Browser fingerprinting
FingerprintJS
44K sitesSaaSOpen sourcePay as you go
FingerprintJS is a browser fingerprinting library that queries browser attributes and computes a hashed visitor identifier from them.
ClientJS
3.9K sitesOpen source
ClientJS is a JavaScript library for generating browser fingerprints, exposing all the browser data-points.
MaxMind
1.9K sitesSaaSFreemium · Pay as you go
MaxMind is a provider of geolocation and online fraud detection tools.
TruValidate
1.7K sitesSaaSQuote
TransUnion TruValidate (previously ReputationShield/IDVision from iovation) is an online risk and fraud detection platform.
ThreatMetrix
474 sitesSaaSQuote
LexisNexis ThreatMetrix is an enterprise solution for online risk and fraud protection ('digital identity intelligence and digital authentication').
Data from the open Wappalyzer database (enthec/webappanalyzer, GPL-3.0), updated every week. Site counts from the HTTP Archive (September 2026). Code tools (frameworks, build, ORMs…) come from a list kept by Faundr.