CISO Tribune

Vendor comparison · 2 companies

Tenzai vs UnderDefense

Tenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software. UnderDefense sells UnderDefense MAXI, a security and compliance automation platform, and an MDR service in which security experts monitor, detect and respond to incidents. CISO Tribune files both under Penetration testing and red team services. 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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  • Tenzai
  • UnderDefense
Tenzai vs UnderDefense: Products, Customers and Funding Compared
TenzaiTenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software.tenzai.comUnderDefenseUnderDefense sells UnderDefense MAXI, a security and compliance automation platform, and an MDR service in which security experts monitor, detect and respond to incidents.underdefense.com
What it sells
  • 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.
  • UnderDefense MAXI[1][2][3][5][6]A security and compliance automation platform. UnderDefense MAXI integrates with SIEMs, firewalls and endpoint protection solutions.
  • UnderDefense Agentic AI SOC[4]AI agents investigate each alert. Analysts on shift 24/7 decide what happens next.
  • MDR[1][2][6]Security experts monitor, detect and respond to incidents.
  • Cloud-based SIEM[2]A cloud-based SIEM that collects, analyzes and responds to security events.
  • CIS AWS Benchmark assessment[8]A self-service assessment of AWS security.
Categories
Headquarters
Not stated on its pagesNot stated on its pages
Founded
2025[2][4][5]Not stated on its pages
Ownership and funding
Privately held[3]Not stated on its pages
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pagesNot 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
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.UnderDefense MAXI integrates with a customer's security infrastructure, including SIEMs, firewalls and endpoint protection solutions. UnderDefense offers compliance templates to organizations working toward standards such as SOC2 and ISO 27001. UnderDefense MAXI provides executive-level reports for C-level readers.
Last verified
November 8, 2026October 26, 2026

Where they overlap

  • Tenzai and UnderDefense are both filed under Penetration testing and red team services.

Where they differ, field by field

  • Tenzai's primary category is Breach simulation and automated pen-testing; UnderDefense's is MDR and managed SOC.
  • UnderDefense is also filed under Compliance automation and SOAR and security automation.
  • Tenzai lists Tenzai. UnderDefense lists UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.
  • Tenzai was founded in 2025.
  • Tenzai is privately held.

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.

What it sells: UnderDefense

What UnderDefense MAXI does[1][2][3][5][6]
UnderDefense MAXI natively monitors endpoints, networks, users and decoy beacons. UnderDefense MAXI provides ready-to-use playbooks, AI-powered alert enrichment and notifications through Slack, Jira or a preferred tool. UnderDefense MAXI provides pre-built compliance templates for standards such as SOC2 and ISO 27001.
What UnderDefense Agentic AI SOC does[4]
UnderDefense Agentic AI SOC uses AI agents that investigate each alert. Analysts on shift 24/7 decide what happens next.
What CIS AWS Benchmark assessment does[8]
UnderDefense offers a self-service CIS AWS Benchmark assessment. The assessment covers evaluating the maturity of cloud security controls, identifying misconfigurations, providing detailed mitigation instructions and giving a summary table with a final CVSS v3.0 score.

Questions about Tenzai and UnderDefense

What do Tenzai and UnderDefense sell?
Tenzai sells Tenzai. UnderDefense sells UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.
Are Tenzai and UnderDefense in the same category?
They share Penetration testing and red team services. Tenzai's primary category is Breach simulation and automated pen-testing and UnderDefense's is MDR and managed SOC.
When were Tenzai and UnderDefense founded?
Tenzai was founded in 2025.
Who owns Tenzai and UnderDefense?
Tenzai is privately held.
Who are Tenzai and UnderDefense sold to?
Its pages describe an application security team that tests APIs reaching PCI-scoped and critical systems. UnderDefense MAXI integrates with a customer's security infrastructure, including SIEMs, firewalls and endpoint protection solutions.

About Tenzai

Tenzai sells an AI agentic penetration testing platform that hacks, exploits and fixes vulnerabilities across enterprise software. Tenzai discovers attack surfaces, chains weaknesses and produces reproducible exploits. Tenzai is an Israeli AI security startup founded in 2025.

Tenzai was founded in 2025 by cybersecurity veterans Pavel Gurvich, Ariel Zeitlin, Ofri Ziv, Itamar Tal and Aner Mazur. Greylock Partners, Battery Ventures and Lux Capital back Tenzai, with Asheem Chandna of Greylock and Scott Tobin of Battery on the board. Tenzai has $75 million in seed funding.[1]

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 tailors each test to the customer's goals, guidelines and organizational context. Tenzai shows the reasoning, assumptions and evidence gathered at every step of a test. Tenzai applies layered guardrails that enforce scope at the network level and check every action, following the customer's rules of engagement. Tenzai learns the customer's environment and the team's input from past runs. Tenzai finds business logic vulnerabilities and complex attack chains.

Tenzai discovers exploitable attack chains across web app, mobile, AI, external and internal network attack surfaces. For web apps, Tenzai traces attack paths from the browser through server-side logic to the database. For mobile apps, Tenzai tests Android apps on emulated devices to find runtime vulnerabilities. Tenzai applies static analysis to Android and iOS apps to uncover mobile attack surface. Tenzai tests MCP tools for poisoning, unauthorized access and exploitable inputs.

Tenzai looks for exploitable gaps in how APIs handle identities, permissions and multi-step workflows. For external networks, Tenzai continuously tracks internet-facing assets, starting from domains and public IP ranges.

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. Tenzai guides the permanent fix and re-tests it. Tenzai deploys WAF rule mitigations and guides permanent remediation through security platforms including Akamai Technologies. Tenzai has made a formal expansion into network security.

Tenzai checks every update in an app, and only what has changed, with incremental runs. Tenzai makes scanner and bug-bounty findings actionable by verifying exploitability and gathering evidence for follow-up. Tenzai curates and benchmarks sets of frontier and open-weight models that security teams can match to each test type or application risk level.[1]

Tenzai on the record

Sources

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

UnderDefense full record

  1. [1]underdefense.comUnderDefense · underdefense.com · undated page, accessed October 26, 2026 · Tier A
  2. [2]Compliance PricingUnderDefense · undated page, accessed November 10, 2026 · Tier A
  3. [3]Agentic AI SOC & Compliance Automation Platform | UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  4. [4]Elastic Cloud Pricing 2026: Serverless, Hosted, and SIEMUnderDefense · undated page, accessed November 10, 2026 · Tier A
  5. [5]Cloudflare Pricing 2026: WAF, Zero Trust, and EnterpriseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  6. [6]Palo Alto Networks Pricing 2026: Firewalls, SASE, and XDRUnderDefense · undated page, accessed November 10, 2026 · Tier A
  7. [7]2025 MXDR Pricing Guide: Choosing the Right MXDR providerUnderDefense · undated page, accessed November 10, 2026 · Tier A
  8. [8]Episode 4: Cyber Resilience 201 — AWS Cloud Security - UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  9. [9]E-Mail Under Attack - UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  10. [10]UnderDefense MAXI Reviews & Product DetailsG2 · undated page, accessed November 10, 2026 · Tier C

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