Compare two .env-style files by variable name and see missing, extra and shared keys without showing secret values.
This tool is for deployment reviews where `.env.example`, staging and production files drift apart. Paste two environment files and compare variable names while values stay masked in the report.
What it reports
The checker ignores blank lines and comments, extracts variable names from `KEY=value` or `export KEY=value` lines, and lists keys that appear only on one side or both sides.
Privacy
Environment files often contain secrets. This calculator runs locally in the browser and reports names, not raw values.