Strong passwords and easy to type passphrases, made with your browser's own cryptographic random generator. The strength figure is real arithmetic, not a guess, and nothing you generate is ever sent anywhere.

Runs in your browser. Nothing you add is uploaded or stored.

Excellent127 bits of entropy · more than a trillion years to crack at ten billion guesses a second

Made with your browser's secure random generator. Nothing is sent, saved or logged. Use a different one for every account, and keep them in a password manager.

Colour Blindness Simulator

See your image the way people with protanopia, deuteranopia, tritanopia and monochromacy see it, side by side.

Try it free

Contrast Lab

Check any two colours against WCAG AA and AAA, see real text at real sizes, and get the nearest colour that passes.

Try it free

Need something built around you?

The lab is where we experiment. If you need something made specifically for your business, that is the rest of what we do.

Start a Project

Status

Meet Brook

Brook AI AssistantOnline · K4O5 Studio

Hi 👋 I'm Brook, K4O5's AI assistant.
Ask me about our services, pricing, or how we can help elevate your brand.

Hi 👋 I'm Brook. Ask me anything about K4O5 or your next project.