Most AI detectors hand you a confident percentage - even when the evidence doesn't support one. AI or Authentic does the opposite: it layers C2PA provenance, SynthID watermarks and its own video model, and when the signals contradict it says "not decidable" instead of inventing a number. Paste a link (TikTok, Instagram, YouTube) or upload a file. You get a calibrated result, a plain-language breakdown of what each check found, and a shareable certificate. Free, no signup.