DevToolBox

What it does

75+ developer tools running entirely in your browser. JSON formatter & diff, Base64, regex tester, color tools, CSS utilities, and more. No signup, no server-side processing, no ads. Bilingual (EN + JP). Free forever.

日本語ネイティブ対応の無料開発ツール集。JSON整形、正規表現テスト、全角半角変換、元号変換など100+ツール。全処理ブラウザ完結・API対応。

TOML to JSON, JSON to TOML. Cargo.toml, pyproject.toml, Hugo config validation and conversion OpenAPI (Swagger) specification visual viewer. Browse endpoints, parameters, and responses プロジェクトタイプを選択して.gitignoreファイルを生成。Node.js・Python・React・Rust等14テンプレート対応 Schema.orgfrom usedevtools.com

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  DevToolboxFeb 2026 · devtoolbox.yashnandvana.in · ▲7

  150+ Free Developer Tools in One Place

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  DevToolBoxJun 2026 · devtoolboxes.net · ▲3

  24 private, browser-based tools for developers

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  QuickDevJun 2026 · quickdev.cc · ▲2

  19 free developer tools — all client-side, no tracking

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  NicheUtils: 40+ Free Dev Tools 2025 · nicheutils.com · ▲9

  40+ dev tools that run 100% in your browser - no servers

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  DevBoxMay 2026 · devbox-green.vercel.app

  35+ free developer tools. All in-browser, no signup required

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  DevTabJul 2026 · devtab.in · ▲5

  110+ dev tools. One tab. Zero server calls.

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  /dev/null▲481

  a social network for devs

  Dev tools · 2d ago · dev-null.sh

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  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 27d ago · github.com

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  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 25d ago · github.com

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  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 22d ago · openbot.run

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  Talanoa▲341

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

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  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

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  Lightfield▲901

  AI-native CRM that builds itself and does work for you

  AI · Mar 2026 · lightfield.app

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  Tobira.ai▲728

  A network where AI agents find deals for their humans

  AI · Mar 2026 · tobira.ai

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  Claude Import Memory▲716

  Switch from ChatGPT to Claude with import memory feature

  AI · Mar 2026 · claude.com

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  Littlebird▲709

  Littlebird remembers everything across your meetings, messages, docs, and apps, then takes action so you can recall any detail and never lose context.

  AI · Mar 2026 · littlebird.ai

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  Viktor.com▲702

  Your AI Coworker that proactively executes tasks

  AI · Mar 2026 · viktor.com

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  Jupid▲659

  File your taxes with Claude Code

  Commerce · Mar 2026 · jupid.com