A
One is human. One is a machine.
Five pairs a day. Pick the machine, then point at the sentence that gave it away.
Caught it
Right, wrong sentence
Fooled
1 / 5
—
Which one was written by the machine?
B
Right. Now tap the one sentence that gave it away.
0/5
Everyone today
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What TELL is
A poker player’s tell is the small habit that gives the hand away. Machines have tells too.
The human texts are public domain or Creative Commons and every one is credited after you answer.
Questions people ask
How do you play TELL?
Read the two texts, tap the machine, then tap the sentence that gave it away.
When does a new set come out?
Every day at 00:00 UTC.
Who wrote the texts?
The human half is credited on screen; the machine half was written for TELL by language models.
Made by TJ NOVA LTD, London. Texts curated and machine halves written by Claude. First set published 3 September 2026.