Witness AI Product vs Zscaler SPLX: Side-by-Side Comparison (2026)

Short answer

Mid-market and enterprise security teams deploying Windows Copilot and Office 365 need Witness AI Product because it maps AI usage at the network level before it becomes a governance nightmare. Coverage across ID.AM, PR.DS, and DE.CM means you're getting asset discovery, data protection, and continuous monitoring specifically for AI,not bolted-on afterthoughts in a general platform. Skip this if your AI risk appetite is still theoretical or your workforce hasn't standardized on Microsoft AI tools yet. Enterprise security teams deploying large language models in production will find value in Zscaler SPLX because it combines runtime input guardrails with automated red teaming, catching both prompt injection attacks and drift in model behavior that traditional security tools miss. The platform maps to six NIST CSF 2.0 functions across asset discovery, continuous monitoring, and supply chain risk, with particular strength in the Adverse Event Analysis phase through real-time LLM log inspection. This tool is overkill for teams still piloting single LLM applications or those primarily concerned with third-party model risk; it's built for organizations managing agentic workflows and internal model customization at scale.