Say what you believe.
The Devil takes the other side.
Type any opinion you hold. The Devil argues against it, out loud, in real time. A judge scores who held up and tells you exactly where your argument leaked.
A few minutes. No mercy, no insults.
The Devil is an AI opponent built for one job: finding the weakest point in what you just said and pressing on it.
Type the belief
One sentence. The thing you would defend at dinner. Pick whether you argue for it or against it.
Argue it out loud
The Devil opens against you by voice and answers what you actually said, not a script. You speak, it speaks, the clock runs.
Get the verdict
A separate judge reads the whole exchange, scores both sides, and names the claim you never backed up.
You do not know what you think until someone pushes back.
Most opinions have never been tested. They were absorbed, repeated, and liked. The Devil is the pushback you never got.
What people ask first
Does it actually disagree, or does it just sound tough?
It argues the side opposite to yours and keeps arguing it. It is not told to be nice to you and it is not told to let you win. If your point is good, it has to deal with it.
Can I argue against my own belief?
Yes. Switch "You argue" to "against it" and the Devil defends the thing you believe while you attack it. Hardest version of the exercise.
Is it voice or text?
Voice. You talk, it talks. A transcript appears as you go and the judge reads the transcript at the end.
Who is the judge?
A separate AI with a different job: read the full exchange, score each side, and point to the specific claims that went unsupported. It does not take part in the argument.
Who makes this?
The people behind Debatable, a site where strangers debate each other on video. The Devil runs on the same engine. If you want a person rather than a machine, Omegle of Debate pairs you with one.