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roadmap.sh Gives you a brutally clear learning path for roles like frontend, backend, DevOps, etc No fluff, just “learn this → then this → then this”.
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playcode.io An online playground to quickly test HTML, CSS, JS without setting up anything locally Perfect for quick experiments and debugging ideas
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usehooks.com A collection of reusable React hooks with real use cases Saves time and helps you avoid rewriting the same logic again and again
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devhints.io Concise cheat sheets for languages, frameworks, and tools. Ideal when you forget syntax and don’t want to read a 20-minute blog
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jsoncrack.com Turns messy JSON into a clean visual tree Makes understanding large APIs and configs way easier than staring at raw text
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realtimecolors.com Lets you generate and preview color palettes instantly Useful when you want decent UI colors without guessing or copying blindly
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regex101.com Build, test, and debug regex step by step with explanations Honestly, the fastest way to stop hating regex
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bundlephobia.com Shows how big an npm package really is before you install it Helps you avoid bloating your app with “tiny” libraries
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caniuse.com Tells you which CSS/JS features actually work across browsers Essential before using shiny new features in production
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toolbox.googleapps.com Google’s own diagnostics tools for DNS, email, headers, and network issues Surprisingly useful for debugging real-world problems
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