Comparison · 2026
WitnessAIPrompt Security · SentinelOne
WitnessAI vs Prompt Security (2026)
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À propos de ce comparatif
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 sold through SentinelOne. This page compares the two on public, verifiable facts, then adds Aona in a third column and gives a verdict on the employee AI use criteria: hard block with no user override, layout-preserving file redaction, real-time coaching, a 30-day self-serve trial, and seven hosting regions.
WitnessAI and Prompt Security both discover AI use, prevent data leakage and defend against prompt injection, one from the network and one from a browser extension plus the SentinelOne platform. Aona wins the employee AI use question with controls neither documents: a hard block with no user override, layout-preserving file redaction, and a 30-day self-serve trial.
WitnessAI leans on network-level visibility that works without browser extensions or endpoint clients, with single-tenant deployment and an Instant Demo product tour in place of a trial. Prompt Security deploys a Chrome browser extension via MDM plus an AI endpoint agent for local LLMs and MCP servers, offers SaaS or on-premises, and has been sold as Prompt Security from SentinelOne since the acquisition completed in September 2025. Aona inspects the prompt and the upload at submit on the managed device, in Chrome, Edge, Firefox and Safari and in the ChatGPT, Copilot and Claude desktop apps.
WitnessAI vs Prompt Security vs Aona, side by side
Competitor cells reflect what each vendor publicly states, re-verified on 17 September 2026. AI security products change quickly, so verify current details directly with each vendor, and test Aona on your own devices through its trial.
| Dimension | Aona | WitnessAI | Prompt Security |
|---|---|---|---|
| Primary framing | iWorkforce AI Security: employee use of AI tools on managed devices | iUnified AI security and governance: Observe, Protect, Control, Attack | iGenAI security across employees, homegrown apps, code assistants, agents; built into SentinelOne Singularity |
| Deployment | iBrowser plugin for Chrome, Edge, Firefox and Safari plus native endpoint app for Windows and macOS, pushed with existing deployment tooling; no network changes; first signal within hours | 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; AI endpoint agent for local LLMs and MCP servers (February 2026) |
| Shadow AI discovery | ✓Per-user discovery across a catalogue of 10,000+ AI tools, in the browser and in native desktop AI apps | ✓Catalogues AI apps, agents, and MCP servers across the org | ✓Visibility into employee GenAI usage and unsanctioned tools; claims 15,000+ AI tools |
| Data protection / DLP | ✓Prompt inspection at submit, before the prompt leaves the device; block or redact on prompts and file uploads | ✓Guardrails including redaction, tokenisation, and content filtering | ✓Semantic data leakage prevention; redacts sensitive data before it leaves |
| Hard block with no user override | ✓Hard block on prompts and file uploads with no user override | ~Policy can block in the inspected network path; user-override behaviour not publicly documented | ~Block and automatic anonymisation are policy options; an override-free block is not publicly documented |
| Layout-preserving file redaction | ✓Layout-preserving DOCX, XLSX and PDF redaction with length-matched entity replacement | ~Redaction and tokenisation of prompt content; document redaction not publicly documented | ~Sanitises prompt content; layout-preserving DOCX, XLSX and PDF redaction not publicly documented |
| Real-time employee coaching | ✓Coaching at the moment of a risky prompt, then per-team violation trends over time | ~Not publicly documented as an in-prompt learning loop | ✓Coaching claimed on its employees page |
| Native desktop AI apps | ✓Native endpoint app intercepts the ChatGPT, Copilot and Claude desktop apps | ~Claims monitoring of Windows 11 Copilot, Office 365 and other desktop AI applications when their traffic is routed through the inspected path | ~AI endpoint agent for local LLMs and MCP servers; interception of the ChatGPT, Copilot or Claude desktop apps not publicly documented |
| Threat protection | iOut of scope: Aona secures employee use of AI tools, not the AI you build (no LLM firewall) | ✓Runtime defense against prompt injection and harmful outputs; intent-based classification | ✓Detects prompt injection, jailbreaks, and data exfiltration across many LLMs |
| Agentic AI | ~AI agent and MCP inspection on the endpoint app, in limited rollout (not general availability) | ✓Agent and MCP server governance with approved tool lists | ✓MCP Gateway to monitor and govern agentic AI |
| AI red teaming | iOut of scope: not a red-teaming product | ✓Attack module for automated red teaming before production | ✓AI red teaming plus open-source Prompt Fuzzer |
| Self-serve trial | ✓30-day self-serve free trial; deploys with IT's existing tooling and shows a first signal within hours | ~Instant Demo product tour, not a self-serve trial (as of September 2026) | ~Demo only; no self-serve trial (as of September 2026) |
| Data residency choice | ✓Seven Aona-managed hosting regions: Australia, France, the UK, Germany, the US, Singapore and Hong Kong | ✓Single-tenant deployment with multi-region options | ~SaaS or self-hosted; managed hosting regions not publicly documented |
| Ownership | iIndependent and purpose-built for Workforce AI Security | iIndependent company | iPart of SentinelOne since the acquisition completed in September 2025; sold through Singularity |
| Stated certifications | ✓SOC 2 Type II; SIEM export to Microsoft Sentinel via OCSF, REST API and webhooks | ✓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, conditional or not publicly documented · i context, not a capability. Sources: witness.ai, prompt.security, each vendor's AWS Marketplace listing and public press, re-verified 17 September 2026.
The verdict for employee AI use
Aona wins the employee AI use criteria on this page: a hard block on prompts and file uploads with no user override, layout-preserving DOCX, XLSX and PDF redaction, real-time coaching at the prompt, coverage of the ChatGPT, Copilot and Claude desktop apps, seven Aona-managed hosting regions and a 30-day self-serve trial.
WitnessAI is for network-level AI security with single-tenant isolation, agent governance and built-in red teaming, and its inspection reaches only the traffic routed through its path, with an Instant Demo product tour in place of a trial. Prompt Security is for application-side AI security across homegrown apps, code assistants and agents, sold through SentinelOne's Singularity platform since September 2025, and its employee controls are demo-led with no self-serve trial (as of September 2026).
Why buyers pick Aona for employee AI use
Four differentiators the other two do not document, each stated against the mechanism WitnessAI and Prompt Security publish.
Hard block with no user override
WitnessAI documents policy enforcement in the inspected network path without describing the override model. Prompt Security documents block and automatic anonymisation. Aona's block on prompts and file uploads cannot be dismissed by the employee.
Files stay usable after redaction
Aona redacts DOCX, XLSX and PDF uploads with the layout intact and length-matched entity replacement. WitnessAI documents redaction and tokenisation of prompt content; Prompt Security sanitises prompt content. Neither documents layout-preserving file redaction.
On the device, no routed path required
Aona inspects the prompt at submit on the managed device, in Chrome, Edge, Firefox and Safari and in the ChatGPT, Copilot and Claude desktop apps, on or off the corporate network. WitnessAI sees the AI traffic routed through it; Prompt Security's employee coverage runs through a Chrome extension plus a February 2026 endpoint agent for local LLMs and MCP servers.
Trial before procurement
30-day self-serve trial, deployed with IT's existing tooling, with a first signal within hours and seven hosting regions. WitnessAI offers an Instant Demo product tour rather than a trial; Prompt Security is demo-only with no self-serve trial (as of September 2026).
Scope: Aona secures employees' use of AI tools. It is not an LLM firewall, an AI-SPM tool or a red-teaming product, which is where WitnessAI's Attack module and Prompt Security's application-side controls sit. Aona needs its plugin or endpoint app on managed devices, so personal and unmanaged devices are out of scope; there is no iOS or Android coverage; and AI agent and MCP inspection ships in limited rollout on the endpoint app.
SOC 2 Type II · 30-day self-serve trial · 7 Aona-managed hosting regions
FAQ
WitnessAI vs Prompt Security, common questions
What is the main difference between WitnessAI and Prompt Security?
How is each platform deployed?
Does either platform handle shadow AI and DLP?
Which one is better for securing AI agents?
Do I need Aona if I already have WitnessAI or Prompt Security?
Which of the three wins for employee AI use?
Are these facts up to date?
See the employee layer
on your own prompts
Employee AI use is where most data risk starts. Start a 30-day self-serve trial and watch Aona inspect a prompt at submit, block it with no override and redact a DOCX with the layout intact. Or book a demo and bring the same test you would put to WitnessAI and Prompt Security.