Built with

These are the tools and services we use to build SigmaBudgie, AI Engineer Dojo and HandOrBot. Thank you to all of them.

AI assistants

We use Claude Code and the Claude API to write and review code and to write content.

We use ChatGPT for drafts and research. The narrated reading passages in the SigmaBudgie Grade 2 tests come from OpenAI's text to speech.

We use Gemini for research and for a second opinion while we build.

Netlify hosts our sites and our forms. A new version goes live when we push to Git.

The code for every product is in a Git repository on GitHub.

Supabase stores SigmaBudgie accounts and progress. Sign-in is by magic link.

Stripe handles checkout and payments. We never see or store card details.

Resend sends our emails, for example the free practice test PDF.

Turnstile stops bots from using our free download forms. There is no CAPTCHA to solve.

jsDelivr serves the few open-source libraries our pages load.

Our sites use fonts from Google Fonts.

Search Console shows us how our sites appear in Google search.

Logos and product names belong to their owners. A company listed here does not endorse us.