Contact usecos.app

Send calculator bugs, source corrections, privacy questions, feedback, methodology reviews, widget requests, or partnership requests.

Verified July 29, 2026 · Typical priority: correctness, privacy, and broken links first.

Direct answer

The best contact reason is a specific correction: include the page URL, the number or claim that looks wrong, the source you are comparing against, and what you expected the calculator to show.

Scope: Corrections, bugs, privacy questions and feedback; High-impact issues include source changes, calculation errors and broken links.
Next action: Send the URL, expected result and source; Specific reports are faster to verify, test and deploy.
Not a substitute for: Personal financial, legal, tax or vehicle advice; Use the methodology and disclaimer pages to understand site limits.

Good for

Incorrect tax, GST/HST, mortgage, or VIN source data
Broken calculator results or accessibility issues
Privacy questions or data deletion questions
Editorial links to original usecos.app reports
Methodology reviews for mortgage, tax, rental, or VIN tools

Helpful links

Found a bug or have a suggestion? support@usecos.app