About Simone & Juan
Simone & Juan builds small, free online tools that answer one question well, without accounts, downloads or clutter.
What we do
Every tool on this site solves one everyday problem: a calculation, a conversion, a quick check. Each one runs entirely in your browser and gives you the answer along with the formula behind it.
Alongside the tools we publish short guides with worked examples, so you understand the result rather than just reading it.
How we keep it free
The site is funded by advertising. Ads never change the results a tool produces, and we never sell your data.
Accuracy
We test every calculator against known examples and fix mistakes as soon as they are reported. If a result looks wrong, tell us and we will check it.
Who runs this site
Simone & Juan is published by the organization below. Questions, corrections and requests go to hello@example.com.
- Simone & Juan
Editorial policy
Every tool is tested against known values and worked examples before it is published, and again whenever its formula or inputs change. The date of the last check is shown under the tool.
Articles are written or reviewed by the named author. Where an article covers health, money or safety, a qualified reviewer checks it and is credited on the page.
We may use software, including AI tools, to help draft or edit. A person checks every published word, and nothing is published without that review.
If you find an error, write to hello@example.com. Corrections are made on the page and its "updated" date changes.