WitnessAI vs Prompt Security: Which One Covers More of the OWASP LLM Top 10 in 2026?
WitnessAI and Prompt Security are both Guardrails / LLM Firewall vendors. WitnessAI covers 3 of 10 OWASP LLM risks and Prompt Security covers 3, as of 2026-07-13. Based on llmthreat's coverage scoring, WitnessAI and Prompt Security cover the same number of OWASP LLM Top 10 risks (3 each); the difference is in which ones. The full row-by-row diff is below.
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Spec comparison
| Attribute | WitnessAI | Prompt Security |
|---|---|---|
| Category | Guardrails / LLM Firewall | Guardrails / LLM Firewall |
| Deployment | Single-tenant environment with data sovereignty (proxy/gateway model) | SaaS + on-prem/self-hosted; inline proxy, browser extension, SDK |
| Best for | Enterprises needing an inline AI firewall to discover shadow AI/MCP servers, enforce policy, redact sensitive data, and block prompt injection/jailbreaks across employee and agent usage | Governing employee GenAI/shadow-AI usage and wrapping homegrown LLM apps with real-time DLP and injection defense |
| Founded | 2023 | 2023 |
| Funding | Over $85M | ~$23M total ($5M seed + $18M Series A) |
| Status | Active | Acquired · SentinelOne |
OWASP LLM Top 10 coverage: WitnessAI vs Prompt Security
This diff is llmthreat's editorial read of both vendors' public documentation as of 2026-07-13, not an audited or vendor-endorsed score.
| OWASP LLM Risk | WitnessAI | Prompt Security |
|---|---|---|
| LLM01 Prompt Injection | Covered | Covered |
| LLM02 Sensitive Information Disclosure | Covered | Covered |
| LLM03 Supply Chain | Partial | Not covered |
| LLM04 Data and Model Poisoning | Not covered | Not covered |
| LLM05 Improper Output Handling | Partial | Partial |
| LLM06 Excessive Agency | Covered | Partial |
| LLM07 System Prompt Leakage | Not covered | Partial |
| LLM08 Vector and Embedding Weaknesses | Not covered | Partial |
| LLM09 Misinformation | Partial | Not covered |
| LLM10 Unbounded Consumption | Not covered | Covered |
Where they differ
WitnessAI addresses LLM03 Supply Chain, LLM09 Misinformation — risks where Prompt Security scores Not covered or Unverified.
Prompt Security covers LLM07 System Prompt Leakage, LLM08 Vector and Embedding Weaknesses, LLM10 Unbounded Consumption where WitnessAI doesn't.
On the rest, they overlap. Past those gaps the decision is depth per risk, deployment, and price, not breadth.
Which should you choose?
On raw counts it's a tie at 3 covered risks each — the difference is which risks. WitnessAI is built for enterprises needing an inline AI firewall to discover shadow AI/MCP servers, enforce policy, redact sensitive data, and block prompt injection/jailbreaks across employee and agent usage, while Prompt Security suits governing employee GenAI/shadow-AI usage and wrapping homegrown LLM apps with real-time DLP and injection defense. Both rows sit in the full coverage matrix — read the profiles before deciding: WitnessAI and Prompt Security.
Frequently asked questions
Does WitnessAI or Prompt Security cover more of the OWASP LLM Top 10?
Neither — both cover 3 of the ten risks by our scoring, though not the same ones. The diff table above shows where they split.
Are WitnessAI and Prompt Security independent?
WitnessAI is independent; Prompt Security was acquired by SentinelOne, as of 2026-07-13.