CISO Tribune

Vendor comparison · 2 companies

Impart Security vs Prompt Security

Impart Security sells programmable, deterministic Layer 7 protection across AI, applications and APIs. Prompt Security offers protection for both employee use of AI tools and the apps an organization builds. CISO Tribune files both under AI firewalls and guardrails and AI model and agent security. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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Up to four companies side by side.

  • Impart Security
  • Prompt Security
Impart Security vs Prompt Security: Products, Customers and Funding Compared
Impart SecurityImpart Security sells programmable, deterministic Layer 7 protection across AI, applications and APIs.impart.aiPrompt SecurityPrompt Security offers protection for both employee use of AI tools and the apps an organization builds.prompt.security
What it sells
  • Agent Protection[3][10]Enforces application-specific policies on agent traffic and tool interactions.
  • API Security[5][8][10]Enforces controls based on how APIs behave across requests and sessions.
  • Runtime Defense Harness[10]Uses AI-assisted investigation to develop targeted virtual patches.
  • Prompt Fuzzer[4]An open source tool for AI vulnerability assessment.
Categories
Headquarters
San Francisco, United StatesNot stated on its pages
Founded
Not stated on its pages2023[1]
Ownership and funding
Privately heldOwned by SentinelOne since 2025[3][7][8][10]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pagesNot stated on its pages
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[10]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Impart describes protection that runs inside an organisation's existing ingress. The stated coverage spans AI, applications and APIs. Impart also describes integrating its protection into existing ingress and egress infrastructure, with policies and runtime state synchronized across distributed environments.Not written yet
Last verified
September 27, 2026September 27, 2026

Where they overlap

  • AI firewalls and guardrails is the primary category of both Impart Security and Prompt Security; both are also filed under AI model and agent security.

Where they differ, field by field

  • Impart Security is also filed under Bot and abuse management. Prompt Security is also filed under Workforce AI usage security.
  • Impart Security lists Agent Protection, API Security and Runtime Defense Harness. Prompt Security lists Prompt Fuzzer.
  • Impart Security is headquartered in San Francisco, United States.
  • Prompt Security was founded in 2023.
  • Impart Security is privately held. Prompt Security is owned by SentinelOne, since 2025.

How they differ

CISO Tribune files both Impart Security and Prompt Security under AI firewalls and guardrails as their primary category, and under AI model and agent security as well. Impart Security sells programmable Layer 7 protection across AI, applications and APIs, enforced directly in the application traffic path. Its products include Agent Protection, API Security and Runtime Defense Harness, which uses AI-assisted investigation to develop targeted virtual patches. Impart also covers bots, blocking credential stuffing, scraping and AI-driven automation.

Prompt Security, by contrast, is filed by CISO Tribune additionally under workforce AI usage security. It describes protection for both employee use of AI tools and the apps an organization builds. The product the record names is Prompt Fuzzer, an open source tool for AI vulnerability assessment. Prompt Security also provides a tool that tests and hardens a system prompt against dynamic LLM-based attacks, and a security skill suite for OpenClaw, NanoClaw and Hermes agents. It describes an AI gateway as a centralized layer between users or applications and the AI models they call.

Impart Security is headquartered in San Francisco, United States, and is privately held. Prompt Security was founded in 2023 and has been owned by SentinelOne since 2025. On customers, Impart's record says FanDuel replaced black-box security with Impart, and that Impart offered Crossbeam a single solution for web application, API security and LLM protection. Prompt Security also curates a directory of 471 companies building security for agentic AI, organized across 14 functional categories.

What it sells: Impart Security

What Agent Protection does[3][10]
Agent Protection enforces application-specific policies on agent traffic and tool interactions, using runtime context to restrict unauthorized actions and access. Agent Protection runs on the same ingress-layer enforcement engine that inspects the full attack surface.
What API Security does[5][8][10]
API Security enforces controls based on how APIs behave across requests and sessions, not just individual request signatures. Impart applies inline, sequence-aware enforcement to every API call. API Security detects and blocks shadow APIs as they are accessed. API Security prevents sensitive data (PII) from leaving the system.
What Runtime Defense Harness does[10]
Runtime Defense Harness uses AI-assisted investigation to develop targeted virtual patches and deploy protection through the same engine already protecting the applications. Targeted virtual patches are generated and tested against runtime traffic, with Policy as Code validated before deployment. AI-generated virtual patches are informed by runtime behavior, tested against live traffic and enforced through programmable Layer 7 controls.

What it sells: Prompt Security

What Prompt Fuzzer does[4]
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.

Questions about Impart Security and Prompt Security

What do Impart Security and Prompt Security sell?
Impart Security sells Agent Protection, API Security and Runtime Defense Harness. Prompt Security sells Prompt Fuzzer.
Are Impart Security and Prompt Security in the same category?
Yes. AI firewalls and guardrails is the primary category of both on CISO Tribune.
Where are Impart Security and Prompt Security headquartered?
Impart Security is headquartered in San Francisco, United States.
When were Impart Security and Prompt Security founded?
Prompt Security was founded in 2023.
Who owns Impart Security and Prompt Security?
Impart Security is privately held. Prompt Security is owned by SentinelOne, since 2025.
Who are Impart Security and Prompt Security sold to?
Impart describes protection that runs inside an organisation's existing ingress.

About Impart Security

Impart Security sells programmable, deterministic Layer 7 protection across AI, applications and APIs. Impart enforces security policies directly in the application traffic path. Impart describes one programmable engine that unifies OWASP coverage, stateful behavioral analysis and custom security logic to block threats inline. Impart defines runtime enforcement as the ability to detect and block a threat at the moment the request is made, inline in the path of live traffic. Impart integrates programmable Layer 7 protection into existing ingress and egress infrastructure, enforces deterministic controls locally, and synchronizes policies and runtime state across distributed environments.[4][6][9][10]

For bots, Impart blocks credential stuffing, scraping and AI-driven automation with stateful controls that evaluate request patterns and session behavior. For agents, Impart enforces application-specific policies on agent traffic and tool interactions, using runtime context to restrict unauthorized actions and access. Impart detects and blocks shadow APIs as they are accessed. Impart's API enforcement prevents sensitive data (PII) from leaving the system.[8][10]

Impart sits between the agent and the customer's systems, enforcing security before any action executes. Agent protection runs on the same ingress-layer enforcement engine that inspects the full attack surface. Impart evaluates each prompt using session history, identity, prior model interactions and the chain of tool calls behind it. Impart's LLM enforcement sits inline between the caller and the model and runs before the prompt reaches inference. Impart builds a live catalog of every MCP server reaching the environment, sanctioned or not, and every tool exposed by each one. Policy-as-code in Impart applies the same way to AI clients, CLI users, web apps and direct API callers.[3][5][6][8]

Runtime Defense Harness uses AI-assisted investigation to develop targeted virtual patches and deploy protection through the same engine already protecting the applications. Impart generates and tests targeted virtual patches against runtime traffic, validating Policy as Code before deployment. Impart deploys custom virtual patches in under 60 minutes. Impart executes custom security logic inline using request context and shared session state, and blocks attacks without model inference in the traffic path.[4][10]

Impart runs inside the existing ingress, without adding an extra traffic hop or single point of failure. A lightweight module runs inside the existing ingress controller, capturing HTTP requests after TLS termination and passing them to a local inspector. If the inspector fails or times out, the module fails open. The Impart inspector runs locally alongside the ingress to evaluate request context, runtime state and custom security logic. Enforcement decisions in Impart are deterministic, and no AI inference or cloud round trip is required. Impart Cloud keeps policies and shared state in sync. Impart extends programmable Layer 7 protection to outbound AI requests and agent interactions through supported AI gateway infrastructure. Impart inspects traffic, applies custom security logic and protects sensitive data without replacing the existing gateway, routing or cost controls. The Impart Security plugin runs natively inside Kong Gateway, paired with an Impart Inspector running in the customer's own environment.[5][9][10]

Impart inspects every request to AI applications, web applications and APIs in the traffic path where it sits. The Impart integration with Wiz sends hosts to a Wiz tenant as Imported Assets, next to the cloud resources. Impart sends hostnames to Wiz and does not read Wiz issues, findings or resources. FanDuel replaced black-box security with Impart. Impart offered Crossbeam a single solution for web application, API security and LLM protection.[1][2][3][4][5][6][7][8][9][10]

Impart Security on the record

Sources

Impart Security full record

  1. [1]impart.aiImpart Security · impart.ai · undated page, accessed September 27, 2026 · Tier A
  2. [2]impart.aiImpart Security · impart.ai · undated page, accessed September 27, 2026 · Tier A
  3. [3]Agent Protection - Control AI Agent Behavior | ImpartImpart Security · undated page, accessed September 27, 2026 · Tier A
  4. [4]AI Runtime Defense | Impart Security PlatformImpart Security · undated page, accessed October 25, 2026 · Tier A
  5. [5]LLM Protection | Deterministic Agent Controls | ImpartImpart Security · undated page, accessed October 25, 2026 · Tier A
  6. [6]MCP Protection | Runtime Control for MCP Layer | ImpartImpart Security · undated page, accessed October 25, 2026 · Tier A
  7. [7]WAF for the Agentic Era | Impart SecurityImpart Security · undated page, accessed October 25, 2026 · Tier A
  8. [8]API Security for the Agentic Era | Impart SecurityImpart Security · undated page, accessed October 25, 2026 · Tier A
  9. [9]Integrations with Impart Security | Impart Security Runtime ProtectionImpart Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Programmable Layer 7 Firewall | Impart SecurityImpart Security · undated page, accessed November 10, 2026 · Tier A

Prompt Security full record

  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
  2. [2]Securing ai promptSentinelOne · sentinelone.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Sentinelone completes acquisition of prompt securitySentinelOne via The Globe and Mail · theglobeandmail.com · published September 5, 2025 · Tier A
  4. [4]Prompt Security | From SentinelOnePrompt Security · undated page, accessed October 27, 2026 · Tier A
  5. [5]AI Security | AI Glossary | Prompt SecurityPrompt Security · undated page, accessed October 27, 2026 · Tier A
  6. [6]ClawSec: A Security Skill Suite for OpenClaw AgentsPrompt Security · undated page, accessed October 27, 2026 · Tier A
  7. [7]AI Security Startups Map — Agentic AI Vendors by CategoryPrompt Security · undated page, accessed October 27, 2026 · Tier A
  8. [8]About this Map & Methodology — AI Security Startups MapPrompt Security · undated page, accessed October 27, 2026 · Tier A
  9. [9]OneClaw DashboardPrompt Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Prompt Security Pros and Cons | User Likes & DislikesG2 · undated page, accessed November 10, 2026 · Tier C

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