Seen on a thousand slides

People remember 10% of what they read and 90% of what they do.1

1 Contradicted. “As a memory researcher myself, I’m afraid this just isn’t true.” Source: University of Strathclyde, strath.ac.uk

Nebius × NVIDIA Global AI Hackathon · Berlin

Sayproof1

Fact-check your talk before your audience does.

1 NVIDIA Parakeet + Nemotron on Nebius Token Factory, with live evidence from Tavily.

The problem

Your audience has a phone. And Google.

Students with a presentationFounders with a pitchSpeakers at a conferenceAnyone giving a speech

How you sound

Pace, filler words, energy. What you usually rehearse.

What you claim

Your facts, checked against the web, with a source you can put on your slide.

One rehearsal, four claims

take 1 · 0:21 · 4 claims found1 outdated · 1 contradicted · 1 supported · 1 can't verify
00:02
“Pluto is our ninth planet.”Reclassified as a dwarf planet in 2006. Source: IAU Resolution B5 (2006)
Outdated
00:06
“You can see the Great Wall from space.”Not visible to the naked eye from orbit. Source: Britannica
Contradicted
00:11
“Octopuses have three hearts.”Two pump blood through the gills, one through the body. Source: Britannica
Supported
00:17
“Our users tripled this year.”Private data: no public source. Add your own citation.
Can't verify

Example receipt. Try it with your own text at sayproof.vercel.app

The loop

  1. RehearseTalk out loud, or upload a recording.
  2. InspectEvery claim gets a verdict and the quote behind it.
  3. CorrectTake the suggested line, with its source.
  4. Re-rehearseTake two comes back clean.
Take 1
Pluto is our ninth planet.
Take 2
Pluto was our ninth planet, until 2006.1

How it works

NVIDIA Parakeet
TranscribeSpeech to text with word timestamps.
Nemotron · Nebius
ExtractOnly checkable claims, not opinions.
Tavily
SearchLive web evidence for each claim, in parallel.
Nemotron · Nebius
VerdictSupported, contradicted, outdated, or can't verify.

No source, no verdict.

Sayproof

Check your facts before your audience does.

Say it with sources. Try it: sayproof.vercel.app

NVIDIA ParakeetNVIDIA NemotronNebius Token FactoryTavily