CISO Tribune

Vendor comparison · 2 companies

Horizon3.ai vs Tenzai

Horizon3.ai sells NodeZero, a platform that autonomously executes real attack techniques in production environments so organizations can find exploitable weaknesses, fix them and verify the fixes. Tenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software. CISO Tribune files both under Breach simulation and automated pen-testing. 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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  • Horizon3.ai
  • Tenzai
Horizon3.ai vs Tenzai: Products, Customers and Funding Compared
Horizon3.aiHorizon3.ai sells NodeZero, a platform that autonomously executes real attack techniques in production environments so organizations can find exploitable weaknesses, fix them and verify the fixes.horizon3.aiTenzaiTenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software.tenzai.com
What it sells
  • NodeZero[2][3][5][6][7][8][9][10][14]An autonomous platform that executes real attack techniques in production.
  • Endpoint Security Effectiveness[3][7]Tests how endpoint protections respond to real attack behavior.
  • Tenzai[1][3][4][5]An AI agentic penetration testing platform for enterprise software. It discovers exploitable attack chains across web app, mobile, AI, external and internal network attack surfaces.
Categories
Headquarters
San Francisco, United States[1][11]Not stated on its pages
Founded
2019[1][11]2025[2][4][5]
Ownership and funding
Privately held[2][3]Privately held[3]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • November 5, 2026Horizon3 appointed Chris Wood as Director of Sales for Australia and New Zealand and Vivienne Horsfall as Growth Marketing Director for Asia Pacific and Japan.[13]
  • July 29, 2026Horizon3 announced an expansion of its NodeZero platform to include AI-powered web application pentesting capabilities.[14]
  • July 15, 2026Horizon3 announced it is taking part in Anthropic's Project Glasswing, an initiative focused on securing critical infrastructure.[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: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, Horizon3.ai sells mainly to security teams that want to test their defenses with real attacks in production. It names banks, healthcare systems, energy providers, manufacturers, governments and defense contractors as organizations that rely on NodeZero. Its pages describe customers ranging from the Global 100 to a local hospital.Its pages describe an application security team that tests APIs reaching PCI-scoped and critical systems. Tenzai is also described as a way for teams to verify scanner and bug-bounty findings and gather evidence for follow-up. Security teams can match sets of frontier and open-weight models to each test type or application risk level.
Last verified
September 27, 2026November 8, 2026

Where they overlap

  • Breach simulation and automated pen-testing is the primary category of both Horizon3.ai and Tenzai.
  • Both are privately held.

Where they differ, field by field

  • Tenzai is also filed under Penetration testing and red team services.
  • Horizon3.ai lists NodeZero and Endpoint Security Effectiveness. Tenzai lists Tenzai.
  • Horizon3.ai is headquartered in San Francisco, United States.
  • Horizon3.ai was founded in 2019. Tenzai was founded in 2025.

How they differ

CISO Tribune files both Horizon3.ai and Tenzai under Breach simulation and automated pen-testing, and files Tenzai additionally under Penetration testing and red team services. Horizon3.ai sells NodeZero, a platform that autonomously executes real attack techniques in production environments so organizations can find exploitable weaknesses, fix them and verify the fixes. It also sells Endpoint Security Effectiveness, which tests how endpoint protections respond to real attack behavior, and pentesting for compliance delivered by OSCP pentesters together with NodeZero. Tenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software. It looks for exploitable attack chains across web app, mobile, AI, external and internal network attack surfaces, and starts tests in black, gray or white box modes.

Horizon3.ai is headquartered in San Francisco, was founded in 2019, and is privately held. Tenzai is an Israeli AI security startup founded in 2025, and it is privately held. Greylock Partners, Battery Ventures and Lux Capital back Tenzai, which has $75 million in seed funding.

Horizon3.ai names banks, healthcare systems, energy providers, manufacturers, governments and defense contractors as organizations that rely on NodeZero. Tenzai's pages describe an application security team testing APIs that reach PCI-scoped and critical systems, and teams verifying scanner and bug-bounty findings. On July 29, 2026, Horizon3.ai announced an expansion of NodeZero to include AI-powered web application pentesting capabilities. Tenzai has made a formal expansion into network security.

What it sells: Horizon3.ai

What NodeZero does[2][3][5][6][7][8][9][10][14]
NodeZero is described as an autonomous platform capable of executing self-directed actions to achieve an objective. Horizon3.ai says it executes real attack techniques without agents or disruption. It is delivered via multi-tenant SaaS.
What Endpoint Security Effectiveness does[3][7]
NodeZero checks for EDR presence on each host. It then executes techniques ranging from credential theft to privilege escalation and lateral movement. Every action is mapped to a MITRE ATT&CK TTP and labeled blocked or permitted.

What it sells: Tenzai

What Tenzai does[1][3][4][5]
Tenzai's agents are engineered to learn the business purpose and workflows of applications. Tenzai starts autonomous tests in black, gray or white box modes. Tenzai blocks exploitation with a hardened WAF rule that is validated for the customer's environment, ahead of a permanent fix. Tenzai offers step-by-step guidance, coding-assistant prompts and ticket creation for remediation.

Questions about Horizon3.ai and Tenzai

What do Horizon3.ai and Tenzai sell?
Horizon3.ai sells NodeZero and Endpoint Security Effectiveness. Tenzai sells Tenzai.
Are Horizon3.ai and Tenzai in the same category?
Yes. Breach simulation and automated pen-testing is the primary category of both on CISO Tribune.
Where are Horizon3.ai and Tenzai headquartered?
Horizon3.ai is headquartered in San Francisco, United States.
When were Horizon3.ai and Tenzai founded?
Horizon3.ai was founded in 2019. Tenzai was founded in 2025.
Who owns Horizon3.ai and Tenzai?
Horizon3.ai is privately held. Tenzai is privately held.
Who are Horizon3.ai and Tenzai sold to?
From its own pages, Horizon3.ai sells mainly to security teams that want to test their defenses with real attacks in production. Its pages describe an application security team that tests APIs reaching PCI-scoped and critical systems.
What have Horizon3.ai and Tenzai announced recently?
November 5, 2026: Horizon3 appointed Chris Wood as Director of Sales for Australia and New Zealand and Vivienne Horsfall as Growth Marketing Director for Asia Pacific and Japan.

About Horizon3.ai

Horizon3.ai sells NodeZero, a platform that autonomously executes real attack techniques in production environments so organizations can find exploitable weaknesses, fix them and verify the fixes.

Horizon3.ai describes the problem as one of effectiveness. Its pages say that security teams do not have a tools problem, and that many siloed security tools are not designed to work together. The company says the seams between those tools are blind spots that attackers exploit. Horizon3.ai says knowing a vulnerability exists is not enough and that teams need to know whether it is actually exploitable.[5]

NodeZero is described as an autonomous platform capable of executing self-directed actions to achieve an objective. In pentesting, those objectives include becoming Domain Admin, compromising sensitive data and gaining access to critical systems. Horizon3.ai says NodeZero executes real attack techniques without agents or disruption. Horizon3.ai says its autonomous approach is delivered via multi-tenant SaaS.[5]

Horizon3.ai describes a loop of hack, fix, verify and repeat. Its pages say teams should re-test to confirm a threat is gone after a fix. The company also describes a one-click verify tool in NodeZero that starts a targeted retest.[6]

Endpoint Security Effectiveness shows how endpoint protections respond to real attack behavior, and NodeZero checks for EDR presence on each host. Horizon3.ai also sells pentesting for compliance, delivered by OSCP pentesters together with the NodeZero platform.[6][7]

The service delivers a Penetration Test Report and a Fix Action Report.[6]

Horizon3.ai says NodeZero serves customers from the Global 100 to a local hospital. Its pages also name banks, healthcare systems, energy providers, manufacturers, governments and defense contractors as organizations that rely on NodeZero.[5][9]

Horizon3.ai was founded in 2019 and is headquartered in San Francisco, CA. Snehal Antani is its Co-Founder and CEO. The company describes its team as a mix of US Special Operations, US National Security and cybersecurity industry veterans.[4][6][7][8][10]

Horizon3.ai on the record

Sources

Horizon3.ai full record

  1. [1]About usHorizon3.ai · horizon3.ai · undated page, accessed September 27, 2026 · Tier A
  2. [2]Horizon3 raises 250m series e at 2b valuation to lead the ai vs ai cybersecurity eraHorizon3.ai · horizon3.ai · published August 3, 2026 · Tier A
  3. [3]Home | Horizon3.aiHorizon3.ai · undated page, accessed October 25, 2026 · Tier A
  4. [4]Why Continuous Exposure Management Matters for Financial ServicesHorizon3.ai · undated page, accessed October 25, 2026 · Tier A
  5. [5]The Future of Security: Our Vision | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  6. [6]Compliance Solutions for Cybersecurity | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  7. [7]Endpoint Security Effectiveness | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  8. [8]Identity Security Validation | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  9. [9]Why Our Platform Wins | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  10. [10]HomeECB AI Cybersecurity Mandate | NodeZero® | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  11. [11]The Team | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A
  12. [12]Horizon3 Joins Anthropic’s Project Glasswing to Help Defend Critical Infrastructure with the Attacker’s PerspectiveHorizon3 · published July 15, 2026 · Tier A
  13. [13]Horizon3 Expands Australia and New Zealand Team, Strengthens APJ InvestmentHorizon3 · published November 5, 2026 · Tier A
  14. [14]Horizon3’s NodeZero® AI Hacker Extends Production-Safe Autonomous Pentesting to Web ApplicationsHorizon3 · published July 29, 2026 · Tier A

Tenzai full record

  1. [1]Ahead partners with tenzai to strengthen cyber resilience with ai enabled penetration testingTenzai · tenzai.com · published July 23, 2026 · Tier A
  2. [2]tenzai.comTenzai · tenzai.com · undated page, accessed November 8, 2026 · Tier A
  3. [3]Tenzai: Your ultimate AI hacker teammateTenzai · undated page, accessed November 8, 2026 · Tier A
  4. [4]About Tenzai | AI Hacker for Autonomous PentestingTenzai · undated page, accessed November 10, 2026 · Tier A
  5. [5]Tenzai | AI Hacker for EnterpriseTenzai · undated page, accessed November 10, 2026 · Tier A

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