20The full stack, grouped
Hosting, frameworks, analytics, ads, CRM, support, email, payments and AI tools, each under its category with its logo.
New: the Chrome extension is here
See what any website runs on, right in Chrome
Click the runsonwhat icon on any site to see its tech stack: what the page loads, plus the DNS, email and certificate records behind the company. Every tool comes with where it was found.
- 1,400+ tools tracked
- DNS, email & certificates beyond page code
- Domain only leaves your browser
notion.so
What you get on every site
Where each tool was found
On the page, in DNS or email records, in certificate logs or on a subprocessor list, so you know why a tool is listed.
Adoption dates with proof
When a certificate shows when a company started using a tool, the popup says since when, like “since Oct 2019”.
Beyond page code
Sees the tools a page never loads
DNS verification records, email records and certificate logs reveal a company's CRM, help desk, identity provider and AI tools. runsonwhat shows them next to everything the page itself loads, with a note on where each one was found.
Export
Take any stack with you
Download a CSV of every tool, its category and where it was found, or copy the stack as text for your CRM, a research note or a message to your team.
Light and dark
Easy on the eyes, day or night
Light, dark or follow your system. Turn on auto-detect to see a tool count on every site you visit, or leave it off and check a site when you click the icon.
On runsonwhat.com
Every tool, with the proof
One click opens the company’s full profile: its industry and size, when it adopted each tool, and the public record behind every match. See how we detect tools.
How it works
- 1
Add it to Chrome
Install runsonwhat from the Chrome Web Store and pin the icon to your toolbar.
- 2
Click on any website
Open the popup to see the site's tech stack, grouped by category, with where each tool was found.
- 3
Go deeper on runsonwhat
Open the company's full profile for the evidence behind every tool, adoption dates and company details.
Private by design
Detection on the page runs in your browser. The extension sends only the site’s domain (like example.com) to runsonwhat to look up stored records. It never sends the full address, page content, cookies or your browsing history, and it has no analytics or tracking. Read the privacy policy.
Chrome extension FAQ
What does the runsonwhat extension show?
The runsonwhat extension shows the technologies behind the website in your current tab, grouped by category: hosting, analytics, frameworks, CRM, support, email, AI and more. Each tool comes with where it was found, whether in the page's code, in DNS or email records, or in certificate logs, and a link to the company's full profile on runsonwhat.
How is it different from extensions that only read page code?
Most technology extensions only read the code a page loads. runsonwhat adds what it has found in a company's public records: DNS verification records, email records, certificate logs and subprocessor lists. That is how it shows tools a homepage never loads, such as the email platform, help desk or identity provider, next to the page's own analytics and frameworks.
What data does the runsonwhat extension send?
Only the site's domain, such as example.com, which the extension sends to runsonwhat to look up stored records. Detection on the page runs inside your browser. The runsonwhat extension never sends the full address, page content, cookies or your browsing history, and it contains no analytics or tracking. The privacy policy has the details.
Does the runsonwhat extension read every site I visit?
No, not by default. The runsonwhat extension reads a site when you click its icon. If you turn on auto-detect in the popup, Chrome asks you to allow access to all sites, and the badge then shows a tool count on every site you visit. Turning auto-detect off removes that access again.
Can I export a website's tech stack?
Yes. The runsonwhat extension's Export menu downloads the current site's tools as a CSV file, with each tool's category, where it was found and its runsonwhat page, or copies the stack as text you can paste into a CRM, a note or a message.
Which browsers does the runsonwhat extension work in?
The runsonwhat extension is published on the Chrome Web Store, so it installs in Google Chrome and in other Chromium browsers that can install from that store, such as Microsoft Edge, Brave and Arc. Install it once and the icon appears in your toolbar.
See what the next website runs on
Add runsonwhat to Chrome and click the icon on any site.
Add to Chrome