Fingerprint

Fingerprint (formerly FingerprintJS) builds device identification technology that generates a stable, persistent identifier for a browser or device by combining roughly a hundred signals drawn from the browser, device hardware, and network context. The core problem it solves is re-identifying a returning visitor or device with high confidence even when that visitor clears cookies, uses a VPN, or otherwise tries to evade simpler tracking methods — a capability enterprises use for fraud detection, account-takeover prevention, and bot/abuse mitigation rather than for consumer tracking or advertising.

The company started in 2012 as an open-source browser fingerprinting library before commercializing as a SaaS product in 2019. Headquartered in Chicago and fully remote, Fingerprint has raised roughly $77 million in total funding, including a $33 million Series C round backed by Craft Ventures. Disclosed customers using the platform for fraud defense and personalization include Dropbox and Neiman Marcus.

Fingerprint competes in the identity-signal layer of fraud prevention alongside device-intelligence vendors like Seon and bot-management players like PerimeterX/HUMAN, differentiating primarily on identifier accuracy and low false-positive rates in its open-source-derived core library, which gives outside developers some ability to inspect and validate its detection logic rather than treating it as a pure black box.