Can you trust the numbers in Wappalyzer?
Wappalyzer is a tool that helps sales and go to market teams find companies by the technologies their websites use and build prospect lists from data on millions of websites. Its own help pages give 4 reasons its numbers can look different from what you expect. The first to rule out: A technology listed for a website can be weeks out of date, since Wappalyzer's FAQ says it aims to recheck each site about once a month.
What does Wappalyzer keep track of?
Wappalyzer keeps lists of companies sorted by the technology they use, their industry, traffic and location.
In Wappalyzer's own words:
Build targeted prospect lists by technology, keyword, industry, traffic, and location.
Lead lists - Wappalyzer, read 2026-11-12.The traffic figures Wappalyzer keeps on websites come from people who use its browser extensions.
In Wappalyzer's own words:
Website traffic is tracked using our browser extensions with over 2.5M users.
Frequently asked questions - Wappalyzer, read 2026-11-12.
What can make Wappalyzer's numbers look wrong?
A technology listed for a website can be weeks out of date, since Wappalyzer's FAQ says it aims to recheck each site about once a month.
In Wappalyzer's own words:
Our dataset is continuously updated and we aim to re-verify identified technologies on every website at least once a month.
Frequently asked questions - Wappalyzer, read 2026-11-12.Company facts in a Wappalyzer list can be up to a few months old, as its FAQ says they are refreshed each quarter.
In Wappalyzer's own words:
Company details are refreshed quarterly.
Frequently asked questions - Wappalyzer, read 2026-11-12.Contact details in a list may be wrong or out of date, because Wappalyzer's FAQ says it passes on what public pages show without promising they are right.
In Wappalyzer's own words:
Email addresses and phone numbers obtained from public website pages are provided on an as-is basis.
Frequently asked questions - Wappalyzer, read 2026-11-12.A lookup can name technologies a site does not really use when its noise filter is turned off, as Wappalyzer's developer docs explain.
In Wappalyzer's own words:
Setting this to `false` yields more results but is more likely to include false positives.
Technology lookup - Wappalyzer, read 2026-11-12.
How do I check Wappalyzer's numbers myself?
When a stored result looks old, running a live check of the website gives a fresher answer.
In Wappalyzer's own words:
Query our database for fast results, or analyze websites live when freshness matters more than speed.
Technology lookup - Wappalyzer, read 2026-11-12.Reviewing the free sample first lets an owner spot wrong or missing companies before relying on a full list.
In Wappalyzer's own words:
Within minutes, you get a free sample to review before deciding to download the full list.
Lead lists - Wappalyzer, read 2026-11-12.Some detected technologies can be checked by hand by looking at a website's HTTP headers, as Wappalyzer's own guide describes.
In Wappalyzer's own words:
Web servers and CDNs can often be identified by inspecting HTTP headers.
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. Feder only reads. It never changes anything in Wappalyzer.
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.
Other apps that feed Interest
- Jotformform submissions
- Klaviyonew profiles
- Mailchimpclicks on today's sends
- ActiveCampaignnew contacts
- Cal.combookings made
- Intercomnew contacts
Questions owners ask about Wappalyzer
- Why did Wappalyzer find fewer technologies for a website?When a lookup has to crawl a site, its first response holds no technologies, and the full results arrive later.
- Why does Wappalyzer list technologies a website doesn't seem to use?If you use Wappalyzer's lookup, a lookup that reaches further back returns more results, but some of them were last checked longer ago.
Where do these answers come from?
Everything this page says about Wappalyzer comes from Wappalyzer's own 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.
Know the day a number breaks, not the month after.
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.