A fair, sourced look at two enterprise AI security and governance platforms. WitnessAI centres on network-level visibility and its Observe, Protect, Control, and Attack modules. Prompt Security spans employees, homegrown apps, code assistants, and agents, and is being acquired by SentinelOne. This page is not sponsored by either vendor. Every claim below comes from their public materials.
Both platforms discover AI usage, prevent data leakage, and defend against prompt injection. The real choice is about where enforcement sits and how each company is evolving.
WitnessAI leans on network-level visibility that works without browser extensions or endpoint clients, with single-tenant deployment. Prompt Security commonly deploys a Chrome browser extension via MDM and offers SaaS or on-premises, and its GenAI protection is being folded into SentinelOne's Singularity platform following the 2025 acquisition announcement. Neither is strictly better; they fit different architectures and roadmaps.
Each cell reflects what the vendor publicly states as of 2026. AI security products change quickly, so verify current details directly with each vendor before deciding.
| Dimension | WitnessAI | Prompt Security |
|---|---|---|
| Primary framing | iUnified AI security and governance: Observe, Protect, Control, Attack | iGenAI security across employees, homegrown apps, code assistants, agents |
| Deployment | iNetwork-level visibility without browser extensions or endpoint clients; single-tenant, multi-region option | iSaaS or on-premises; Chrome browser extension deployed via MDM / Intune |
| Shadow AI discovery | ✓Catalogues AI apps, agents, and MCP servers across the org | ✓Visibility into employee GenAI usage and unsanctioned tools |
| Data protection / DLP | ✓Guardrails including redaction, tokenization, and content filtering | ✓Semantic data leakage prevention; redacts sensitive data before it leaves |
| Threat protection | ✓Runtime defense against prompt injection and harmful outputs; intent-based classification | ✓Detects prompt injection, jailbreaks, and data exfiltration across many LLMs |
| Agentic AI | ✓Agent and MCP server governance with approved tool lists | ✓MCP Gateway to monitor and govern agentic AI |
| AI red teaming | ✓Attack module for automated red teaming before production | ✓AI red teaming plus open-source Prompt Fuzzer |
| Corporate status | iIndependent company; reported a $27.5M funding raise | iSentinelOne announced acquisition (2025); folding into Singularity |
| Stated certifications | ✓SOC 2 Type I and Type II stated on its site | ~Confirm current certifications directly with the vendor |
Legend: ✓ capability the vendor publicly describes · ~ partial or worth confirming with the vendor · i neutral context, not a capability. Sources: witness.ai, prompt.security, and public press, gathered June 2026.
If you want enforcement at the network layer with single-tenant isolation and no agents to deploy, WitnessAI's architecture is a natural fit, and its Attack module adds built-in red teaming. If you are already a SentinelOne customer, or you want a browser-extension rollout that also covers homegrown LLM apps and AI code assistants, Prompt Security and its move into the Singularity platform may align better with your stack.
For most buyers the deciding factors are not the feature checklist, which overlaps heavily, but deployment model, existing vendor relationships, and roadmap direction. Run a short pilot of each on your own traffic before committing.
WitnessAI and Prompt Security are strong AI security platforms. If your priority is changing how employees use AI, not only inspecting traffic, Aona AI is worth a look as a focused third option.
Aona focuses on Workforce AI Security: discovering shadow AI and coaching employees at the moment of a risky prompt, at the browser and endpoint.
Real-time guidance and AI upskilling aim to change how the workforce uses AI over time, not only to block a domain or flag an alert after the fact.
SOC 2 Type II certified, 92.9% AI classification accuracy, and a 30-day free trial with no credit card. Nothing here you cannot verify.
Aona is Workforce AI Security, a different category from the two platforms above. We list it here as an honest alternative, not a like-for-like replacement.
Whichever platform you choose for the network and app layer, employee AI behaviour is where most data risk starts. Book a demo to see shadow AI discovery, real-time coaching, and DLP for AI tools on your own environment, or start a 30-day free trial, no credit card required.