PostPilot for X

PostPilot lives inside the X composer and scores every post as you type — hook strength (20 hook types), specificity, and 79 engagement-killing patterns, caught while you can still fix them. Free forever; Pro ($5/mo) learns your voice across 13 dimensions, scores threads, and turns viral posts in your feed into lessons. Everything runs locally — no servers, no data collection, your own Claude API key.