Open Source · Cross-Platform

Small & Beautiful
Developer Toolkit

A minimalist and elegant desktop developer toolset, inspired by Apple design philosophy. Everything runs locally — your data stays on your device.

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Features

All the dev tools you need, in one place

Five categories — system, encoding, data, security, and calculators — 22 tools in total, each doing one thing well

System Tools

Manage your local system — port scanning, environment variables, hosts editing, all in one place

Port Manager Env Variables Hosts Editor File Renamer Rule Chains Regex Tester

Encoding & Decoding

Format conversion and text diff with JSON tree, Schema validation, XML/SQL formatting

Code Converter Text Diff JSON Tree Schema Validation XML SQL YAML TOML Image Base64

Data Conversion

Generators and quick references — mock data, status codes, QR codes, and more

Color Converter WCAG Contrast UUID Mock Data HTTP Status Codes Dev Reference QR Code Generator Connection String

Password & Keys

Passwords, JWT, hashing, and certificate parsing — all computed locally

Password Gen Passphrase JWT Sign/Verify Key Pair Gen Hash Text/File Certificate Parser

Calculators

Visual Cron editor, IPv4/IPv6 subnet with VLSM splitting, and Chmod permission conversion

Cron Parser Subnet Calc VLSM Split Chmod Calculator
Preview

Clean and elegant experience

Following Apple design guidelines, every interface pursues intuition and aesthetics. Three representative screenshots below — see the feature grid above for all 20 tools.

Port Manager (Light) Port Manager (Dark) Port Manager
Code Format Converter (Light) Code Format Converter (Dark) Code Format Converter
Settings (Light) Settings (Dark) Settings
Philosophy

Why Dev Tool Kit

Small & Beautiful

Each tool page focuses on doing one thing well. Search and aggregated entries avoid duplication, keeping the sidebar clean.

Local-First

All features run entirely locally with no network connection required. Your data always stays on your device — privacy guaranteed.

Elegant Experience

Following Apple Human Interface Guidelines — clean interfaces, smooth animations, and intuitive operations.

Language Support

Full bilingual support (Chinese and English) with seamless in-app language switching for developers worldwide.

Quick Start

Get started in seconds

Clone the repo, install dependencies, and launch the dev server

git clone https://github.com/blueWhalei/dev-tool-kit && cd dev-tool-kit && pnpm install && pnpm dev