  • Theremin Synth: Spooky Sci-Fi screenshot 6
  • Theremin Synth: Spooky Sci-Fi screenshot 7

About Theremin Synth: Spooky Sci-Fi

Theremin Synth turns your phone into a vintage electronic theremin. Slide your right finger across the pitch field and the note glides smoothly with no steps, zipper noise or clicks. Your left finger controls the volume, and lifting your finger goes silent instantly. Perfect for spooky Halloween sounds, haunted house ambience and sci-fi effects, and it stays a real instrument all year.

How to play

- Right hand: slide left for low notes, right for high notes. Pitch is fully continuous, just like a real theremin.
- Left hand: move up for louder, down for softer.
- Wiggle your finger for natural vibrato.
- Tilt mode: tilt the phone forward and back to change the pitch while you hold the screen.

Key Features

- Six sounds: Classic, Pure Sine, Vintage Tube, Sci-Fi, Haunted and Soft Flute. Each one is synthesized on your phone.
- Haunted sound with wide vibrato, hall reverb and chorus, plus a soft purple fog on the panel.
- Scale snap: off, semitone, major, minor or pentatonic. The pull strength slider keeps the glide smooth instead of jumping between notes.
- Range of 2, 3 or 4 octaves with octave shift.
- Auto vibrato, room or hall reverb and echo.
- Tuner-style display with note name, cents and frequency, plus a mini oscilloscope that shows the waveform of each sound.
- Note names as C D E, Do Re Mi or German H.
- Guide songs: follow the glowing dot to play The Swan, In the Hall of the Mountain King, Danse Macabre, Gymnopédie, Swan Lake and Greensleeves. Tap Listen to hear a demo, and set the tempo from 50 to 120%. All melodies are public domain classics.
- Large mute button, volume limit and hearing warning. Sound stops when the app goes to the background.
- Wooden cabinet design with brass antennas and a warm tube glow, light and dark themes, large text and screen reader support.

Good For

- Spooky theremin sounds for Halloween parties and videos
- Sci-fi and retro electronic sound effects
- Trying the feel of a theremin before buying a real one
- Synth fans and anyone curious about this classic instrument

No time limits and nothing is locked. No microphone, no camera and no account needed. Works offline.

What’s new

Version 1.0.1 · Updated October 10, 2026

Fixed reverb sometimes turning off, sound not returning after switching apps during startup, and smoother playback on more phones.

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