Tools that respect your time and your data.

Luminus Tools is a single, fast index of everyday calculators, converters, and developer utilities. No account, no upload step, no waiting on a server — every calculation runs in your browser, so what you type stays on your machine.

The one exception is Echo, the assistant. When you ask it to explain a result or pick a tool, just that message is sent to a language model and the reply comes straight back. Nothing is stored between visits.

It’s built to stay out of your way: a quiet, monochrome page where the only splash of color is the highlighter mark on the thing that matters right now.