coderef

CodeRef Start

New product

Your start page, in every new tab

CodeRef Start puts the sites, feeds, notes and to-dos you use every day on one page, and opens it in every new tab. Use it on your own or share pages with your team. Free for 3 pages, PRO $24 a year, Team $29 a month.

  • Chrome new tab
  • Save all tabs
  • Import bookmarks
  • Team pages
  • Template gallery

CodeRef Start extension for Chrome, Edge & Brave

Free. Opens your start page in every new tab, works offline, and saves pages or all open tabs in one click.

NEWDESIGN.md Library

Design Systems of Top Brands

Drop a brand's DESIGN.md into your project and your AI coding assistant builds UI in that style — the right colors, type, spacing and components, on the first try.

Works with

  • Claude Code
  • Cursor
  • Codex
  • Gemini
  • ChatGPT
  • and other AI coding assistants
1,127 design systems
Apple, Stripe, Airbnb, Notion and every top brand, plus indie and mobile apps.
Tokens your agent can follow
Colors, typography, spacing and components, written as rules — not screenshots.
Real site screenshots
See each brand's live site next to its DESIGN.md before you pick one.
Free, no sign-up
Copy, download or curl a DESIGN.md straight into your project root.

Interactive utilities, real-time generators and compilers that run in your browser.

6:00 AM

Morning. Standup in ten minutes. Find the command you always forget.

Open Quick Reference →

Noon. Wiring up an API. Send the request, then make sense of the response.

Open REST API Client →

Afternoon. That one validation rule. Build the regex and watch every match light up.

Open Regex Tester →

Evening. Time to merge. Practise the rebase before you run it for real.

Open Git Playground →

Night. Side-project hours. Pick a dark design system and let your agent build it.

Open Dark DESIGN.md files →

Developer cheat sheets

Every method, function and command on one page, each linked to its official documentation — plus quick references, visual guides and interactive tools.

Cheat sheets (38)

A–Z directory (308)

Bold topics have a full cheat sheet; the rest link to official docs and cheat sheets.