Developer Launches 47 Browser-Based Dev Tools With No Signup or Data Tracking

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A developer has built KRUMB.DEV, a free collection of 47 developer utilities that run entirely in the browser without sending user data to any server. The platform covers tools for formatting, encoding, generating, testing, converting, and network diagnostics, including JSON formatters, JWT decoders, regex testers, and DNS lookups. No account creation is required, and sensitive inputs such as passwords, JWTs, and source code never leave the user's device, except for tools like DNS and SSL checks that inherently require a network call. Built with Next.js, TypeScript, and Tailwind CSS, the project is open source under the MIT license and available on Vercel. The developer states the roadmap will focus on utility rather than monetization, with more tools planned based on common developer needs.

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