Use it in your AI assistant

Drop your offer letter into Claude, ChatGPT, or any assistant that supports MCP, and ask what your equity could be worth. Your assistant reads the letter; our calculator does the math.

Connect it

Add a custom connector (sometimes called an MCP server) with this URL:

https://holdcommon.com/mcp

• Claude: Settings → Connectors → Add custom connector, then paste the URL.
• ChatGPT: Settings → Connectors → Create (developer mode), then paste the URL.
• Cursor, Claude Code, and others: add it as a remote MCP server using the same URL.

No account or API key is needed.

Then ask

• “Here's my offer letter. What could my equity be worth?”
• “Compare these two offers.”
• “What's the difference between my ISOs and an RSU grant?”

What gets shared

Your assistant reads the document on its side and sends only the equity numbers: share count, strike, vesting, and whatever company figures you have. The tool has no fields for your name, salary, or contact details. Each answer links to an interactive version of your numbers here, where you can adjust assumptions or get the PDF report.

Educational purposes only. Not financial, tax, or legal advice.