OneTaskContact
Email hello@onetask.tools. There is no contact form, because these pages are static files and nothing on the site posts anywhere.
What to write about
A tool that gives the wrong answer, a tool that does not work in your browser, a unit or a convention that is handled incorrectly for your part of the world, a tool that ought to exist, or a factual correction to something written on the site. Bug reports are more useful with the browser you used and the numbers you typed in.
Corrections and takedowns
If something on the site is wrong, misattributed, or uses material it should not, say so and it will be corrected or removed. Licence questions about the libraries the tools use are answered on the licences page.
Who you are writing to
OneTask is a project by REGRAVITY. Replies come from one person, so allow a few days.