SheetSense — Spreadsheet Error Detector

88% of spreadsheets contain errors. Is yours one of them? SheetSense is a Chrome extension that detects hidden errors in your Google Sheets and Excel Online spreadsheets — the problems your spreadsheet never shows you. Click "Scan Sheet" and get a complete health report in under 3 seconds. No data leaves your browser. 🔍 WHAT SHEETSENSE DETECTS ▸ Formula Inconsistencies — If 99 rows use SUM but one row has a hardcoded number, SheetSense catches it instantly. ▸ Silent Overwrites — When someone accidentally types over a formula and replaces it with a static value, you'll know immediately. ▸ #REF!, #DIV/0!, #NAME? Errors — Every broken formula reference is flagged with a clear explanation and fix suggestion. ▸ Circular References — Self-referencing formulas that can break your entire sheet. ▸ Mixed Data Types — Text in a number column silently breaks SUM and AVERAGE. SheetSense finds every mismatch. ▸ Data Gaps — Empty rows in the middle of your data that break formulas assuming contiguous ranges. ▸ Critical Input Cells — Cells referenced by 10+ formulas are flagged as high-impact. One accidental edit could cascade errors everywhere. ▸ Complex Formula Warnings — Mega-formulas and magic numbers get flagged with suggestions to simplify. ▸ Duplicate Headers — Column headers that repeat and can break VLOOKUP/INDEX-MATCH. 📊 HEALTH SCORE Every scan produces a 0-100 health score with letter grade (A through F) and a breakdown by severity — Critical, High, Medium, and Low. Know at a glance if your spreadsheet data is trustworthy. ⚡ HOW IT WORKS 1. Install SheetSense (takes 3 seconds) 2. Open any Google Sheet or Excel Online spreadsheet 3. Click "Scan Sheet" in the SheetSense panel 4. Get your health score and prioritized issue list instantly 🔒 PRIVACY FIRST Your spreadsheet data never leaves your browser. All analysis runs locally using rule-based detection. No data is sent to any server. No AI, no cloud processing, no tracking. 🌐 SUPPORTED PLATFORMS • Google Sheets • Excel Online (OneDrive, SharePoint)