Njectify

The ultimate live web customization tool: CSS & JavaScript.

Njectify is a platform for web customization, development, and automation. Inject CSS and JavaScript into any website in real time, without DevTools, without page reloads, and without interrupting your workflow. Developers, designers, QA engineers, and advanced users can use Njectify to prototype, test, debug, and customize interfaces directly in the browser. — PROFESSIONAL EDITOR Monaco-based editor (same engine as VS Code), featuring syntax highlighting, smart autocomplete, multiple tabs, automatic formatting, file search, and full project organization. — SMART INJECTION Precise control over script execution. Define where, when, and how code runs with advanced URL matching, one-click CSS element selection, and execution priority rules. — VISUAL EDITING Visual tool for quick UI adjustments without writing CSS manually. Edit colors, spacing, typography, animations, flexbox, grid, and much more! — PROFESSIONAL PROJECTS Structure projects with CSS/JS files, reusable variables, isolated execution, version history, and modular organization. — INSTANT HOT RELOAD Real-time updates without page refresh, preserving application state and speeding up testing and development cycles. — WIDE COMPATIBILITY Works with modern applications and frameworks such as React, Vue, Angular, Next.js, Svelte, and other web ecosystems. — BACKUP & SHARING Export projects in .njectify format for collaboration. Optional Google Drive sync with full user control over data and credentials. — USE CASES • UI Prototyping — validate changes before commits • Web Automation — scripts for repetitive browser tasks • QA & Testing — validation without modifying source code • Website Customization — improve everyday browsing experiences • Advanced Debugging — analyze production behavior • Product Validation — test UX before deployment — SECURITY & PRIVACY Data is stored locally in the browser (IndexedDB). No data collection. No tracking. Optional cloud sync fully controlled by the user. — COMPATIBILITY Chrome 90+ | Manifest V3 | Lightweight architecture with no external dependencies Njectify has many more use cases — install now and change the way you customize the web. 😎