Contact
This site does not originate loans. Use the calculators to simulate.
If a 2026 official rule diverges from our output, name the page, the inputs and the source passage. Do not send a CPF, payslip or banking screenshot.
How to write
The contact channel is the email below, also shown in the footer of every page. The @ is an image to reduce spam. To speed up a reply, include the page, the figures you typed, the result you saw and the passage of the official rule (with the link) that indicates a different result.
yoky.cai.jpgmail.com
What you can send
We accept reports of calculation or 2026 rule errors, broken links, suggestions, questions about how a calculation works and requests about your personal data, such as access, correction or deletion (see the Privacy page). Do not send a CPF, payslip, contract, bank details or internet-banking screenshots.
What we cannot do
We do not originate credit, review individual contracts, recommend banks or give financial, legal or tax advice. For complaints about a lender, contact its customer service or ombudsman first and, if needed, the Central Bank of Brazil or consumidor.gov.br. For questions about your payslip, speak to your employer’s payroll team.
What happens next
If a deviation is confirmed we fix the rules file, which applies to every calculator, and update the site’s date. We do not promise an individual reply time.