Callsign vs Splunk
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.
Data platform for security and observability acquired by Cisco for $28B in March 2024. Used by 90 of Fortune 100; 7,500+ enterprise customers globally; flagship SIEM and Splunk SOAR power enterprise security operations centers.
About
Splunk is a data platform for security and observability founded in 2003 in San Francisco, built on the idea that machine-generated data — logs, events, metrics, traces — contains the intelligence organizations need to detect threats, investigate incidents, and ensure digital systems stay available. The company's core technology indexes and searches massive volumes of machine data in real time, enabling security and IT operations teams to answer complex questions across their entire data estate without predefined schemas.\n\nSplunk's flagship product is its SIEM (Security Information and Event Management) platform, used by 90 of the Fortune 100 to detect and respond to security threats. Its broader portfolio includes Splunk Observability Cloud for infrastructure monitoring, Splunk SOAR for security orchestration and automated response, and Splunk IT Service Intelligence for IT operations. The platform's schema-on-read approach and SPL query language give analysts flexibility to investigate novel threats and operational issues that structured databases cannot accommodate.\n\nSplunk was acquired by Cisco for $28B in March 2024, one of the largest cybersecurity acquisitions in history, and has been integrated into Cisco's AI-driven security portfolio. The combination of Cisco's network telemetry and global customer relationships with Splunk's data analytics depth creates a powerful full-stack security and observability offering. Under Cisco, Splunk is adding AI-native features — including AI Assistant for SPL and automated threat detection — to maintain its leadership position as the SIEM market evolves toward AI-augmented security operations.
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