Free interactive tool
Speaking Lab
Speak into your microphone and watch your voice in real time. The orange line is your tone (pitch and intonation); the shaded band is your rhythm (loudness and emphasis). Everything runs in your browser — nothing is recorded or uploaded.
Say this sentence
“I live in London.”
Statement — let your pitch drop on the last word.
Press “Start speaking” and allow microphone access.
How it works
Your browser captures the microphone with the Web Audio API and runs an autocorrelation pitch detector on each frame to find the fundamental frequency of your voice — that's the orange tone line. Loudness comes from the signal's energy (RMS). When you stop, the Lab compares the end of your sentence against its body to tell whether your intonation rose or fell, and measures your pitch range so you can hear how expressive (or flat) you sounded.
Privacy: this is a 100% client-side tool. No audio is sent anywhere, and nothing is saved.
Frequently asked questions
Is my voice recorded or uploaded?
No. All analysis runs in your browser using the Web Audio API. Your microphone audio never leaves your device and nothing is stored or sent to a server.
Why does it ask for microphone access?
The tool reads your live microphone to measure pitch and loudness. Your browser will ask permission the first time — you can revoke it any time in your browser settings.
What does the graph show?
The orange line is your pitch (tone/intonation) over time on a musical scale. The shaded area at the bottom is your loudness, which reflects rhythm and emphasis.