LipSync

Measure - don't guess!

Audio / Video Sync Test Tool

Measure and visualise audio-to-video latency with frame-accurate precision — from signal generation to readout in one flow. Available on iPhone, iPad, and Android. Built for broadcast engineers, AV technicians, and live production teams.

App Store Google Play End-to-end test Tutorial

Workflow

End-to-end lip sync test

Run a complete check without extra gear: the app outputs reference flash, beep, and timecode while you measure how picture and sound line up — including camera-based capture for a true chain test on set or in the truck.

Drive the signal

Flash, audio beep, and timecode give your chain a known reference point at selectable frame rates.

Measure the path

Use the circular offset meter or Camera Measure to see delay between image and sound — in frames and milliseconds. For latency above 500 ms, enable Anchor QR on the source device and keep the code visible in the camera preview.

Confirm on site

Adjust delays in audio desk or video processor until readout hits zero — verified end to end before you go live.

Features

Every tool you need on set.

Precision modes for sync checks — from timecode to camera-based measurement — in one compact app.

Frame Offset

Visual frame-accurate sync indicator with a circular millisecond display.

Audio Beep

Precise tone generated at each sync point for acoustic measurement.

Timecode

Real-time TC and FPS display with selectable frame rates.

Flash

Visual flash marker on every beat for camera-based sync verification.

Camera Measure

Use your device camera to capture flash and beep alignment for direct on-device sync measurement.

QR Sync Anchor

Display a sync anchor QR on the pattern device so a second phone or camera can lock onto the correct beat — essential for long-latency chains.

0 ms

Precision

Frame-accurate measurement.

The circular offset meter shows audio-to-video latency from −12 to +12 frames. Instantly see whether sound arrives early or video is late — with millisecond resolution. Ideal for end-to-end checks through switchers, encoders, and display paths.

Frame Range

±12 FPS

Resolution

1 ms

Frame Rates

23.98–60 fps

Tone

880/1000/1760 Hz

Download

Measure - don't guess!

Available on iOS and Android.

No subscription. No ads. Same sync workflow on iPhone, iPad, and Android phones.

App Store Google Play