Contact us

We read everything. The fastest way to reach us is email:

What to include

If you're reporting a wrong result, please include the tool's name, the exact inputs you entered, the result you got and the result you expected — that usually lets us reproduce and fix it the same week.

Suggest a tool

Missing a calculator you need? Tell us what it should do. Many of our tools started as a single user request.

About our Android apps

For questions about a specific Android app (features, premium purchases, data), you can also use the Contact form inside the app itself — it attaches the app version automatically. All our apps are listed on our Google Play developer page.