Calliope

Calliope

Find the one.

A rhythm trainer for dancers. Pick a song, and Calliope maps its beat right on your device — then the 8-beat ring and 32-beat phrase map glow as you tap to find where the 1 lands.

In development
Email me at launch

No list, no newsletter — just a note from a person when it ships.

How it works

Three steps to the one

No metronome, no click track, no counting along to a fixed tempo. Calliope listens to the actual song and builds a map of where its beats really fall.

  1. Add a track

    Pull in audio from your phone or Drive, or browse the built-in free music library. Your own songs work exactly like the bundled ones.

  2. Calliope maps the beat

    A neural beat tracker runs in the background, entirely on your phone, finding every beat and downbeat. Nothing is uploaded. Your microphone is never used.

  3. Tap the one

    The count runs live against that map. Tap where you think the phrase resets — then see exactly how far off you were, beat by beat.

What's inside

Built around real songs

Every score is measured against the track's own analyzed beat map — not an assumed tempo and not a fixed phrase length.

On device

Real beat detection

Calliope runs the Beat This! beat-and-downbeat tracker (CPJKU, ISMIR 2024) locally through ExecuTorch. No server round trip, and no network needed to analyze.

The count

Ring and phrase map

An 8-beat ring for the count you dance to, and a 32-beat phrase map above it so you can see where you are in the larger structure of the music.

Modes

Count, Distance, Locate

Follow the count out loud, guess how many beats until the next 1, or find the 1 cold with no announced target.

Sessions

Fixed ten or endless

Take a tight ten-round set when you have a few minutes, or leave it running endlessly and keep drilling while the track plays on.

Library

Your music, or ours

Add audio files from your phone or Drive, or search the built-in catalogue of freely licensed tracks. Analyzed beat maps are cached, so a track is only mapped once.

Progress

Scores that stay yours

Accuracy, timing and streaks are tracked across sessions — stored on your device only, with no account to create.

A look inside

Dark, quiet, and built to be glanced at

The interface stays out of the way while you're moving: big counts, soft glow, and nothing that needs reading mid-phrase.

Start Calliope's start screen
Choose a track and a mode
Analyzing Calliope analyzing a track on device
The beat map is built on your phone
Trainer The 8-beat ring counting during a session
The 8-beat ring, counting live
Reveal The reveal showing how close a tap landed
See exactly where your tap landed
Stats Session statistics across practice sessions
Progress across sessions

Nothing about you leaves your phone

Calliope has no accounts, no ads, and no analytics or tracking SDKs. Beat detection runs locally, and your scores and settings are saved on your device — they're gone when you uninstall.

  • No account
  • No ads
  • No analytics
  • No microphone
  • No trackers
Read the privacy policy