Design+Code 4
Design and code web and mobile apps with React and Swift
Design+Code 4 launched on October 15, 2020 with 259 votes, #87 of 4,018 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 6 years on.
In plain words
Design+Code 4 is an online learning platform offering over 30 premium courses and 100 free tutorials covering design and web/mobile app development with React and Swift. The platform provides 120 hours of video content, certificates upon completion, and includes features like quick search and automatic light/dark mode. It serves developers and designers looking to build practical skills in modern app development across multiple platforms.
written from the facts on this page · September 2026
From the sources
Say hello to Design+Code 4 with over 30 premium online courses for learning design and code with React and Swift. V4 has been completely redesigned with over 100 free tutorials, 120 hours of video, certificates, quick search and automatic light/dark mode.
Get 300+ hours of training with templates, prompts, source code, downloadable videos, and AI chat for polished user interfaces and apps.
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21st.dev2025 · 21st.dev · ▲1,211I originally built this app to organize and reuse interesting React + Tailwind components I came across on Twitter, inspired by the shadcn/ui approach. Later, a friend started contributing their own components, and it got me thinking—this could grow into something bigger, like an NPM for design engineers to share and use components. Would love to hear your thoughts!
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I made this because building UIs in a lexical medium like code is super annoying. I have to pre-render what I’m making in my head, and then jump between the browser and IDE to test. I was inspired by the developer console in chrome and safari since I end up editing css there because it’s ironically more convenient. Hope it’s useful!

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