I built a free AI tell detector after my own Reddit account got 2 'all comments are AI generated' callouts in one day

In 24 hours my Reddit account picked up: 3 ModTeam removals 2 public callouts of "all comments are AI generated" 1 "Calm down with your AI responses. Your credibility goes down hard if you can't formulate sentences on your own" I was running everything through Claude. Clean writing. The mods spotted it in seconds. So I sat down and mapped the patterns. the 12 most reliable AI tells em-dash (—) . The single strongest tell. Real people on Reddit use commas and periods. AI loves the em-dash. "del