CISO Tribune

Vendor comparison · 2 companies

HiddenLayer vs Prompt Security

HiddenLayer sells AI security that analyzes AI applications, models, and assets, identifies their risks, and protects them as teams build. Prompt Security offers protection for both employee use of AI tools and the apps an organization builds. CISO Tribune files both under AI model and agent security and AI firewalls and guardrails. 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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  • HiddenLayer
  • Prompt Security
HiddenLayer vs Prompt Security: Products, Customers and Funding Compared
HiddenLayerHiddenLayer sells AI security that analyzes AI applications, models, and assets, identifies their risks, and protects them as teams build.hiddenlayer.comPrompt SecurityPrompt Security offers protection for both employee use of AI tools and the apps an organization builds.prompt.security
What it sells
  • Model Scanning[1][4][6]Scans third-party and proprietary machine learning models to detect hidden risks.
  • Red Teaming[1][6][10]Runs continuous testing intended to identify threats early and validate AI defenses.
  • AI Guardrails[1][11]Applies policy-based controls intended to prevent misuse, data leakage and adversarial attacks on AI systems.
  • Agentic and MCP Protection[1][4][5][6]Monitors autonomous AI agents and MCP connections and is intended to guard against rogue behavior.
  • Prompt Fuzzer[4]An open source tool for AI vulnerability assessment.
Categories
Headquarters
Austin, United States[2]Not stated on its pages
Founded
2022[2]2023[1]
Ownership and funding
Privately held[3]Owned by SentinelOne since 2025[3][7][8][10]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • August 12, 2026HiddenLayer announced the appointment of Mike Gesnaldo as Chief Revenue Officer.[14]
Not 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
HiddenLayer describes securing AI used for fraud detection, trading, compliance, and customer engagement. HiddenLayer offers protection of agentic, generative, and predictive AI systems for mission assurance. HiddenLayer describes deployment through APIs, gateways, SDKs, or lightweight on-device integrations.Not written yet
Last verified
November 2, 2026September 27, 2026

Where they overlap

  • HiddenLayer and Prompt Security are both filed under AI model and agent security and AI firewalls and guardrails.

Where they differ, field by field

  • HiddenLayer's primary category is AI model and agent security; Prompt Security's is AI firewalls and guardrails.
  • Prompt Security is also filed under Workforce AI usage security.
  • HiddenLayer lists Model Scanning, Red Teaming, AI Guardrails and Agentic and MCP Protection. Prompt Security lists Prompt Fuzzer.
  • HiddenLayer is headquartered in Austin, United States.
  • HiddenLayer was founded in 2022. Prompt Security was founded in 2023.
  • HiddenLayer is privately held. Prompt Security is owned by SentinelOne, since 2025.

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 HiddenLayer and Prompt Security

What do HiddenLayer and Prompt Security sell?
HiddenLayer sells Model Scanning, Red Teaming, AI Guardrails and Agentic and MCP Protection. Prompt Security sells Prompt Fuzzer.
Are HiddenLayer and Prompt Security in the same category?
They share AI model and agent security and AI firewalls and guardrails. HiddenLayer's primary category is AI model and agent security and Prompt Security's is AI firewalls and guardrails.
Where are HiddenLayer and Prompt Security headquartered?
HiddenLayer is headquartered in Austin, United States.
When were HiddenLayer and Prompt Security founded?
HiddenLayer was founded in 2022. Prompt Security was founded in 2023.
Who owns HiddenLayer and Prompt Security?
HiddenLayer is privately held. Prompt Security is owned by SentinelOne, since 2025.
Who are HiddenLayer and Prompt Security sold to?
HiddenLayer describes securing AI used for fraud detection, trading, compliance, and customer engagement.
What have HiddenLayer and Prompt Security announced recently?
August 12, 2026: HiddenLayer announced the appointment of Mike Gesnaldo as Chief Revenue Officer.

About HiddenLayer

HiddenLayer sells AI security that analyzes AI applications, models, and assets, identifies their risks, and protects them as teams build. HiddenLayer builds an inventory of the AI applications, models, and assets in a customer environment. HiddenLayer offers a firewall that monitors, detects, and responds in real time to adversarial threats on agentic and generative AI applications. HiddenLayer continually identifies threats and validates defenses for agentic and generative AI applications.[1]

HiddenLayer says developers are embedding AI into tools and workflows faster than security teams can track. HiddenLayer says third-party models introduce unknown code and vulnerabilities. HiddenLayer says coding agents can read sensitive files, execute shell commands, install dependencies, or expose credentials. HiddenLayer says attackers can manipulate AI systems through prompts, retrieved content, tool output, or other untrusted inputs.[1][4][5]

HiddenLayer automatically builds a living inventory of AI across an environment, including shadow AI. HiddenLayer scans cloud accounts, repos, endpoints, and pipelines to detect every model and associated agent. HiddenLayer scans AWS, Azure, GCP, VMs, containers, and APIs for AI assets. HiddenLayer automatically associates AI assets with owners, business units, sensitivity, and risk levels. HiddenLayer aligns AI assets with NIST, OWASP, and ATLAS frameworks.[6][7]

HiddenLayer analyzes models for malware, vulnerabilities, backdoors, and unknown components before they reach production. HiddenLayer scans model files and URLs for malware, CVEs, backdoors, and integrity issues before deployment. HiddenLayer analyzes architectures, layers, weights, and artifacts for tampering or anomalies. HiddenLayer tests commercial models for safety and security before integration. HiddenLayer identifies where models come from, including origin and licensing.[4][6][7][8]

HiddenLayer continuously tests AI systems against evolving attacks and uncovers weaknesses early. HiddenLayer tests for jailbreaks, injection, role confusion, and harmful response patterns. HiddenLayer probes for extraction of PHI, PII, or proprietary data. HiddenLayer simulates unauthorized actions through agent tools and APIs.[6][9][10]

HiddenLayer detects and responds to AI attacks in production. HiddenLayer monitors prompts, outputs, memory, and agent actions in real time to detect and block prompt injection, data leakage, model theft, and unsafe tool use. HiddenLayer observes and reconstructs agent interactions across tools, data, and workflows in real time. HiddenLayer detects, blocks, or redacts unsafe actions and sensitive information according to policy and platform capabilities. HiddenLayer integrates runtime detections and enforcement events with existing SIEM, SOAR, and security operations workflows. HiddenLayer extends Runtime Security into AI coding agents through lightweight, on-device integration.[5][6][10]

HiddenLayer enforces boundaries around content, toxicity, bias, and regulatory restrictions. HiddenLayer detects and prevents PII, PHI, and proprietary data exposure in generated content. HiddenLayer enforces safe, compliant, and policy aligned AI behavior across applications, models, and business units. HiddenLayer combines safety guardrails with real time threat detection and prompt injection blocking. HiddenLayer protects autonomous agents and MCP based systems from prompt injection, unsafe tool use, and harmful autonomous actions.[1][6][11]

HiddenLayer says its platform deploys across any architecture without exposing intellectual property, weights, prompts, or customer data. HiddenLayer offers deployment through APIs, gateways, SDKs, or lightweight on-device integrations. HiddenLayer offers services modeled after active adversarial campaigns targeting enterprise AI applications. HiddenLayer services evaluate every layer from AI asset discovery to data and model supply chains to runtime environments. HiddenLayer services provide detailed remediation playbooks tailored to models, infrastructure, and compliance needs. HiddenLayer services work in concert with the HiddenLayer AI Security Platform for ongoing protection. HiddenLayer services align with emerging AI governance standards, including NIST AI RMF and EU AI Act requirements.[4][6][12]

HiddenLayer describes securing AI used for fraud detection, trading, compliance, and customer engagement. HiddenLayer describes establishing governance controls aligned with FFIEC and OCC frameworks. HiddenLayer detects malware, tampered artifacts, and backdoored weights in pretrained models and libraries. HiddenLayer protects agentic, generative, and predictive AI systems for mission assurance.[1][4][6][10][13]

HiddenLayer on the record

Sources

HiddenLayer full record

  1. [1]HiddenLayer | Total AI SecurityHiddenLayer · undated page, accessed September 27, 2026 · Tier A
  2. [2]Hiddenlayer launches the first security solution to protect ai powered products 301587864HiddenLayer via PR Newswire · prnewswire.com · published July 19, 2022 · Tier A
  3. [3]Hiddenlayer 100m series b ai securityHiddenLayer · hiddenlayer.com · undated page, accessed September 27, 2026 · Tier A
  4. [4]Application Developers | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  5. [5]AI Runtime Security | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  6. [6]Platform | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  7. [7]AI Discovery | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  8. [8]AI Supply Chain Security | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI Attack Simulation | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  10. [10]CISO | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  11. [11]AI Guardrails | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  12. [12]Services | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  13. [13]Financial Services | HiddenLayerHiddenLayer · undated page, accessed November 10, 2026 · Tier A
  14. [14]HiddenLayer Appoints Mike Gesnaldo as Chief Revenue OfficerHiddenLayer · published August 12, 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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