Truetone · voice check

Is that voice real.

Send any clip. Get human or AI, with a confidence, for every six seconds of audio, usually in well under a second. Audio is never stored.

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EVERY 6 s
< 1 s
NEVER STORED
Try it

Record a voice, or upload a clip.

Up to 15 seconds. You get Truetone’s verdict: human, AI, or can’t tell.

Your audio goes to our API to be checked and is not stored by this demo.

Where it matters

A cloned voice is one phone call away.

Tap a row above to hear the clip. The labels are the true answers for these clips from the detector’s own test set; it flags our own Overtone voices as AI too.

Call centres

Flag a synthetic caller before the account changes hands.

Voice login

Add a liveness check to voice biometrics.

Moderation

Label AI voices in uploads, ads and podcasts.
How well it works

Every vendor, including us.

Truetone is not a check for one company’s audio. Its test set includes ElevenLabs, Cartesia and our own Overtone, and it is built for the hard case: AI audio played through a speaker into a microphone.

98%
of replayed AI caught from engines it was trained on
89%
caught on average from engines it has never heard (70 to 99% by engine)
0.3%
of clean real-voice files flagged; 3 to 5% of real voices played through speakers

Whispery or quiet voices are flagged more often. Treat the score as one signal, not proof. The score comes with every Undertone transcript as p_human.

Know who’s really speaking.

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