Contact

Swiss-Knives has no backend, so there is no contact form here — a form would have to post somewhere, and that would mean a third party the privacy page does not currently name. Email is the whole of it. Messages are usually answered within a few working days.

General enquiries

Questions about the site, partnership or advertising enquiries, or anything that does not fit the categories below.

hello@swiss-knives.app

Corrections and bug reports

If a calculator returns a wrong result, a formula or default is incorrect, or an explanation is misleading, please say so. Include the tool name and the exact inputs you used — that is almost always enough to reproduce it.

feedback@swiss-knives.app

Privacy and data protection

Questions about how the site handles data, or a request under the GDPR or a comparable regime. Note that the tools transmit nothing, so there is generally no personal data held to disclose or erase — the privacy page sets out exactly what is and is not stored.

privacy@swiss-knives.app

Suggesting a tool

Suggestions are welcome. The bar is that a tool has to work entirely client-side, be useful in under a minute, and be something a developer or engineer actually reaches for rather than a novelty. If your idea clears that, send it to the general address with a sentence on what you would use it for.

What email cannot help with

Nothing you enter into a tool is stored, logged, or recoverable — not by us, not by anyone. If you encrypted something and lost the passphrase, or generated a value and closed the tab, there is no copy to retrieve. That is the intended behaviour rather than a limitation.