Free tools
Browser-based tools I built and keep free to use. No signup, nothing to install.
Live HTML, CSS & JS Editor
Write HTML, CSS and JavaScript and see the result instantly in the browser.
Online React Compiler
Write and run React components with JSX online, with a live preview.
UK Nursery Profit Calculator
Estimate revenue, costs and profit for a UK childcare nursery and export a PDF report.
Need a calculator or tool on your own site?
A good calculator answers a customer's question and collects leads at the same time. I build custom tools like these for business websites.