Found a bug, want a new feature, or have a blog topic to suggest? Send it our way. The team is small but we reply.
Click the address above to open your email client with a fresh message ready to send. Or copy it into your usual email tool. We read every message and reply to almost all of them — usually within 48 hours.
For most messages. Bug reports and outages get priority.
Yes, really free. The site runs entirely in your browser — there's almost no operating cost. We run banner ads and Google Analytics to cover hosting and keep the toolkit free for everyone. We don't sell your data. The best way to support the site is to share it with other engineers who'd find it useful.
No. All calculations happen in your browser via JavaScript. We don't have a backend that receives your inputs. The only things stored locally (in your browser's storage) are lesson progress and quiz streaks, and those never leave your device.
By design. The AI Assistant runs entirely in your browser using a rule-based natural-language parser. This means your network design never leaves your device — which matters when you're sketching out internal infrastructure. It trades off some sophistication for full privacy and zero latency.
Yes, with the usual caveat: review and test before applying. The generated code is syntactically correct and follows standard patterns, but every environment has specifics (tags, modules, naming conventions) the generator can't know about. Treat it as a starting point.
Not for the calculators, exports, or Learn Center — those stay free. If we add anything paid in the future, it'd be optional advanced features (team workspaces, audit reports for compliance, custom branding for educators), never things that gate the core tools.
Share the link with engineers, post it in your team channel, link to it from your blog or documentation. Word of mouth is what keeps this alive.