Contact
Found a number that deserves another look?
Walter Thornton maintains TradeUp Tools and welcomes specific formula, source, usability, and accessibility reports.
Useful correction report
- Calculator name and page address
- The exact inputs used
- The result shown and the result expected
- The formula, source, or practical reason supporting the change
- Browser and device if the problem is visual or interactive
Send the report
Email walt@thorntonai.tech. Do not include passwords, payment information, tax records, or other sensitive material.