Prompt Security

What the company sells

Prompt Security offers protection for both employee use of AI tools and the apps an organization builds. Prompt Security continuously tracks prompts per day in organizations of 500 to 1,000 employees.

Prompt Security holds that securing agentic AI is fundamentally different from securing traditional software. Prompt Security states that agents act autonomously, call tools and reason over untrusted input, so prompt injection, identity and runtime behavior have to be governed in real time and not only at the perimeter.

Prompt Security provides a security skill suite for OpenClaw, NanoClaw and Hermes agents.

Prompt Security provides a tool that tracks and analyzes OpenClaw deployments across an organization. Prompt Security provides a tool that tests and hardens a system prompt against dynamic LLM-based attacks.

Prompt Security publishes news, research, tools and analysis for security teams responding to AI threats. Prompt Security describes an AI gateway as a centralized layer between an organization's users or applications and the AI models or services they call. An AI gateway, as Prompt Security describes it, lets security teams monitor, control and secure that traffic from one place instead of instrumenting every application separately.

Prompt Security curates an interactive, continuously updated directory of 471 companies building security for agentic AI, organized across 14 functional categories. Both pure-play startups and dedicated AI-security lines from larger vendors are in scope for the Prompt Security directory. Entries in the Prompt Security directory are compiled from vendor websites, product documentation, funding announcements, public company registries and analyst coverage. Placement in the Prompt Security directory reflects publicly stated capabilities, not vendor marketing tiers. Category definitions and threat coverage in the Prompt Security directory are mapped against established, independent frameworks for AI and LLM security. The full dataset behind the Prompt Security directory is open and machine-readable.^{[2][4][5][6][9]}

Categories

• AI firewalls and guardrails (primary category)
• Workforce AI usage security
• AI model and agent security
• Compare Prompt Security with companies in the same categoryside by side

Headquarters

Not established from our sources

Founded

2023^[1]

Ownership

Owned by SentinelOne since 2025^{[3][7][8][10]}

CISO on record

Not yet on our record. Send a verified source

Website

prompt.security

Products and services

Product names as the company writes them; what each does, in our words, from the company's own product pages. Never how well it does it.

• Prompt Fuzzer^[4]

  An open source tool for AI vulnerability assessment.

  Prompt Fuzzer is listed under AI Security Tools on the Prompt Security site. The site describes it as an open source tool for AI vulnerability assessment.

Competitors and alternatives

The other companies on our record filed under the same categories, category by category: first those that lead with that category and share more of Prompt Security's categories, then alphabetical. A list from the record, never a ranking.

• On ai firewalls and guardrails, Prompt Security competes with Lakera, Lasso Security, Impart Security, Operant AI, Pillar Security, AIShield, Alice, Aurascape, Enkrypt AI, Fiddler AI and 9 more.

• On workforce ai usage security, Prompt Security competes with Aurascape, Harmonic Security, Pluto Security, WitnessAI, Lakera, Lasso Security, Pillar Security, Abnormal AI, Asymptote Labs, Bay and 17 more.

• On ai model and agent security, Prompt Security competes with Pillar Security, AIShield, Alice, Asymptote Labs, Bay, Enkrypt AI, Fiddler AI, HiddenLayer, Mindgard, Neo and 54 more.

What review platforms show

The headline rating and review count each platform showed in public search results on the day we looked, with the link. We do not read or reproduce the reviews, and a rating is the platform's, not ours.

• G2 · 5.0 out of 5 · 2 reviews^[10]seen November 10, 2026

References

Every fact above cites one of these by number. Tier A is the company itself, a regulator or a filing; tier B is trade or business press.

1. [1]Prompt security partners with f5 to secure genai applications with a firewall for ai 302131373Prompt Security via PR Newswire · prnewswire.com · published April 30, 2024 · Tier A: the company, a regulator or a filing
2. [2]Securing ai promptSentinelOne · sentinelone.com · undated page, accessed September 27, 2026 · Tier A: the company, a regulator or a filing
3. [3]Sentinelone completes acquisition of prompt securitySentinelOne via The Globe and Mail · theglobeandmail.com · published September 5, 2025 · Tier A: the company, a regulator or a filing
4. [4]Prompt Security | From SentinelOnePrompt Security · undated page, accessed October 27, 2026 · Tier A: the company, a regulator or a filing
5. [5]AI Security | AI Glossary | Prompt SecurityPrompt Security · undated page, accessed October 27, 2026 · Tier A: the company, a regulator or a filing
6. [6]ClawSec: A Security Skill Suite for OpenClaw AgentsPrompt Security · undated page, accessed October 27, 2026 · Tier A: the company, a regulator or a filing
7. [7]AI Security Startups Map — Agentic AI Vendors by CategoryPrompt Security · undated page, accessed October 27, 2026 · Tier A: the company, a regulator or a filing
8. [8]About this Map & Methodology — AI Security Startups MapPrompt Security · undated page, accessed October 27, 2026 · Tier A: the company, a regulator or a filing
9. [9]OneClaw DashboardPrompt Security · undated page, accessed November 10, 2026 · Tier A: the company, a regulator or a filing
10. [10]Prompt Security Pros and Cons | User Likes & DislikesG2 · undated page, accessed November 10, 2026 · Tier C

Last verified September 27, 2026. Our code found the quoted passage behind each fact on its source page when the fact was recorded, and re-checks every record against its sources each month.

Recorded September 27, 2026, expanded November 10, 2026 from the references above.

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