| CYBER DEFENSE SYSTEM |  Sophos Fusion
Sophos Fusion sees everything, connects everything, and enables your defenses to respond as one. It’s the industry’s most complete cyber defense system, engineered for a world where threats move at AI speed. |  No native security controls
ReliaQuest connects to existing SIEM, EDR, firewall, cloud, and other tools, but does not provide comparable first-party security controls. |
| MDR SERVICE LEVEL | Fully managed MDR service Sophos MDR delivers human-led investigation, proactive threat hunting, and hands-on-keyboard response from a global team of analysts, threat hunters, researchers, and incident responders. | Not a fully managed MDR service ReliaQuest is positioned as a platform for customer-owned tools and SIEM environments, leaving threat hunting, response, and oversight largely with the customer or partner. |
| COMPLETE MANAGED RESPONSE | Response from containment through remediation Sophos MDR takes direct action on customers’ behalf. It provides end-to-end response ownership across native controls and a growing range of third-party integrations. | Customer-managed response ownership ReliaQuest supports response through automation, playbooks, and API-driven workflows, but customers or partners remain responsible for executing, validating, and overseeing remediation. |
| CRITICAL INCIDENT MANAGEMENT | Included with MDR Plus Sophos MDR Plus provides critical incident management, including root-cause analysis, removal of attacker tools and persistence mechanisms, and recovery guidance. | Separate paid engagement ReliaQuest incident response is sold separately rather than included as part of a fully managed MDR service. |
| ENDPOINT PROTECTION INCLUDED | Endpoint protection and XDR included Sophos Endpoint and XDR are included with Sophos MDR, providing integrated prevention, detection, investigation, and response capabilities. | No native endpoint protection or EDR ReliaQuest does not offer a first-party endpoint protection or EDR; customers must bring their own endpoint and other security controls. |
| THREAT INTELLIGENCE | Compounding intelligence at global scale Every threat across 625,000+ customers, MDR resolved edge case, and onboarded environment feeds Sophos AI models, detections, and response playbooks—so every customer benefits from shared intelligence. | Limited proprietary threat intelligence ReliaQuest relies more heavily on open-source intelligence, third-party telemetry, and customer-provided data, while Sophos benefits from proprietary X-Ops, Secureworks CTU research, and global customer telemetry. |
| THIRD-PARTY INTEGRATIONS | Telemetry ingestion included natively at no extra cost Sophos XDR and MDR support 500+ third-party integrations at no extra cost. Both do not require a SIEM to ingest data from third-party sources. | Some sources require SIEM, adding cost ReliaQuest can ingest data directly from some sources at no additional cost; for others, it requires a SIEM, adding complexity and potential cost. |
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