WebSocket error

If you opened this as a static file, WebSockets will not work. Run the included server.

WORK

Ready

Set 1 / 1

Round 1 / 1

00:00

Mode: countdown

Workout: —

Controls

Commands are sent to the authoritative timer server via WebSocket. Clients render based on server time.

AUDIO

Sound cues

3-2-1 + transitions (client-side playback, server-driven timing)

ESP32 LED

Notify device

POST ${baseUrl}/api/timer on key events

Off

ESP32 Base URL

Your ESP32 should implement: POST /api/timer { event, payload }

Workouts

Create, save, and load interval presets. Timer uses the server as the single source of truth.

SAVED

Name

Up to 60 chars

Mode

Countdown or count-up

Work (seconds)

1–3600

Rest (seconds)

0–3600

Rounds

1–200

Sets

1–50

Tip: Display devices should open #/display for fullscreen, control-free mode.

Open on a TV/browser: #/display. Use the controller to start/pause/stop. All screens stay in sync via server time.