Quorum Cyber MDR
Brings own platformShips their own detection and response stack. You deploy their agent — they operate it.Clarity MDR
Microsoft-native MDR built entirely on Sentinel and Defender, delivered through three tiers: Clarity Defend (SMB), Clarity Extend (mid-market with some third-party telemetry via Sentinel connectors), and Clarity Protect (full enterprise MXDR). Founded in Edinburgh in 2016 and PE-backed by Charlesbank ($270M, 2024), Quorum Cyber won Microsoft Security MSSP of the Year 2025 and was the first UK company to earn Microsoft Verified MXDR status.
Best For
Ideal for
- Microsoft-committed organizations (E3/E5) wanting MDR built natively on Sentinel and Defender with data staying in their own Azure tenant
- UK and European organizations wanting a UK-headquartered, CREST-accredited MDR provider with Microsoft MSSP of the Year credentials
- SMBs needing affordable 24/7 MDR via Clarity Defend, with a growth path to enterprise-grade Protect tier
Not ideal for
- Organizations running CrowdStrike, SentinelOne, or any non-Microsoft primary EDR. Quorum Cyber is Microsoft-only.
- Teams needing validated detection metrics, response SLAs, or extensive peer reviews before buying. None of these are published.
- Multi-cloud-heavy environments needing AWS/GCP coverage at a reasonable tier. Only Clarity Protect (top tier) covers non-Azure clouds.
Coverage
Endpoint
Cloud
Identity
SaaS
Network
OT / IoT
Platform
Additional Capabilities
Incident Response
Published SLA page exists (quorumcyber.
Detection Quality
Threat Hunting
Pricing
Not published. Described as 'flexible subscription model' with pricing based on environment size and risk profile.. Annual contracts.
Pricing compiled from public sources. Verify directly with the provider.
The Team
Reputation
Named in the Gartner Market Guide for MDR as Representative Vendor (2024, 2025). Microsoft Security MSSP of the Year 2025. First UK Microsoft Verified MXDR provider. Very limited independent review data: no ratings on G2, PeerSpot, or Gartner Peer Insights with sufficient reviews. Zero Reddit presence.
What customers praise
- Deep Microsoft security expertise. First UK company to achieve Microsoft Verified MXDR status, MSSP of the Year 2025.
- Three-tier model (Defend, Extend, Protect) offers genuine MDR starting at SMB level, not just enterprise
- Data stays in customer's own Azure tenant with no vendor lock-in on underlying data
Common complaints
- Microsoft-only. Not suitable for organizations running CrowdStrike, SentinelOne, or non-Microsoft primary security tools
- Low SOC analyst pay (~GBP 25,000 starting per Glassdoor) raises questions about staff retention and service quality
- Zero independent review presence on G2, PeerSpot, Reddit. Buyers cannot find peer validation before purchasing
Reddit (r/sysadmin, r/msp)
No discussion found on r/msp, r/cybersecurity, or r/sysadmin. Zero grassroots presence.
What to Ask Quorum Cyber (6 questions)▼
- 1.
What specific Microsoft licensing (E3, E5, standalone Defender P2) is the minimum prerequisite, and what is the total cost including Microsoft licenses plus your MDR fee?
- 2.
What response actions can your SOC take autonomously at 3am vs. what requires our approval? The approval model is not published.
- 3.
What are your published MTTD and MTTR commitments? We could not find any detection or response time metrics.
- 4.
What third-party technologies can Clarity Extend actually ingest via Sentinel connectors? No specific vendor list is published.
- 5.
Glassdoor reviews cite low analyst pay and retention concerns. What is your current SOC analyst retention rate and average tenure?
- 6.
Can you provide three customer references in our industry? Independent reviews on G2, PeerSpot, and Gartner Peer Insights are insufficient for evaluation.
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Information compiled from public sources. Verify details directly with the provider before making decisions.