CISO Tribune

Vendor comparison · 2 companies

Mindgard vs Prompt Security

Mindgard secures AI models, agents, and applications against exploitable threats. 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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  • Mindgard
  • Prompt Security
Mindgard vs Prompt Security: Products, Customers and Funding Compared
MindgardMindgard secures AI models, agents, and applications against exploitable threats.mindgard.aiPrompt SecurityPrompt Security offers protection for both employee use of AI tools and the apps an organization builds.prompt.security
What it sells
  • AI Red Teaming[1][4][6][10]Mindgard's agentic platform red teams AI systems, agents, and infrastructure.
  • AI Security Expert[9]A subscription that gives a team direct access to a specialist.
  • Prompt Fuzzer[4]An open source tool for AI vulnerability assessment.
Categories
Headquarters
Boston, United States[2]Not stated on its pages
Founded
2022[2][3]2023[1]
Ownership and funding
Privately held[2][3]Owned by SentinelOne since 2025[3][7][8][10]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • August 13, 2026Mindgard announced a $30M Series A funding round.[11]
  • March 17, 2026Mindgard announced an expansion of its AI security platform that adds a reconnaissance capability for AI models, agents and applications.[12]
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
Mindgard addresses organizations that secure the AI systems they build, buy and use. The offering is aimed at pen-testers who scale AI-focused security testing efforts, and at developers who integrate ongoing testing for secure AI deployments. Customer types shown include global insurance brokerages, healthcare AI platforms, global financial institutions, semiconductor manufacturers and enterprise technology services. Reporting is directed to security, engineering, GRC, and audit teams.Not written yet
Last verified
September 27, 2026September 27, 2026

Where they overlap

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

Where they differ, field by field

  • Mindgard'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.
  • Mindgard lists AI Red Teaming and AI Security Expert. Prompt Security lists Prompt Fuzzer.
  • Mindgard is headquartered in Boston, United States.
  • Mindgard was founded in 2022. Prompt Security was founded in 2023.
  • Mindgard is privately held. Prompt Security is owned by SentinelOne, since 2025.

What it sells: Mindgard

What AI Security Expert does[9]
The expert shows how to run posture assessments, enhance tooling usage, build adversarial skills, and co-pilot red teaming efforts. The subscription includes workshops that show security and data science teams how adversarial techniques work, how agentic systems fail, and how defensive controls can be applied.

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 Mindgard and Prompt Security

What do Mindgard and Prompt Security sell?
Mindgard sells AI Red Teaming and AI Security Expert. Prompt Security sells Prompt Fuzzer.
Are Mindgard and Prompt Security in the same category?
They share AI model and agent security and AI firewalls and guardrails. Mindgard's primary category is AI model and agent security and Prompt Security's is AI firewalls and guardrails.
Where are Mindgard and Prompt Security headquartered?
Mindgard is headquartered in Boston, United States.
When were Mindgard and Prompt Security founded?
Mindgard was founded in 2022. Prompt Security was founded in 2023.
Who owns Mindgard and Prompt Security?
Mindgard is privately held. Prompt Security is owned by SentinelOne, since 2025.
Who are Mindgard and Prompt Security sold to?
Mindgard addresses organizations that secure the AI systems they build, buy and use.
What have Mindgard and Prompt Security announced recently?
August 13, 2026: Mindgard announced a $30M Series A funding round.

About Mindgard

Mindgard secures AI models, agents, and applications against exploitable threats. Mindgard combines offensive security expertise, AI red teaming, attacker intelligence, and automated protection to help organizations discover, assess, and mitigate risk across AI models, agents, and applications. Mindgard was created from more than a decade of AI security research at Lancaster University. Mindgard was founded on pioneering research by Dr. Peter Garraghan at Lancaster University, which showed traditional AppSec could not address AI-specific risks. Mindgard's research has produced 150+ publicly disclosed AI vulnerabilities.[1][5]

The Mindgard AI security platform finds, validates, and fixes high-impact AI vulnerabilities. Mindgard operates as an autonomous red teamer, continuously mapping, planning, and executing complex, agentic attack workflows. Mindgard profiles AI systems the way attackers do, mapping models, agents, tools, and behaviors before attack execution. Mindgard automates recon and intelligence gathering on AI systems before adversarial testing to discover instructions, tools, and behaviors attackers can exploit. Mindgard identifies AI models, agents, MCP/A2A servers, connected tools, and shadow AI within products. Mindgard tests AI applications, agents and LLMs, including image, audio and multi-modal models. Mindgard uses reconnaissance and agentic attacks to identify how an attacker could manipulate an agent, access sensitive information, misuse tools, bypass controls, or chain weaknesses together.[1][4][13]

Mindgard validates which weaknesses are exploitable, explains their potential impact, and provides evidence and guidance to help teams close them. AI guardrails and firewalls apply policies to prompts, responses, or actions at runtime, and Mindgard tests whether those controls actually work. Mindgard assesses agents, tools, permissions, APIs, data, and infrastructure beyond the prompt layer. Mindgard evaluates and strengthens AI guardrails and WAF solutions against vulnerabilities.[1][13]

Mindgard deploys through CI/CD, Burp Suite, or a single click. Mindgard integrates into existing workflows with CI/CD automation and a Burp Suite extension. Mindgard uses APIs and integrations to secure models, agents, and AI applications across development and production environments. Mindgard routes findings through APIs, CI/CD, and enterprise workflow integrations into existing security tooling, ticketing systems, and engineering workflows. Mindgard integrates report viewing into existing systems and SIEM. Mindgard supports SAML/SSO, SCIM provisioning, and RBAC to align security testing with organizational compliance standards.[1][4][13][14][15]

Mindgard generates evidence, remediation guidance, and audit-ready reports mapped to OWASP, MITRE, NIST, and AIUC-1. Mindgard discovers and inventories AI applications, models, agents, and shadow AI across an entire environment. Mindgard prioritizes findings by severity, exposure, affected target, business context, and urgency of remediation. Mindgard gives security, engineering, GRC, and audit teams reporting they can use to demonstrate that AI risks and controls are being continuously evaluated. Security teams use Mindgard to discover and remediate high impact risk.[4][15]

Mindgard researchers attack AI systems the way a motivated adversary would, using prompt injection, agent hijacking, tool abuse, data extraction and guardrail bypass, chained into attack paths. Mindgard red teams the whole AI system, not just the model. A single LLM application typically takes two to three weeks from kickoff to report in a Mindgard AI pentest. Mindgard sells a dedicated Technical Account Manager as an annual subscription. Mindgard's AI Security Expert subscription gives a team direct access to a specialist. Mindgard training includes instructor-led workshops where teams build agents, test attacks, configure guardrails, and harden defenses.[6][7][8][9][10][13]

A US insurance brokerage used Mindgard to secure nine production AI models. Mindgard secured Fortune 500 design partners. Mindgard expanded its leadership with CEO James Brear, Head of Research Aaron Portnoy, and Offensive Security Lead Rich Smith. Mindgard lists SOC 2 Type 2. Mindgard says 86% of its staff are on the R&D team and 38% hold PhDs.[1][5][6][7][8][9][10][13][14]

Mindgard on the record

Sources

Mindgard full record

  1. [1]Mindgard - AI Red Teaming & AI Security SolutionsMindgard · undated page, accessed September 27, 2026 · Tier A
  2. [2]About Mindgard: Offensive AI Security CompanyMindgard · undated page, accessed September 27, 2026 · Tier A
  3. [3]Mindgard raises 30 million to protect ai systemsSecurityWeek · securityweek.com · published August 12, 2026 · Tier B
  4. [4]AI Security Software: Advanced AI Testing Tools - MindgardMindgard · undated page, accessed October 26, 2026 · Tier A
  5. [5]AI Security Services: Secure Agentic AI Systems - MindgardMindgard · undated page, accessed October 26, 2026 · Tier A
  6. [6]AI Red Teaming Services for LLMs and Agents - MindgardMindgard · undated page, accessed October 26, 2026 · Tier A
  7. [7]AI Penetration TestingMindgard · undated page, accessed October 26, 2026 · Tier A
  8. [8]AI Security Advisory Services for Enterprise AI - MindgardMindgard · undated page, accessed October 26, 2026 · Tier A
  9. [9]AI Security Consulting Services for Enterprise AI - MindgardMindgard · undated page, accessed October 26, 2026 · Tier A
  10. [10]AI Security TrainingMindgard · undated page, accessed October 26, 2026 · Tier A
  11. [11]Mindgard Raises $30M Series AMindgard · published August 13, 2026 · Tier A
  12. [12]Mindgard Unveils First Autonomous AI Security Platform To Identify And Fix Exploitable VulnerabilitiesBusiness Wire · published March 17, 2026 · Tier A
  13. [13]Offensive Security Tool for AI Systems - MindgardMindgard · undated page, accessed November 10, 2026 · Tier A
  14. [14]Mindgard vs Prompt SecurityMindgard · undated page, accessed November 10, 2026 · Tier A
  15. [15]AI Governance & ComplianceMindgard · 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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