CISO Tribune

Vendor comparison · 2 companies

Critical Start vs Expel

Critical Start sells managed detection and response (MDR) that combines AI-powered triage with human-led investigation. 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. 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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  • Critical Start
  • Expel
Critical Start vs Expel: Products, Customers and Funding Compared
Critical StartCritical Start sells managed detection and response (MDR) that combines AI-powered triage with human-led investigation.criticalstart.comExpelExpel 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.com
What it sells
  • CORR Platform[4]The MDR platform that gives a security operations team visibility into every alert, investigation and response action.
  • Managed Detection and Response[3][10][11]MDR that combines AI-powered triage with human-led investigation.
  • Service Credits[7]A prepaid, flexible currency included in every managed service contract.
  • Vulnerability Management Services[3]Vulnerability management delivered under the same tier structure as MDR.
  • MobileSOC[12]A native iOS and Android application for real-time security operations management.
  • 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.
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
  • July 22, 2026Critical Start announced the appointment of Francine Geist as Chief Executive Officer, effective immediately.[9]
  • June 3, 2026Critical Start released SOC AI, a multi-agent framework that powers its AI-led managed detection and response service.[11]
  • June 2, 2026Critical Start released SOC AI, a multi-agent framework that powers its AI-led managed detection and response service.[10]
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: listed, seen November 3, 2026[4]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, Critical Start sells mainly to organizations that need accountability from a managed security provider, with contractual SLA commitments as the central offer. The company says it protects financial services firms, healthcare systems, manufacturers and utilities. For financial institutions, it describes ransomware, wire fraud and insider threats as the threats its MDR addresses. Its compliance reporting covers frameworks such as PCI DSS, HIPAA and NERC CIP, which points to regulated buyers. Critical Start MDR works with the customer's existing tools, so it suits teams that want to keep the security products they already run.Not written yet
Last verified
September 27, 2026September 27, 2026

Where they overlap

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

Where they differ, field by field

  • Critical Start lists CORR Platform, Managed Detection and Response, Service Credits, Vulnerability Management Services and MobileSOC. Expel lists Expel MDR and Ruxie.

How they differ

CISO Tribune files both Critical Start and Expel under MDR and managed SOC, with that as the primary category for each. Critical Start sells managed detection and response that combines AI-powered triage with human-led investigation, and it backs every response time with a contractual SLA. Expel sells managed detection and response delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has. Critical Start says its CORR platform connects through API-based integrations with no agents to deploy, and Expel says no agents need to be deployed for its service.

Critical Start also sells MobileSOC, a native iOS and Android application, and Vulnerability Management Services under the same tier structure as MDR. Expel instead lists email threat detection and response, which it says works alongside Proofpoint, Mimecast, Abnormal Security and Sublime. Expel states a 14-minute mean time to remediate for its MDR service. Expel says its MDR spans more than 160 technology integrations, naming Microsoft, AWS, Google Cloud, CrowdStrike, Okta and Wiz.

Critical Start says it protects financial services firms, healthcare systems, manufacturers and utilities. Critical Start lists SOC AI, a multi-agent framework behind its AI-led managed detection and response service, with release dates of June 2, 2026 and June 3, 2026. On July 22, 2026, Critical Start announced the appointment of a Chief Executive Officer, effective immediately.

What it sells: Critical Start

What CORR Platform does[4]
CORR connects to a security stack through native APIs, with no proprietary agents and no forced replacements. It works through API-based integrations, with no agents to deploy and no additional infrastructure to manage.
What Managed Detection and Response does[3][10][11]
Critical Start MDR combines AI-powered triage with human-led investigation and backs every response time with a contractual SLA. Analysts contain threats directly in the customer's tools through 30+ advanced integrations.
What Service Credits does[7]
Every managed service contract includes service credits that can be spent across 30+ services. MDR for Endpoint, MDR for SIEM and VMS each include credits. Credits stack into a single bank when a customer has more than one.

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.

Questions about Critical Start and Expel

What do Critical Start and Expel sell?
Critical Start sells CORR Platform, Managed Detection and Response, Service Credits, Vulnerability Management Services and MobileSOC. Expel sells Expel MDR and Ruxie.
Are Critical Start and Expel in the same category?
Yes. MDR and managed SOC is the primary category of both on CISO Tribune.
Who are Critical Start and Expel sold to?
From its own pages, Critical Start sells mainly to organizations that need accountability from a managed security provider, with contractual SLA commitments as the central offer.
What have Critical Start and Expel announced recently?
July 22, 2026: Critical Start announced the appointment of Francine Geist as Chief Executive Officer, effective immediately.

About Critical Start

Critical Start sells managed detection and response (MDR) that combines AI-powered triage with human-led investigation. The company says tools produce thousands of alerts every day, and that Critical Start MDR works to resolve every one and backs every response time with a contractual SLA.[2][6]

CORR is the MDR platform that Critical Start uses to give a security operations team visibility into every alert, every investigation and every response action. CORR connects to a security stack through native APIs, with no proprietary agents and no forced replacements. Critical Start says CORR connects to an existing stack through API-based integrations, with no agents to deploy, no network architecture changes and no additional infrastructure to manage.[1][4][5]

More than 30 of these are advanced integrations where Critical Start analysts contain threats directly in the customer's tools. Inside the platform, AI agents analyze enriched case data, including URL analysis, suggested verdicts and investigation summaries. A certified SOC analyst validates every finding, with two-person verification on critical alerts. The Trusted Behavior Registry uses deterministic behavioral validation to auto-resolve 99.83% of known-good behaviors before a human analyst sees them.[5]

Critical Start also offers MobileSOC, a native iOS and Android application for real-time security operations management. CORR supports compliance reporting for SOC 2, ISO 27001, PCI DSS, HIPAA, GLBA, CMMC and NERC CIP.

Every managed service follows an Essentials, Enterprise and Signature packaging model. That tier structure applies across MDR for Endpoint, MDR for SIEM and Vulnerability Management Services (VMS).

Every Critical Start managed service contract includes service credits, a prepaid, flexible currency that can be spent across 30+ services. Essentials includes 5 credits, Enterprise includes 10 credits and Signature includes 20 credits per subscription. MDR for Endpoint, MDR for SIEM and VMS each include credits, and credits stack into a single bank when a customer holds more than one.[7]

Critical Start says that in 2012 three security experts who had led incident response and threat hunting at Fortune 500 companies recognized a gap in the market. The company says it protects financial services firms, healthcare systems, manufacturers and utilities across 7 continents. For financial institutions, Critical Start delivers MDR with contractual SLAs and audit-grade investigation documentation.[4][5][6][8]

Critical Start on the record

Sources

Critical Start full record

  1. [1]PlatformCritical Start · criticalstart.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]Critical Start | Managed Detection and Response (MDR)Critical Start · undated page, accessed October 24, 2026 · Tier A
  3. [3]Managed Security Services | Critical StartCritical Start · undated page, accessed October 24, 2026 · Tier A
  4. [4]Security Integrations | Critical StartCritical Start · undated page, accessed October 24, 2026 · Tier A
  5. [5]Security Solutions by Environment | Critical StartCritical Start · undated page, accessed October 24, 2026 · Tier A
  6. [6]About Critical Start | Cybersecurity CompanyCritical Start · undated page, accessed October 24, 2026 · Tier A
  7. [7]Service Credits: Flexible Security Currency | Critical StartCritical Start · undated page, accessed October 24, 2026 · Tier A
  8. [8]MDR for Finance: PCI, SOX, SOC 2 | Critical StartCritical Start · undated page, accessed October 24, 2026 · Tier A
  9. [9]Critical Start Appoints Francine Geist as Chief Executive OfficerCritical Start · published July 22, 2026 · Tier A
  10. [10]Critical Start Delivers SOC AI: A Production-Proven Agentic Architecture Built for Auditable, Human-Validated MDRBusiness Wire · published June 2, 2026 · Tier A
  11. [11]Critical Start expands MDR capabilities with multi-agent AI systemHelp Net Security · published June 3, 2026 · Tier B
  12. [12]CORR Platform: See Everything. Question Nothing. | Critical StartCritical Start · undated page, accessed November 5, 2026 · Tier A

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

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