Callsign vs Zscaler
Side-by-side comparison of AI visibility scores, market position, and capabilities
Callsign is a London-based intelligent authentication platform combining behavioral biometrics, device intelligence, and multi-factor authentication; raised $121M total including a $35M round led by Accel in 2024;
About
Callsign is a digital identity and authentication company founded in 2010 and headquartered in London, United Kingdom. The company builds an intelligent authentication platform that verifies user identity through multiple simultaneous signals — behavioral biometrics (how a user types, swipes, and moves a device), device intelligence (device fingerprinting, SIM state, GPS data), and contextual risk signals — in addition to traditional multi-factor authentication methods. By combining these layers into a single authentication decision, Callsign claims to achieve recognition accuracy of up to 99.999%, enabling frictionless authentication for legitimate users while flagging anomalous sessions for step-up verification or fraud review.
San Jose zero trust security (NASDAQ: ZS) surpassing $3B ARR FY2025; 500B+ daily transactions across 160+ data centers for 8,650+ enterprises and 35% Forbes Global 2000 competing with Palo Alto Prisma for enterprise zero trust.
About
Zscaler is a San Jose, California-based cloud security company — publicly traded on NASDAQ (NASDAQ: ZS) at approximately $30 billion market capitalization — operating the world's largest security cloud, the Zscaler Zero Trust Exchange, that processes 500+ billion daily transactions across 160+ data centers globally. In fiscal year 2025 (ended July 31, 2025), Zscaler surpassed $3 billion in annual recurring revenue (ARR) with Q4 FY2025 revenue of $719.2 million (21% year-over-year growth), serving 8,650+ enterprise customers including 35% of the Forbes Global 2000. The platform's flagship products — Zscaler Internet Access (ZIA, secure web gateway), Zscaler Private Access (ZPA, zero trust network access), and Zscaler Digital Experience (ZDX, application performance monitoring) — have eliminated traditional VPN and network perimeter architectures for thousands of enterprises. Founded in 2007 by CEO Jay Chaudhry (serial security entrepreneur who built and sold four prior security companies); IPO March 2018.
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