After each pull, Barista Coach sends your shot data to Claude (Anthropic's AI) and streams back a personalized 3–5 sentence coaching note — specific grind numbers, what's causing the taste issue, and the single most important thing to fix next. It reads like advice from a knowledgeable friend, not a checklist.
Cost: ~0.2¢ per pull ($0.002). Uses Claude Sonnet via the Anthropic API — you need your own key.
Get a key at console.anthropic.com → API Keys. Set a spend limit to protect yourself — $1 covers ~500 pulls.