← Back to extensions
On-page developer tools: colors, SEO, ruler, cookies, JSON. Free stays local. Pro syncs reports and palette via ExtHub.
On-page developer tools: colors, SEO, ruler, cookies, JSON. Free stays local. Pro syncs reports and palette via ExtHub.
User reviews
No reviews collected yet.
More in this category
Tampermonkey
🧑💻 Developer ToolsChange the web at will with userscripts
4.711,000,000
Free
ChromeEdgeFirefoxSafari
View details →React Developer Tools
🧑💻 Developer ToolsAdds React debugging tools to the Chrome Developer Tools. Created from revision 3cde211b0c on 10/20/2025.
4.05,000,000
FreeOpen source
ChromeEdgeFirefox
View details →Wappalyzer - Technology profiler
🧑💻 Developer ToolsIdentify web technologies
4.63,000,000
Free
ChromeEdgeFirefox
View details →