Sheet Merge Check
A narrow Google Sheets add-on that merges selected tabs with the same or similar headers and produces a check report (row counts, header mismatches, exact duplicate rows, and blank key fields).
Developer
Wu Hang, an individual. Contact: hwu121380@gmail.com.
Status
This site hosts the privacy policy and terms for the add-on. The add-on is not listed on the Google Workspace Marketplace yet. Paid Pro checkout is not live.
How it handles data
The add-on runs inside the spreadsheet where you install it, using Google Apps Script. It reads and writes only that spreadsheet. It does not send your sheet data to a server operated by Wu Hang. This matches the current source in src/.
Policies
Source
Prototype source is in the src/ folder of this repository, under the MIT License. The merge-and-check logic is adapted from the MIT-licensed csv-merge-check command-line tool.