WhatRuns
Free browser extension that instantly identifies the technologies, frameworks, plugins, and fonts used on any website.
The problem it solves: Curious what framework or analytics tool a competitor's site uses? WhatRuns reveals any website's technology stack free from your browser.
Our verdict: WhatRuns instead of SimilarWeb?
Switch if: A free, quick browser-extension lookup of the technology stack behind a single website — CMS, plugins, fonts, analytics and ad networks.
Don’t switch if: Any traffic, audience, keyword or ads-spend research, or bulk/API work; it only reveals detected technologies one page at a time and misses some widely-used tools.
Biggest caveat: It shares essentially none of SimilarWeb's analytics scope — no traffic, channels, keywords, app or audience data — and coverage is thinner than paid technographic tools.
Pricing Facts
Does it replace SimilarWeb?
WhatRuns measured against the six things people actually use SimilarWeb for.
Features & Capabilities
Available Features
Pros & Cons
Pros
Cons
Best Use Cases
Target Audience
What Real Users Complain About
Negative feedback found on public platforms — because every tool has trade-offs, and vendors won't show you these.
“very basic in terms of showing the tech stack.”
“This tool provides an efficient overview of the current website but cannot search independently.”
Ready to Try WhatRuns?
Get started with WhatRuns for free and explore its features.