Get in touch —
we actually reply.

We read every legitimate email personally and reply within 48 hours, usually faster. Whether you have a question about a calculator, a correction to a fee structure, a suggestion for a new tool, or a story about how a calculator helped your business, we want to hear from you.

Send us a message

We reply within 48 hours

Your name

Email address

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Your email client will open with the message pre-filled. We never share your email with third parties.

Direct email

For all inquiries — questions, corrections, suggestions, partnerships.

contact@1one.shop

Response times

●General questions: within 48 hours
●Fee corrections: reviewed within 2 weeks
●Bug reports: acknowledged within 24 hours
●Partnership inquiries: within 1 week

Before you email

Many common questions are answered in our FAQ on the homepage. Quick links:

Reporting an error

If you spot an incorrect fee or outdated rate, please include in your email:

The specific calculator URL
The specific input or output that is wrong
The correct value with a source link
The date you noticed the error

We review every correction and update within two weeks for material errors.

Get in touch —we actually reply.

Send us a message

Get in touch —
we actually reply.