NeverPromptedCleans up your own writing on your device and shows you what a detector would measure in it. It cannot guarantee defeating a model vendor's undisclosed watermark; nothing here is sent to a server, on any tier.
Checking someone else's work for AI use is a different job. Learnaway does that. NeverPrompted is for writing you wrote yourself, not work someone else handed you to submit.
A detected mark is not proof of authorship. An absent mark is not proof of human authorship. NeverPrompted reports what it measured and names what it could not measure.