We track over 3000+ technologies accompanied by downloadable reports.
We provide Professional domain data for analysts, sales teams, and marketers.
Fully featured, Highly Accurate Email Verification is 1/4th the cost.

What Is The Web Built On?

Uncover the technology stack behind any website.
Use our tools for lead generation, market analysis and competitor research.

Power Your Sales And Marketing Teams


Download lists of websites using a specific technology. We track over 3,000 technologies across 280+ million websites.


Technology Reports include email, phone numbers, and website profiling metadata like IP, Hostname, DNS, titles, and other information.

Rich Data

Industry-leading 9-step email verification engine. Never worry about email non-delivery again!


Download lists of active domains across 100s of gTLDs and ccTLDs updated daily.

Zone Files

Custom deploy our technology to search domains for contact information.

Deep Search

Data Enrichment

Data Enrichment

Our data is available for all your general purpose tools

Import your website list and our technology stack will do all the heavy lifting, pulling contact information that would take weeks or months to gather with traditional market research methods. Our tools and technologies crawl and scan websites completely autonomously.

Key Highlights:

Website lookup capabilities and technology comparable to the best in the industry.

Generate high quality leads with our technology reports.

Identify technographic segmentation.

Security Reconnaissance

Your security is our top priority.

Security professionals worldwide use our web technologies. This solution helps you track security threats on your website. The technology also provides you with detailed information on vulnerabilities and exploitation risks.

Key Highlights:

Track your own and your competitors' technology trends.

Effectively assess the depth of technology penetration.

Identify bugs and the impact of patches.

Security Reconnaissance
Email Verification

Email Verification

Never worry about non-delivery of your emails

Our email extension technology verifies deliverability and checks the server connection to ensure that your email delivery rate remains high, keeping you off the contact blocklist. Our technologies allow us to do all of this without having to send an email to the contact.

Key Highlights:

Get immediate results and a responsive, intuitive UX with our technology.

Start with 100 free email verifications every month.

Top up email verification credits on the go.


Get unlimited access to our APIs

With Ful.io APIs, you have access to any technology stack, contact details, relevant social handles, and much more. Much like BuiltWith, our technology lets you analyze many websites at once, track data on technology usage, and even build your own analytics dataset.

Key Highlights:

Get results right away and update your datasets in real-time.

Our technologies let you easily analyze multiple websites at once.

Take advantage of a free trial before signing up.



Todd Dunsmore
Doja Marketing/Defi Founder

"These web technologies quickly became a game-changer for our business. Lead generation projects that used to take a whole team are completely automatic now. We were able to segment traffic based on location, identify more prospects, and onboard more clients. I can't say enough good things about Ful.io."

Nicholas Altimore

"Companies need an edge, and Ful.io provided that edge for us. We'd previously used BuiltWith, but the data and analytics capabilities of Ful.io were a better fit for us."

Chris Richards
Utterly Digital

"We used to manually upload contact details and other data, but it took way too long. We needed a solution that could automate the process and free up resources. Ful.io just works for us. Their technology is incredible."

Robert Kaene
The Wednesday Club

"Ful.io's apps and tools have completely changed the way we look at traffic and identify prospects. Before, our R&D team tried BuiltWith, then worked to develop our own technology. But with Ful.io, we can save both time and money."

Mad Singers
SEO Mastery Summit

"We're always looking for new ways to boost our advertising efforts and analyze websites to improve our processes. Ful.io has been a perfect partner throughout. We've been able to discover more valuable data on prospects than we ever did on our own."

Yana L
SEO Consultant

"Any ecommerce platform not using Ful.io's technologies is seriously missing out. The crawling tool at Ful.io is the best we've used so far. We love that you can pull it up right in the Chrome browser too. Location, contact info, RSS, the speed we can draw in new clients now... Ful.io is amazing."

Frequently Asked Questions

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