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Questions, bug reports, partnership ideas or a tool you wish existed. Send us a message and a real person will reply.

We aim to answer within two business days.

Tell us what you work out by hand. Popular ideas get built first.

Include the tool, what you entered and what you expected to see.

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Before you write

Are Dueter tools really free?

Yes. The core tools are free with no account and no usage limit.

Do you store what I type into a tool?

No. Calculations run in your browser, and we never store or log what you enter.

Can I suggest a new tool?

Please do. Use the form and tell us what you need to work out and how you do it today.

Can I use your results in my own documents?

Yes. Results are for guidance, so always check them against the terms in your own contract.