Visitor Identification Software Market Share & Usage Statistics (2026)
FingerprintJS runs on 74,533 live websites, 25.8% of the 288,819 sites we detect using visitor identification software. Below, all 50 tools we detect in this category, ranked by live websites, with market share and 30-day adoption momentum.
Data updated Aug 19, 2026
- #1
FingerprintJS
FingerprintJS is an open-source browser fingerprinting library with 26,900+ GitHub stars and over 5 million monthly npm downloads.
Live websites74,533Market Share25.81%Top CountryUnited States - #2
ipapi.co
ipapi.co is a free IP geolocation API.
Live websites41,649Market Share14.42%Top CountryUnited States - #3
Leadfeeder
Leadfeeder is a B2B website visitor identification tool that reverse-resolves a visitor's IP address to a company and feeds the result to a sales team.
Live websites36,312Market Share12.57%Top CountryUnited States 
ip-api
ip-api is a free IP geolocation API whose public endpoint needs no account, capped at 45 requests a minute per IP and HTTP-only on the free tier.
Live websites29,663Market Share10.27%Top CountryUnited States
ZoomInfo
ZoomInfo is a B2B data and go-to-market platform whose WebSights tag identifies the companies visiting a website.
Live websites29,253Market Share10.13%Top CountryUnited States
Visitor Identification Market Data
Adoption and 30-day momentum across 50 visitor identification technologies, measured from our live detection crawl.
Biggest Movers
Expert Insight: Visitor Identification Software Market Share & Momentum
Three unrelated businesses share this table, and the biggest mover in it is a detection change.
FingerprintJS leads with about 26% of the 289,000 domains here, but the category mixes device fingerprinting, IP geolocation lookups and B2B company resolution, and those are sold to different buyers for different jobs. Roughly 26% of the table is a call to a free IP lookup API, which most sites use to pick a currency or a language. Zoominfo added about 20,000 domains over the quarter on a base of 29,000, and that is a second detection clause rather than 20,000 new customers.
Twenty-seven percent fingerprinting, twenty-six percent IP lookup, thirty-four percent lead resolution
FingerprintJS at about 26% and ClientJS at 1.2% are device fingerprinting libraries. ipapi.co at 14%, ip-api at 10% and MaxMind at 1.6% are IP geolocation APIs matched on an outbound request, and a shop using one to set a currency is not identifying anybody. Leadfeeder 13%, Zoominfo 10%, Leadinfo 8%, Lead Forensics and Leadsy reverse-resolve a visitor's IP to a company for sales teams. Compare inside a group, never across them.
Zoominfo's twenty thousand is a clause, not a quarter
Zoominfo added about 19,987 domains over 30 days on a base of 29,253, roughly two thirds of its current footprint. Its detection matches two different vendor hosts, and a step of that shape inside one window is what a second signature looks like when it starts matching. Four more entries, Leadsy and Nakanohito Beta among them, each added their whole base in the window. Set those aside and the real movement is ip-api at about 1,647 over the quarter and ipapi.co at 1,257, with FingerprintJS flat at 140 down.
Turnover of 7.3% puts this in the top ten most volatile categories we measure
FingerprintJS shed roughly 5,616 domains over 30 days, about 7.5% of its base. ipapi.co and ip-api run higher at around 11%. Every leading signal here is a script or a request the browser has to make, so the detection disappears the moment the code does, which is the opposite of the DNS-record categories where nothing ever churns. A free IP lookup is also a line someone deletes when a rate limit or a bill turns up. And they delete it rather than replace it: we tested every candidate corridor out of ipapi.co, ip-api and Leadfeeder against the rate among domains that stayed, and all of them came out at or below it.
The leader's growth is our crawl reaching further into hosts we already had
FingerprintJS rises sharply across the current crawl window, but about 39% of the domains we first saw in the last 30 days are subdomains against 5% of the ones we already knew, so most of that is depth rather than adoption. Its detection also matches two third-party hosts, one of them a Vietnamese e-commerce CDN, which accounts for about 2.7% of the base. The share column is sound inside each of the three groups. The trend column is not, in either direction.
Market Share
- FingerprintJS25.81%
- Iipapi.co14.42%
- Leadfeeder12.57%
- ip-api10.27%
- Zoominfo10.13%
Leadinfo8.01%- …Others18.8%
Visitor Identification
FAQ.
What is Visitor Identification software?
Visitor Identification covers the tools a site can load or configure to handle this part of its stack. We detect one of the 50 visitor identification tools in this category on 288,819 live sites. A detection means we found the technology on the site, which is not the same as a paid account.
What are the most popular visitor identification platforms?
Across 288,819 detected sites, the most widely found visitor identification tools are: FingerprintJS (25.81% share, 74,533 sites), ipapi.co (14.42% share, 41,649 sites), Leadfeeder (12.57% share, 36,312 sites). Others we see regularly include ip-api and Zoominfo.
Which visitor identification tool has the largest market share?
FingerprintJS is the most widely detected visitor identification tool at 25.81% share, on 74,533 sites. The largest share of those sites belongs to Real Estate companies, and to businesses in the 1-10 employee band.
Which industries use visitor identification software the most?
The industries with the most detected sites in this category are Software Development, IT Services and IT Consulting, Advertising Services, Technology, Information and Internet, Retail. Industry mix follows where these tools get installed, so a category carried by website builders or agency templates will lean toward the verticals those platforms serve rather than the vendor's target buyer.
Which countries have the highest adoption of visitor identification tools?
We detect the most visitor identification sites in United States, United Kingdom, India, Canada, Germany. Country here is the company's registered location in our enriched data rather than where the site is served from, so read it as a ranking of markets rather than a measure of any single one.
How do I choose the right visitor identification platform?
Start from your own size, industry and primary use case rather than from share. FingerprintJS, ipapi.co and Leadfeeder are the three we detect most often in this category, which tells you what is common, not what fits you. Compare their integrations, pricing tiers and support commitments against the workflow you actually run, and check each vendor's own documentation for current capabilities.
How many companies use visitor identification software?
TechnologyChecker.io detects visitor identification tools on 288,819 live sites. That is a count of sites carrying the technology, not a count of paying customers, and a site running two tools in this category is counted under each. We crawl 2 billion+ URLs across 29.9M live business domains each sweep.
What is the source of this data?
TechnologyChecker.io's web crawling and technology detection platform. We've logged 2.12 billion total detections over 20+ years, covering 40,000+ technologies across the 29.9M live business domains we successfully crawl each sweep. Detection methods include JavaScript analysis, HTTP headers, HTML patterns, DNS records, and certificate transparency logs.