Catches broken references, mixed data types, duplicate lookup keys, and formula drift in Google Sheets — in one click. Deterministic scan, no AI guess, no quota. Type =SHEETBRAIN_HEALTH() in any cell for an instant score. Schema Repair detects column moves and batch-rewrites formulas. Also generates formulas from plain English, explains and debugs errors. Free: unlimited scans + 15 AI calls/mo. Pro $9/mo for 1,000 calls. No API keys, no prompts to engineer. Works on free Gmail.
