A small studio, one job at a time.

onething.tools makes small, focused tools. Some are free calculators and planners that run in your browser. Others are mobile apps with one clear job, such as tracking your bills or planning shifts.

We build things we would want to use ourselves: quiet, fast and honest about what they do. Your data stays on your device wherever the tool allows it, and we only ask for an email address when a feature truly needs one.

What we make

Free tools for building, pay, time, planning and photos. Each one works without an account.

Mobile apps for specific everyday problems, released through the app stores.

Web apps that run in the browser and install to your home screen, such as Halfton for contractors.

How we work

We keep the scope small so each tool does one thing well. We publish what our apps do and do not do, and we fix problems in the open. When something is wrong, tell us and we will look at it.

Get in touch

Questions, feedback or a bug report: see the contact page.