Why does Wappalyzer list technologies a website doesn't seem to use?
The Wappalyzer help pages give 4 common reasons. The first to rule out: If you use Wappalyzer's lookup, a lookup that reaches further back returns more results, but some of them were last checked longer ago.
What causes it?
If you use Wappalyzer's lookup, a lookup that reaches further back returns more results, but some of them were last checked longer ago.
In the Wappalyzer help:
Use a higher value to get more but less recently verified results.
Technology lookup - Wappalyzer, read 2026-11-12.Wappalyzer's lookup can merge results from several months into one set, so a list can combine what was seen in different months.
In the Wappalyzer help:
Merge monthly results into a single set.
Technology lookup - Wappalyzer, read 2026-11-12.Wappalyzer's lookup can follow a website's internal links and check several pages, so it can list technologies used on inner pages as well as the home page.
In the Wappalyzer help:
Index multiple pages (follows internal website links for increased coverage).
Technology lookup - Wappalyzer, read 2026-11-12.Wappalyzer says its data collection can surface pages that traditional crawlers cannot always reach.
In the Wappalyzer help:
This helps us surface actively used websites and technologies, including pages traditional crawlers cannot always reach.
Frequently asked questions - Wappalyzer, read 2026-11-12.
How do I check it myself?
Visit the website with Wappalyzer's browser extension to see which technologies it detects on the pages you open now.
In the Wappalyzer help:
The extension automatically checks pages you visit and reveals the technologies the website is built with.
How to identify the technologies used on a website - Wappalyzer, read 2026-11-12.Run the website through Wappalyzer's online lookup and compare what it finds with your list.
In the Wappalyzer help:
Alternatively, you can use the online technology lookup, which requires no installation.
How to identify the technologies used on a website - Wappalyzer, read 2026-11-12.For a WordPress site, you can usually confirm the CMS yourself by looking at the page source.
In the Wappalyzer help:
WordPress sites can usually be identified by looking at the website's source code.
How to identify the technologies used on a website - Wappalyzer, read 2026-11-12.
How does Wappalyzer work with Feder?
- Connect Wappalyzer to Feder and it joins your Interest apps.
- When you connect Wappalyzer, Feder checks the connection straight away and shows Connected only when that check passes. If a reading cannot be taken later, Feder shows it as not read, never as zero.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.
See whether you can trust the numbers in Wappalyzer, one of your Interest apps. Feder only reads. It never changes anything in Wappalyzer.
What else goes wrong with these numbers?
- Why did Wappalyzer find fewer technologies for a website?Wappalyzer
- Why did Google Analytics stop collecting data?Google Analytics
- Why aren't my key events showing in Google Analytics?Google Analytics
- Why does Google Analytics show (not set)?Google Analytics
- Why is yesterday's data missing in Google Analytics?Google Analytics
See every question.
Where do these answers come from?
Every cause and check on this page comes from the Wappalyzer help pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.