CISO Tribune

Vendor comparison · 2 companies

Expel vs UnderDefense

Expel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has. 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 MDR and managed SOC. 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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  • Expel
  • UnderDefense
Expel vs UnderDefense: Products, Customers and Funding Compared
ExpelExpel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has.expel.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
  • Expel MDR[5][7]A managed detection and response service that works with the security tools a customer already has.
  • Ruxie[3][5]Expel's AI and automation engine used in its MDR service.
  • 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
Not stated on its pagesNot stated on its pages
Ownership and funding
Not stated on its pagesNot 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: listed, seen November 3, 2026[4]
  • 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
Not written yetUnderDefense 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
September 27, 2026October 26, 2026

Where they overlap

  • MDR and managed SOC is the primary category of both Expel and UnderDefense.

Where they differ, field by field

  • UnderDefense is also filed under Penetration testing and red team services, Compliance automation and SOAR and security automation.
  • Expel lists Expel MDR and Ruxie. UnderDefense lists UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.

How they differ

Expel sells Expel MDR, a managed detection and response service that works in the security tools a customer already has, with 24x7 analysts delivered through its Workbench platform. Expel also names Ruxie as its AI and automation engine, and it offers email threat detection and response. Expel states a 14-minute mean time to remediate and more than 160 technology integrations.

UnderDefense sells an MDR service in which security experts monitor, detect and respond to incidents, alongside UnderDefense MAXI, a security and compliance automation platform. CISO Tribune also files UnderDefense under penetration testing and red team services, compliance automation, and SOAR and security automation. Its other products include UnderDefense Agentic AI SOC, where AI agents investigate each alert and analysts on shift 24/7 decide what happens next, a cloud-based SIEM, and a self-service CIS AWS Benchmark assessment. UnderDefense MAXI provides pre-built compliance templates for standards such as SOC2 and ISO 27001. UnderDefense offers a Starter package that starts at $499 per month.

On the overlap, both companies pair human analysts with automation for alert investigation, and both work with a customer's existing security infrastructure. Expel says customers see every investigation and response in real time inside Workbench, and that analysts can be reached over Slack or Teams. UnderDefense says it serves organizations across five continents and, with CERT-UA, took part in a series of incident response cases.

What it sells: Expel

What Expel MDR does[5][7]
Expel MDR provides 24x7 SOC monitoring, with analysts who investigate and respond. Expel says it connects to an existing stack and correlates threats across endpoint, identity, cloud, network, SaaS and more. Expel states a 14-minute mean time to remediate.
What Ruxie does[3][5]
Expel says Ruxie gathers evidence, enriches alerts and matches patterns in seconds. Expel analysts then investigate and make the critical calls.

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 Expel and UnderDefense

What do Expel and UnderDefense sell?
Expel sells Expel MDR and Ruxie. UnderDefense sells UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.
Are Expel and UnderDefense in the same category?
Yes. MDR and managed SOC is the primary category of both on CISO Tribune.
Who are Expel and UnderDefense sold to?
UnderDefense MAXI integrates with a customer's security infrastructure, including SIEMs, firewalls and endpoint protection solutions.

About Expel

Expel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has. Expel says its service is built so that technology makes it fast and humans make it accurate.[5]

Expel describes the service as managed detection and response with analysts who can be reached directly over Slack or Teams. Expel says customers connect Workbench to their existing stack, and Expel then correlates threats across endpoint, identity, cloud, network, SaaS and more. Expel says no agents need to be deployed and no rip-and-replace is required.[5]

Ruxie is the name Expel gives its AI and automation engine. Expel says Ruxie gathers evidence, enriches alerts and matches patterns so that Expel analysts can investigate and make the critical calls. Expel states a 14-minute mean time to remediate for its MDR service.[5]

Expel Workbench is the platform through which customers see Expel's work. Expel says customers can see every investigation and response in real time inside Workbench.[5]

Expel says its MDR covers cloud, endpoint, identity, network, SaaS, email and more, across more than 160 technology integrations. Expel names Microsoft, AWS, Google Cloud, CrowdStrike, Okta and Wiz among those integrations.[5][10]

Expel also offers email threat detection and response, in which Expel says it monitors the email environment 24x7. Expel says this works alongside Proofpoint, Mimecast, Abnormal Security and Sublime. Expel also describes MDR coverage of the AI attack surface, covering attacker use of AI, employee misuse of AI tools and attacks on customer-built AI systems, with detections mapped to MITRE ATLAS.[6][7]

Expel was started by practitioners. Dave Merkel is co-founder and Chief Executive Officer, Justin Bajko is a co-founder and Chief Strategy Officer, and Yanek Korff is a co-founder and Chief Operating Officer. Greg Notch is Chief Technology Officer.[8]

2. Expel says Workbench infrastructure runs on GCP and AWS in the U.S, and that alert data is retained up to 15 months, configurable per contract.[1][2][5][9]

Expel on the record

Sources

Expel full record

  1. [1]Workbench operations platformExpel · expel.com · published August 5, 2026 · Tier A
  2. [2]Expel announces 20 million in series b fundingExpel · expel.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Leading managed detection and response (MDR) provider | ExpelExpel · undated page, accessed October 24, 2026 · Tier A
  4. [4]Expel Reviews 2026: Details, Pricing, & Features - G2G2 · undated page, accessed October 24, 2026 · Tier C
  5. [5]Managed Detection and Response Services | Expel MDRExpel · undated page, accessed November 3, 2026 · Tier A
  6. [6]Email threat detection | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  7. [7]AI attack surface coverage | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  8. [8]Company | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  9. [9]Security and compliance support from your MDR | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  10. [10]Managed Security Solutions | ExpelExpel · undated page, accessed November 3, 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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