Tech Stack & SEO Inspector
A Wappalyzer alternative that runs only when you click
Wappalyzer is the best-known way to see what a website is built with, and it's good at it. Tech Stack & SEO Inspector does the same job differently: it looks at a page only when you click its icon, sends nothing about that page anywhere, and adds an on-page SEO score.
The difference in one paragraph
To show a count on its icon as you browse, the Wappalyzer extension runs on every website you visit, so it asks for access to all of them. In its Chrome version the setting Anonymously send identified technologies to wappalyzer.com is on by default, and its privacy policy says the extension "periodically sends limited website-level data about websites you visit to our servers": the hostname, whether the site used HTTP or HTTPS, and the technologies found, not full page content or full URLs. You can turn that off in its settings. The Inspector has no access to any site until you click, and it has nothing to send: the work happens in its popup on your computer.
How it compares
Wappalyzer's details are from version 6.12.7 of its Chrome extension (updated 28 September 2026), its manifest and settings, and its privacy policy, checked 9 October 2026.
| Tech Stack & SEO Inspector | Wappalyzer | |
|---|---|---|
| When it looks at a page | Only when you click its icon, on that tab | On every http and https page you visit |
| Access asked for at install | The page you're on, when you click (activeTab), plus scripting and storage | All http and https sites, plus cookies, tabs, webRequest and storage |
| What it sends | Nothing about the pages you inspect | Hostname, HTTP or HTTPS, and technologies found, unless you turn the setting off |
| Account | Not needed | Not needed for detection |
| Technologies it knows | About 3,500, from Wappalyzer's last open-source release (January 2023) plus our own additions | About 7,300 fingerprints in the extension, kept current |
| Evidence | Each detection opens to show what matched: script URL, meta tag, header, cookie name, element or JavaScript variable | Not compared |
| SEO | An on-page score from 0 to 100: title, description, headings, indexing, canonical, images, social tags, structured data and more | Not part of the extension |
| History | Per-site history and what changed since your last visit, kept on your computer (Pro) | Keeps cached detections |
| Company and contact details | No | With its paid Plus plan |
| Browsers | Chrome | Chrome, Firefox, Edge and Safari |
"Pro" marks a feature of the Inspector's paid plan; the tech stack and SEO score are unlimited without it.
When Wappalyzer fits better
- You want to see the stack of every site as you browse, without clicking. That's exactly what its all-sites access is for, and the Inspector deliberately can't do it.
- You need the newest products detected. Its fingerprint set is about twice the size of ours and kept up to date; ours started from its January 2023 open-source release.
- You're prospecting. Company and contact details, lead lists and CRM integrations are what its paid plans are for.
- You're not on Chrome. It also runs in Firefox, Edge and Safari.
The Inspector fits better when you want the stack and the SEO basics of one page in one popup, from an extension that sees nothing until you ask.
Try it
Add it to Chrome, open any website and click the icon. The docs list every SEO check and how the score is worked out, and the privacy policy says what it reads and keeps. For a list of sites rather than one page, the same detection runs as the Tech Stack Detector on Apify.