Sherlock & Co

People get forwarded photos, voice notes and screenshots of text every day, and there's no easy way to tell if AI made them. The detectors that exist give you a percentage and no reason, and they sound confident even when they're guessing. Sniff is a WhatsApp contact and a web app. You forward it a photo, voice note, video or paragraph of text, and it replies in a few plain sentences: likely AI, no AI signal found, declared AI (the file carries its own AI label or watermark), or inconclusive. Every answer comes with the evidence behind it. It checks provenance first: C2PA credentials, invisible watermarks and generator metadata. Only when there's no label do calibrated detectors vote. Our code makes the verdict and the language model only explains it, so a confident-sounding reply can never contradict the evidence. On held-out text, 96.5% of our "likely AI" calls and 97.8% of our "no AI signal" calls were right. When the signals don't agree, Sniff says it can't tell instead of guessing. Everything is open source, and detection runs on your own machine. Try it: - WhatsApp: message +91 99254 85601 (https://wa.me/919925485601). No sign-up. Forward a photo, voice note, short video or a paragraph of English text (about 110 words or more). - Web: https://sniff.brewlogic.tech. Create an account in a few seconds, then drop in a file or paste text.