How Ful.io makes and handles its data
Ful.io is a web-technology analytics platform. This page explains what our data is, how it is produced and the controls we offer, in plain language.
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If a fact is not about a website or the software it runs, it does not belong in our index.
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Claude
Chrome
HubSpot
Firefox
ChatGPT
Edge- Your WebApp
What Ful.io is
Ful.io answers two questions: what technology is a website built with, and which websites run a given technology. Operating since 2021, we index 100M+ websites and detect 75,000+ technologies across 277+ categories: CMS platforms, frameworks, analytics tools, ecommerce systems, payment gateways, hosting, CDNs and more.
Everything we sell is built from those detections: single-site lookups, market-share statistics, adoption breakdowns by country and industry, technology comparisons, and exportable reports of the websites running a technology. It is a census of the web’s software, facts about websites and the technology they run.
What is Ful.io →Crawl
Our engine visits publicly available websites and reads the same pages a site serves to any visitor or search engine. Nothing is accessed behind a login, paywall or access control.
Detect
Each page is matched against our library of 75,000+ technology fingerprints, the characteristic signatures technologies leave in a page's code, headers and configuration. A detection says one thing: this website runs this software.
Classify
Our own systems evaluate site-level attributes, the country a website serves and the industry it operates in, from the signals the website itself publishes. No third-party tracking is involved; it is analysis of what the site already says publicly.
Aggregate
Detections roll up into the statistics you see across Ful.io: how many websites run each technology, market share within a category, adoption by country and industry, and head-to-head technology comparisons.
What we don’t do
The limits matter as much as the capability. These are not aspirations, they are the rules the crawler and the product are built to.
Terms of service →Accuracy, corrections and removal
The index corrects itself
Websites change their stacks and the index changes with them. Sites are re-scanned continuously, and detections reflect what a site currently serves.
Tell us when we are wrong
Anyone can flag an incorrect detection to support@ful.io. We review and correct rather than argue.
Your website, your choice
Any domain owner can have their site removed from public lookups, reports and the directory. We verify ownership, and removed domains go on an exclusion list so they are not re-crawled or re-listed.
Where your account data lives
Infrastructure
All traffic to ful.io and api.ful.io is encrypted over TLS. The platform runs on AWS in the United States, and internal access is restricted to the people who operate the service.
Payments
Subscriptions are processed by PCI-DSS compliant payment partners on their own hosted checkout pages. Card details never touch Ful.io servers.
Account data
We store what is needed to run your account, sign-in details, billing plan and usage, and we don't sell it. The full detail is in the privacy policy.
Ful.io is operated by Ful, Inc., a Delaware corporation, 1207 Delaware Ave #348, Wilmington, DE 19806, USA. Questions about anything on this page? Email support@ful.io or use the contact page. Full detail in the privacy policy and terms of service.