Support

Getting help

The fastest way to reach a person is email: velozjuan1803@gmail.com. All seven apps and this website are built and maintained by Juan Antonio Veloz Gutierrez, so your message goes straight to the developer.

If you are reporting a wrong answer, please include the numbers you entered and the result you expected. That is usually enough to reproduce and fix an issue the same day.

Subscriptions and refunds

PRO subscriptions are billed by Apple or Google, not by this site. To cancel, open your account settings in the App Store or Google Play and manage subscriptions there.

Refunds are handled by the store you bought from — Apple through reportaproblem.apple.com, Google through the Play Store order history.

Suggesting a calculator

Requests for new calculators are genuinely welcome, and several of the existing ones started as user suggestions. Send an email describing the kind of problem you need solved.