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Instantly & Securely
30+ professional tools. 100% local. Zero latency.
Stop Installing 10+ Dev Extensions
Design, SEO, Debugging, Testing, and Security — all inside one powerful, unified toolkit.
Traditional Workflow
Multiple installs. Different UIs. Slower workflow.
With Devsy
One seamless, integrated development experience.
Your entire website testing workflow — in one extension.
What's New in v2.0.0
Released February 2026 · Packed with powerful new features
Smart Form Filler
Auto-fill with millions of realistic data combinations
28 Device Presets
Test responsive designs on any screen size
Complete SEO Suite
8 professional tools for technical audits
Advanced Design Tools
Color picker, fonts, contrast checker & more
Why Devsy is Better
Most extensions rely on external servers. Everything in Devsy happens locally in your browser, ensuring maximum security and zero latency.
Professional JSON formatting, JWT decoding, and Base64 tools built for efficient daily workflows.
JSON Formatter
Format, validate, and minify JSON
Base64 Tool
Encode and decode Base64
JWT Decoder
Decode and validate JWT tokens
URL Parser
Parse and analyze URL components
Regex Tester
Test regex patterns with highlighting
Timestamp
Convert Unix timestamps and dates
Minifier
Minify JS, CSS, and HTML
Generators
UUID, passwords, random strings
Loved by Developers
Join thousands of developers who trust Devsy for their daily workflow
"Devsy is a game-changer! The form filler alone saves me hours every week. Best dev tool I've used in years."
"The SEO suite is incredible. I can audit an entire site in minutes. The SERP simulator is spot-on accurate."
"Finally, a dev tool that respects privacy! Everything runs locally. No more sending data to third-party servers."
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Frequently Asked Questions
Absolutely. Devsy runs entirely locally in your browser. No data is sent to external servers, ensuring your development environment stays private and secure.
Not at all. Devsy is built to be lightweight. It only loads when you explicitly activate it, so it won't slow down your daily browsing.
Yes! Devsy works perfectly on localhost, staging environments, and production websites. It works anywhere Chrome works.
Yes, the essential features of Devsy are free to use. We believe in empowering developers with great tools.
Ready to build better web apps?
Join thousands of developers who are debugging faster and smarter with Devsy. Free to use, forever.
Install from Chrome Web Store