Free tools / Sentry
What is this website built with?
Paste any website. You get the CMS, page builder, hosting, analytics, payment and marketing tools it uses, with versions where we can see them.
- Loading the page
- Reading scripts, headers and cookies
- Matching more than 6,000 fingerprints
What the checker can find
Every website leaves traces of how it was built. A WordPress site loads files from a folder called wp-content. A Shopify store loads scripts from cdn.shopify.com. Google Analytics, Meta's pixel, a live chat bubble and a cookie banner all load from their own addresses. The checker reads those traces and matches them against more than 6,000 technologies.
Results are grouped by job: content management, page builders, analytics, advertising, payments, hosting and security, live chat, fonts and JavaScript libraries.
Why it is useful
- Researching a competitor: see which booking system, review app or email tool they use.
- Buying a business or taking over a website: know what you are inheriting before you sign.
- Checking your own site: spot tools nobody uses any more but which still slow every page down.
- Planning a rebuild: know exactly which features you will need to keep.
Where the data comes from
The fingerprints come from webappanalyzer, an open-source project that keeps the Wappalyzer fingerprint list going after Wappalyzer went private in 2023. We update our copy regularly.
Questions
How does the technology checker work?
It loads the page once, like a browser, and compares the code, scripts, headers and cookies against more than 6,000 known fingerprints. The fingerprints come from the open-source webappanalyzer project, the community-kept successor to Wappalyzer.
Why is something missing?
Some tools only load after a click, on other pages, or behind a login, and some sites hide their headers. We only see what the public homepage shows on the first load.
Is it free?
Yes, with no sign-up. Results are cached for a few hours, so checking the same site twice is instant.
Can I see the version numbers?
Where the site exposes them. Version numbers matter: an old WordPress, jQuery or plugin version is one of the most common ways small business sites get hacked.
Want Sentry on this every day?
On Lupaan your whole team works in the background and tells you when something needs you.