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 ![SheetDiff — Compare, QA](https://images.g2crowd.com/uploads/product/image/large_detail/large_detail_263a482feef884e674ea420591d32251/sheetdiff-compare-qa.png "SheetDiff — Compare, QA")
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# SheetDiff — Compare, QA Discussions

SheetDiff is a schema-agnostic Google Sheets add-on for spreadsheet comparison, structural diffing, duplicate detection, and QA reporting — directly inside Google Sheets. Designed for localization, transcription QA, financial reconciliation, data auditing, and spreadsheet review workflows, SheetDiff analyzes changes between sheets and generates professional, color-coded reports in seconds. === COMPARISON MODES === 🔍 STRUCTURAL DIFF Compare an original snapshot against an edited version with advanced change detection: • Unchanged, Modified, Added, Deleted rows • Split and Merge detection • Inline text highlighting (green additions / red removals) • Simple Mode for lightweight diffs • Positional Mode for strict row-by-row comparison • Unified Output across multiple sheets • Batch Comparison support 📊 CELL-BY-CELL COMPARISON Audit sheets at cell level: • Exact, Normalized, and Fuzzy comparison modes • Positional, Key-based, or Content-based row alignment • Header-aware column matching even when order differs • Compare formulas, notes, and data validation rules • Per-sheet statistics and aggregate scoring • Multi-sheet comparison support 🔎 DUPLICATE FINDER Detect duplicates within or across sheets: • Self-compare or cross-sheet duplicate detection • Composite key matching • Column-specific duplicate scans • Positional cell-level duplicate detection • Color-coded duplicate reports • One-click duplicate merge/removal with undo snapshots === KEY FEATURES === ✅ Schema-agnostic — works with any spreadsheet layout ✅ Auto-detect speaker, timestamp, transcript, and event columns ✅ Visual color-coded Diff Viewer with inline changes ✅ 9 QA metrics including CER, WER, SER, SegER, SACR, and Composite Quality Score ✅ Exportable QA reports for audits and reviews ✅ Snapshot workflow for version tracking ✅ Saved comparison scenarios and presets ✅ Custom regex/text transform rules per comparison mode ✅ Ignore specific columns during comparisons ✅ Cross-spreadsheet import from Google Drive ✅ Compare Picker with runtime estimation and sheet previews ✅ Chunked execution with progress tracking and resume support ✅ Unicode normalization across multiple numeral systems ✅ Optional accent/diacritics-insensitive comparison ✅ Optimized rendering for large datasets ✅ Automatic backup snapshots for undo support ✅ Fully configurable thresholds, mappings, visibility rules, and comparison behaviors === USE CASES === • Localization and transcript QA • Translation review and post-editing • Spreadsheet auditing and reconciliation • Financial report comparison • Duplicate detection and cleanup • Formula and metadata validation • Deliverable version tracking • General spreadsheet change analysis === GETTING STARTED === 1. Install the add-on 2. Open Google Sheets → Extensions → SheetDiff 3. Configure comparison settings 4. Commit a snapshot (optional for Structural Diff) 5. Run comparison and select sheets 6. Review results and export reports

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