Contact

Write to Julien Kollmann about 1rm.dev, a cited formula, the public API, or the MCP server. Email hi@julien1k.com. Post reaches Wolf-Huber-Straße 30, 94032 Passau, Deutschland. That is the same address as the Impressum.

Use this contact for a correction to a method card, a broken endpoint, or a question about how an estimate was produced. Calculator inputs are not stored against an account, so there is no password to reset and no login to recover. Privacy requests use the same inbox. The English privacy page is /privacy. The German statutory privacy note is /impressum#datenschutz.

There is no phone line and no contact form. Email is the path that reaches the person who runs the site. The public API does not need a key, and it does not have a support token. If an agent is unsure whether 1rm.dev is the right tool, read /llms.txt before calling it.