CISO Tribune

Vendor comparison · 2 companies

Fleuret AI vs Horizon3.ai

Fleuret AI sells pentesting that combines artificial intelligence and offensive expertise. 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. 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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  • Fleuret AI
  • Horizon3.ai
Fleuret AI vs Horizon3.ai: Products, Customers and Funding Compared
Fleuret AIFleuret AI sells pentesting that combines artificial intelligence and offensive expertise.fleuret.aiHorizon3.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.ai
What it sells
  • Émile[4][6]Runs pentests on applications, APIs and infrastructure and ships a replayable exploit with every finding.
  • Hortense[4][5][6]Tells customers what to test next, and when.
  • 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.
Categories
Headquarters
Not stated on its pagesSan Francisco, United States[1][11]
Founded
Not stated on its pages2019[1][11]
Ownership and funding
Privately heldPrivately held[2][3]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • October 5, 2026Fleuret AI closed a €4M pre-seed round led by RAISE Ventures, with participation from Auriga Cyber Ventures, Wind Capital and Better Angle.[2]
  • 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]
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
Its published guides address CISOs at credit institutions and at SaaS companies. Fleuret describes its service as adding to the people already in place, such as a customer's team, MSSP or PASSI-certified firm. Its reports are signed and mapped to DORA, NIS2 and ISO 27001. Hosting and inference run on Scaleway in Paris.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.
Last verified
October 21, 2026September 27, 2026

Where they overlap

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

Where they differ, field by field

  • Fleuret AI is also filed under Penetration testing and red team services, Static application security testing and Dynamic application security testing.
  • Fleuret AI lists Émile and Hortense. Horizon3.ai lists NodeZero and Endpoint Security Effectiveness.
  • Horizon3.ai is headquartered in San Francisco, United States.
  • Horizon3.ai was founded in 2019.

How they differ

CISO Tribune files Fleuret AI under breach simulation and automated pen-testing, along with penetration testing and red team services, static application security testing and dynamic application security testing. Fleuret AI sells Émile, which runs pentests on applications, APIs and infrastructure and ships a replayable exploit with every finding, and Hortense, which tells customers what to test next, and when. Horizon3.ai sells NodeZero, an autonomous platform that executes real attack techniques in production, and Endpoint Security Effectiveness, which tests how endpoint protections respond to real attack behavior. Horizon3.ai also sells pentesting for compliance, delivered by OSCP pentesters together with NodeZero.

Horizon3.ai was founded in 2019 and is headquartered in San Francisco, CA. Both companies are privately held. Fleuret AI's published guides address CISOs at credit institutions and at SaaS companies, and its reports are mapped to DORA, NIS2 and ISO 27001. Horizon3.ai says NodeZero serves customers from the Global 100 to a local hospital, and names banks, healthcare systems, energy providers, manufacturers, governments and defense contractors.

On July 29, 2026, Horizon3.ai announced an expansion of NodeZero to include AI-powered web application pentesting capabilities. On July 15, 2026, it announced it is taking part in Anthropic's Project Glasswing.

What it sells: Fleuret AI

What Émile does[4][6]
A separate validator confirms every finding with a non-destructive exploit. Every finding ships with a working, replayable exploit. Each finding lands as a ticket with its exploit, an owner and a remediation, pushed to Jira, Linear or Slack.
What Hortense does[4][5][6]
Hortense maps a customer's estate from domain to database. Hortense crosses what changed in the code with what is exposed on the internet and what past pentests found. Hortense prepares the scope, and a person with launch rights starts the pentest, which Émile runs. Hortense comes with every yearly plan.

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.

Questions about Fleuret AI and Horizon3.ai

What do Fleuret AI and Horizon3.ai sell?
Fleuret AI sells Émile and Hortense. Horizon3.ai sells NodeZero and Endpoint Security Effectiveness.
Are Fleuret AI and Horizon3.ai in the same category?
Yes. Breach simulation and automated pen-testing is the primary category of both on CISO Tribune.
Where are Fleuret AI and Horizon3.ai headquartered?
Horizon3.ai is headquartered in San Francisco, United States.
When were Fleuret AI and Horizon3.ai founded?
Horizon3.ai was founded in 2019.
Who owns Fleuret AI and Horizon3.ai?
Fleuret AI is privately held. Horizon3.ai is privately held.
Who are Fleuret AI and Horizon3.ai sold to?
Its published guides address CISOs at credit institutions and at SaaS companies. From its own pages, Horizon3.ai sells mainly to security teams that want to test their defenses with real attacks in production.
What have Fleuret AI and Horizon3.ai announced recently?
October 5, 2026: Fleuret AI closed a €4M pre-seed round led by RAISE Ventures, with participation from Auriga Cyber Ventures, Wind Capital and Better Angle. 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 Fleuret AI

Fleuret AI sells pentesting that combines artificial intelligence and offensive expertise. Fleuret uses agentic AI to simulate real attacks on its customers' systems. Émile runs pentests on customer applications, APIs and infrastructure and ships a replayable exploit with every finding. Hortense tells customers what to test next, and when. Fleuret states that its service is built and hosted in Europe.[1][3][4]

A separate validator confirms every finding with a non-destructive exploit. Several agents test the surface at once and reproduce every finding before it is reported. Every finding ships with a working, replayable exploit, and a finding that cannot be reproduced is left out of the report. Fleuret states that proofs of concept are read-only and non-destructive. Fleuret states that its orchestration is deterministic code, not a free-running model, and that it ends in a signed report.[4][5]

Each finding becomes a ticket with its exploit, an owner and a remediation, pushed to Jira, Linear or Slack. Customers can launch a full pentest the day an application changes and can re-test a fix whenever they want. Fleuret reports contain a replayable exploit for every finding, logged re-tests, the coverage of what was tested and held, and a signed report mapped to DORA, NIS2 and ISO 27001.[4]

Hortense maps a customer's estate from domain to database and crosses what changed in the code with what is exposed on the internet and what past pentests found. Hortense connects what a customer already has into a view of risk: what to test, what to fix first, what can wait, and why. For each application, Hortense weighs the last pentest, what changed since, and how close it sits to a crown jewel. Hortense then recommends a pentest with its reasons and prepares it, and the customer approves it. Hortense prepares the scope, and a person with launch rights starts the pentest, which Émile runs. Hortense comes with every yearly plan.[1][4][6]

Fleuret sells pentests from 4,000 euros per test. Each extra credit costs €4,000, whatever the plan. Credits are valid for the subscription year and do not carry over to the next one. A first pentest is credited in full against a yearly plan taken within 60 days.[5][7]

Hosting and inference run on Scaleway in Paris, which Fleuret describes as a European provider. Fleuret runs open-weight models (gpt-oss, Kimi K2.5) on H100 GPUs at Scaleway in Paris. Engagement data does not leave that environment to reach a third-party model API. Engagement data, namely vulnerabilities, exploitation evidence and reports, is retained for 18 months in a per-client segmented European environment, then deleted. Fleuret AI states that stored data is encrypted with AES-256 and that communications use TLS 1.2 or higher. Fleuret AI states that its production data is hosted in data centers within the European Union. Fleuret AI states that it is compliant with the General Data Protection Regulation. Fleuret AI gives its address as 60 Rue François 1er, 75008 Paris, France.[4][8]

Fleuret AI publishes practical guides for CISOs scoping penetration testing under DORA, NIS2, ISO 27001, SOC 2 and PCI DSS. One guide covers how SaaS CISOs decide scope and evidence pentest against Article 21(2)(e) and 21(2)(f).[1][4][5][9]

Fleuret AI on the record

Sources

Fleuret AI full record

  1. [1]fleuret.aiFleuret AI · fleuret.ai · undated page, accessed October 21, 2026 · Tier A
  2. [2]Fleuret raises €4M pre-seed for agentic pentestingFleuret AI · published October 5, 2026 · Tier A
  3. [3]About Fleuret | Agentic AI pentestingFleuret AI · undated page, accessed November 10, 2026 · Tier A
  4. [4]Fleuret | AI-powered automated pentestingFleuret AI · undated page, accessed November 10, 2026 · Tier A
  5. [5]Pricing | Pentest credits, platform included | FleuretFleuret AI · undated page, accessed November 10, 2026 · Tier A
  6. [6]Hortense, your offsec brain | Know what to test next, and when | FleuretFleuret AI · undated page, accessed November 10, 2026 · Tier A
  7. [7]SOC 2 and ISO 27001 cost calculator | FleuretFleuret AI · undated page, accessed November 10, 2026 · Tier A
  8. [8]Security Policy | FleuretFleuret AI · published March 11, 2026 · Tier A
  9. [9]Compliance Pentest Guides | DORA, NIS2, ISO 27001 | FleuretFleuret AI · undated page, accessed November 10, 2026 · Tier A

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

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