CISO Tribune

Vendor comparison · 2 companies

Harmonic Security vs KnowBe4

Harmonic Security sells AI Governance and Control (AIGC), a control layer that secures and enables the AI-First workforce. KnowBe4 sells attack simulation and training, email and collaboration security, and agent security through the KnowBe4 Platform. CISO Tribune files both under 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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  • Harmonic Security
  • KnowBe4
Harmonic Security vs KnowBe4: Products, Customers and Funding Compared
Harmonic SecurityHarmonic Security sells AI Governance and Control (AIGC), a control layer that secures and enables the AI-First workforce.harmonic.securityKnowBe4KnowBe4 sells attack simulation and training, email and collaboration security, and agent security through the KnowBe4 Platform.knowbe4.com
What it sells
  • Harmonic Command[3]Gives security teams visibility into how employees and agents use AI, plus controls for using the tools safely.
  • MCP Gateway[2][3][4][6]A local gateway that extends Harmonic coverage to MCP activity.
  • Harmonic Endpoint Agent[6]Identifies native AI apps, IDEs, CLI tools, locally hosted models and inference API calls on employee devices.
  • Harmonic Usage Intelligence[8]Groups prompts, files, responses, and supported agent actions into tasks and use cases.
  • Security Awareness Training[4][5][7]Education on recognizing threats, reinforced with phishing and vishing simulations.
  • Cloud Email Security[10]A suite of AI-driven products for inbound and outbound email.
  • Defend[1][4][5][6][10][11]Inbound email protection against phishing, ransomware and business email compromise.
  • Prevent[5][10][12]Outbound email protection and data loss prevention.
  • Compliance Plus[13]Compliance training platform.
  • Student Edition[5]Security awareness training for academic institutions.
  • BreachSim[14]A free tool to identify network vulnerabilities.
  • Weak Password Test[15]A free tool that finds users with weak passwords.
Categories
Headquarters
Not stated on its pagesClearwater, United States
Founded
Not stated on its pages2010[1]
Ownership and funding
Privately heldOwned by Vista Equity Partners since 2023[2][4][8][9]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pages
  • May 5, 2026KnowBe4 launched a two-tier Security Awareness Training offering and a new AI defense agent for custom content creation.[7]
  • April 6, 2026Dashlane announced an integration with KnowBe4 that links credential risk detection to security training for at-risk users.[18]
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 4, 2026[8]
  • Gartner Peer Insights: listed, seen November 4, 2026[9]
Who it fits
Not written yetNot written yet
Last verified
November 3, 2026September 27, 2026

Where they overlap

  • Harmonic Security and KnowBe4 are both filed under AI model and agent security.

Where they differ, field by field

  • Harmonic Security's primary category is Workforce AI usage security; KnowBe4's is Security awareness training.
  • Harmonic Security is also filed under Data loss prevention and AI governance. KnowBe4 is also filed under Human risk management and Email security.
  • Harmonic Security lists Harmonic Command, MCP Gateway, Harmonic Endpoint Agent and Harmonic Usage Intelligence. KnowBe4 lists Security Awareness Training, Cloud Email Security, Defend, Prevent, Compliance Plus and 3 more.
  • KnowBe4 is headquartered in Clearwater, United States.
  • KnowBe4 was founded in 2010.
  • Harmonic Security is privately held. KnowBe4 is owned by Vista Equity Partners, since 2023.

What it sells: Harmonic Security

What Harmonic Command does[3]
Harmonic Command covers workforce AI use across supported browsers, desktop applications, command-line tools, AI APIs, and agentic workflows that use MCP. Harmonic Command intercepts the action and guides the user or agent toward a safer path.
What MCP Gateway does[2][3][4][6]
Supported OpenTelemetry sources and the local MCP Gateway extend Harmonic coverage to additional native, command-line, and MCP activity. The Harmonic MCP Gateway pairs with the Endpoint Agent and applies to agentic workflows. The MCP Gateway runs on Windows, macOS, and Linux.
What Harmonic Endpoint Agent does[6]
The Harmonic Endpoint Agent detects Claude Desktop, Claude Code, Claude Cowork and OpenAI Codex on macOS and Windows. The Endpoint Agent identifies locally hosted models such as Ollama on employee devices and ties that activity to the process and user behind it. Harmonic identifies connections to inference endpoints like OpenAI, Anthropic, Bedrock and Azure AI Foundry.

What it sells: KnowBe4

What Security Awareness Training does[4][5][7]
KnowBe4 says it delivers timely, personalized education that helps people recognize threats. Lessons are reinforced with realistic phishing and vishing simulations.
What Cloud Email Security does[10]
KnowBe4 Cloud Email Security is a suite of AI-driven products designed to detect and prevent advanced email threats across inbound and outbound communication. Contextual banners and prompts are delivered at the point of risk.
What Defend does[1][4][5][6][10][11]
Defend detects and blocks phishing, ransomware and business email compromise with behavioral AI and self-learning threat models. Defend inserts color-coded banners on flagged email and rewrites links, checking them at time of click. Defend integrates with Microsoft Defender for Office 365 through API-based connectivity.
What Prevent does[5][10][12]
Prevent monitors outbound email in real time and alerts users to risky behavior, such as accidental sends or misdirected emails. Prevent is integrated with Microsoft Outlook and Office 365. Prevent Enterprise adds misdirected content detection and custom DLP policies.
What Compliance Plus does[13]
Compliance Plus has a training library of 1000+ items of compliance training content. Compliance Plus offers targeted training for requirements such as HIPAA, PCI and GDPR. Organizations can upload SCORM-compliant content to the KnowBe4 LMS.
What Student Edition does[5]
The KnowBe4 Student Edition enables academic institutions to prepare students to identify and prevent modern cyberattacks. Its training content covers phishing, BYOD risks, password hygiene, social media risks and campus scams.
What BreachSim does[14]
BreachSim is a free tool from KnowBe4 to identify network vulnerabilities. BreachSim tests over 12 realistic data exfiltration scenarios following the MITRE ATT&CK framework.
What Weak Password Test does[15]
The Weak Password Test is a free tool to help IT Administrators know which users have passwords that are easily guessed. It checks the Active Directory and generates a report of users with weak passwords.

Questions about Harmonic Security and KnowBe4

What do Harmonic Security and KnowBe4 sell?
Harmonic Security sells Harmonic Command, MCP Gateway, Harmonic Endpoint Agent and Harmonic Usage Intelligence. KnowBe4 sells Security Awareness Training, Cloud Email Security, Defend, Prevent, Compliance Plus and 3 more.
Are Harmonic Security and KnowBe4 in the same category?
They share AI model and agent security. Harmonic Security's primary category is Workforce AI usage security and KnowBe4's is Security awareness training.
Where are Harmonic Security and KnowBe4 headquartered?
KnowBe4 is headquartered in Clearwater, United States.
When were Harmonic Security and KnowBe4 founded?
KnowBe4 was founded in 2010.
Who owns Harmonic Security and KnowBe4?
Harmonic Security is privately held. KnowBe4 is owned by Vista Equity Partners, since 2023.
What have Harmonic Security and KnowBe4 announced recently?
May 5, 2026: KnowBe4 launched a two-tier Security Awareness Training offering and a new AI defense agent for custom content creation.

About Harmonic Security

Harmonic Security sells AI Governance and Control (AIGC), a control layer that secures and enables the AI-First workforce. Harmonic Security describes a platform that classifies every AI task, discovers why it is used, and controls it in real time. Harmonic Command covers workforce AI use across supported browsers, desktop applications, command-line tools, AI APIs, and agentic workflows that use MCP. Harmonic Command coverage includes ChatGPT, Claude, Copilot, Gemini, Cursor, and more than 1,000 web AI tools.[1][2][3]

Harmonic Command gives security teams visibility into how employees and agents use AI, plus controls for using the tools safely. Supported OpenTelemetry sources and the local MCP Gateway extend Harmonic coverage to additional native, command-line, and MCP activity. The Harmonic MCP Gateway pairs with the Endpoint Agent and applies to agentic workflows. The MCP Gateway runs on Windows, macOS, and Linux.[2][3][4][6]

The Harmonic Endpoint Agent identifies every native AI app, AI-first IDE, CLI tool, locally hosted model and direct inference API call running on employee devices. The Harmonic Endpoint Agent detects Claude Desktop, Claude Code, Claude Cowork and OpenAI Codex on macOS and Windows. Harmonic identifies connections to inference endpoints like OpenAI, Anthropic, Bedrock and Azure AI Foundry, and ties each connection back to the process and user that initiated it. The Endpoint Agent identifies locally hosted models such as Ollama on employee devices and ties that activity to the process and user behind it.[6]

Harmonic secures AI use in the browser with real-time visibility and control over how employees use AI tools. Harmonic identifies the specific account type and subscription plan in use. The Harmonic browser extension finds AI features running inside web apps, such as Magic Write in Canva. Harmonic can warn users as they are about to paste sensitive data, ask for a business justification, or steer them from an unsafe free tool to a sanctioned alternative. The Harmonic browser extension supports Chrome, Edge, Firefox and Safari, plus other Chromium browsers including Arc, Brave, Vivaldi, Island and Genspark.[7]

Harmonic Usage Intelligence groups prompts, files, responses, and supported agent actions into coherent tasks and organization-specific use cases, with views by department, employee, application, approval status, and time. Harmonic builds an inventory of the AI apps a workforce uses, who uses them and for what work. Harmonic records which tools are approved, how policy was applied, what was coached or blocked, and where sensitive data was exposed. Harmonic offers configurable retention, role-based access, employee masking and EU or US hosting. Harmonic does not train on customer data.[5][8][9]

Harmonic uses purpose-built small language models that read the whole prompt or file and interpret the nuance of natural language. Harmonic lets customers enforce enterprise accounts where data is ring-fenced, or restrict uploading corporate context into personal accounts. Harmonic can prevent the upload of protected health information and personally identifiable information to non-compliant models. Harmonic Security says it works with health systems, hospitals, payers and life sciences companies. Harmonic Security says it works with insurance carriers, brokers, MGAs and reinsurers. Harmonic can be deployed through Intune, Jamf, Kandji, or Group Policy.[1][2][3][4][5][8][10][11][12][13]

Harmonic Security on the record

Sources

Harmonic Security full record

  1. [1]Harmonic Security | AI Security for the WorkforceHarmonic Security · undated page, accessed November 3, 2026 · Tier A
  2. [2]Harmonic Security Raises $50 Million Series B Enabling Safe AI Adoption for Millions More EmployeesBusiness Wire · businesswire.com · published October 14, 2026 · Tier A
  3. [3]Harmonic Command: AI Governance & Usage Intelligence Platform | Harmonic SecurityHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  4. [4]Harmonic Explore: AI Usage Visibility & Shadow AI Discovery | Harmonic SecurityHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]Harmonic Guide: Real-Time AI Policy Enforcement & Inline Controls | Harmonic SecurityHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]Endpoint AI Security & ControlHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]Browser-Based GenAI SecurityHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]AI Usage IntelligenceHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI Usage Governance: Enterprise AI Policy & ControlHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]DLP for Generative AIHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]GenAI Compliance for Regulated IndustriesHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]AI Security for HealthcareHarmonic Security · undated page, accessed November 10, 2026 · Tier A
  13. [13]AI Security for InsuranceHarmonic Security · undated page, accessed November 10, 2026 · Tier A

KnowBe4 full record

  1. [1]About usKnowBe4 · knowbe4.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]Vista equity partners completes acquisition of knowbe4KnowBe4 · knowbe4.com · published February 1, 2023 · Tier A
  3. [3]Contact usKnowBe4 · knowbe4.com · undated page, accessed September 27, 2026 · Tier A
  4. [4]KnowBe4 | Secure Your Digital Workforce: Human + AIKnowBe4 · undated page, accessed October 26, 2026 · Tier A
  5. [5]KnowBe4 Student Edition | KnowBe4KnowBe4 · undated page, accessed October 26, 2026 · Tier A
  6. [6]Warning: Attackers Are Using Calendar Invite Files to Evade Security FiltersKnowBe4 · undated page, accessed October 26, 2026 · Tier A
  7. [7]KnowBe4 Launches AI-Native Attack Simulation & Training Product and Twelfth AI AgentBusiness Wire · published May 5, 2026 · Tier A
  8. [8]KnowBe4 Security Awareness Training Reviews 2026 - G2G2 · undated page, accessed October 26, 2026 · Tier C
  9. [9]KnowBe4 Reviews, Ratings & Features 2026 | Gartner Peer InsightsGartner Peer Insights · undated page, accessed October 26, 2026 · Tier C
  10. [10]Cloud Email Security for Microsoft 365 | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  11. [11]Pricing | DefendKnowBe4 · undated page, accessed November 4, 2026 · Tier A
  12. [12]Pricing | Prevent | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  13. [13]Compliance Plus: Compliance Training Platform | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  14. [14]BreachSim | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  15. [15]Weak Password Test | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  16. [16]Security Culture Report Analysis Center | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  17. [17]KnowBe4 Customer Success | KnowBe4KnowBe4 · undated page, accessed November 4, 2026 · Tier A
  18. [18]Dashlane Launches First-of-its-Kind Integration with KnowBe4 to Transform Security Awareness into Proactive DefensePR Newswire · published April 6, 2026 · Tier A

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