SheetDiff™
Compare, QA
SheetDiff™ is a schema-agnostic Google Sheets™ add-on built for spreadsheet comparison and quality assurance. It compares two versions of any structured data — the original and the reworked — and produces a detailed, row-level diff report.
Comparison Modes
Structural Diff
Row-level comparison with advanced algorithms to detect splits and merges across your data rows.
Cell-by-Cell
Column-aligned granular comparison for pinpointing exact character or formatting changes.
Duplicate Finder
Scan massive datasets instantly to detect and highlight duplicate rows within a single sheet.
Who Uses SheetDiff™?
Subtitle & Transcription QA
Compare original and edited subtitle or transcript files row by row. Measure accuracy with Word Error Rate (WER), Character Error Rate (CER), and Sentence Error Rate (SER).
Localization & Translation Review
Track changes across translated spreadsheets with multi-script normalization — supporting Arabic, Cyrillic, CJK, Thai, Devanagari, and more.
Data Quality Assurance
Validate dataset integrity between two versions. Every modification, addition, deletion, split, and merge is automatically categorized and color-coded.
AI Output Evaluation
Compare AI-generated or machine-translated content against a human reference with WER/CER metrics — ideal for evaluating LLM and MT model accuracy.
Spreadsheet Version Control
Commit a snapshot, make edits, then run the diff — a lightweight version comparison workflow entirely within Google Sheets™.
How It Works
Open any spreadsheet in Google Sheets™
The add-on auto-detects column roles (speaker, timestamps, transcript, sound events)
Commit a snapshot of the original data
Make edits or import the reworked version
Run the diff — every row is categorized and color-coded
Diff Categories
- Unchanged — identical rows between versions
- Modified — rows with text or timing changes
- Split — one original row split into multiple
- Merged — multiple original rows merged into one
- Added — new rows in the reworked version+
- Deleted — rows removed from the original-
Key Features
- Schema-agnostic — works with any column layout
- Auto-detect column roles via flexible header pattern matching
- Color-coded Diff Viewer sheet
- Summary QA Report with per-category counts and WER/CER/SER metrics
- Configurable similarity threshold
- Multi-script normalization (Arabic, Cyrillic, CJK, Thai, Devanagari, Bengali)
- Optional reviewer and transcriptionist metadata
- Settings sidebar for full control
Pricing
See full details on the Pricing page.
Privacy & Security
Your spreadsheet data stays in Google Sheets™ — it is never transmitted to external servers. The only data sent to our license server is your Google account email, solely for license verification and usage tracking. Payments are handled by Dodo Payments (Merchant of Record). No cell content, row data, or file contents ever leave Google’s infrastructure.
Get in Touch
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