An MDR provider finds threats in your environment, investigates them, and takes action. A SOCaaS provider does that too, but also manages your SIEM, handles compliance reporting, runs vulnerability scans, and covers broader security operations. The trade-off is scope versus cost.
Side-by-side comparison
| Dimension | MDR | SOCaaS |
|---|---|---|
| Core function | Detect & respond to threats | Full security operations |
| Scope | Threat detection, investigation, response | Detection + compliance + log management + vuln mgmt |
| Log management | Not included (you manage SIEM) | Included (they operate SIEM) |
| Compliance | Rarely included | Often included (reporting, audit support) |
| Vulnerability mgmt | Not included | Sometimes included |
| Internal team needed | Yes, for non-DR security work | Minimal, they handle most operations |
| Price | $8–35/ep/mo | $15–50+/ep/mo |
Which one fits
The deciding factor is how much of your security operation you want to outsource.
MDR is enough when...
You have an internal team or IT function that handles security operations and just need 24/7 threat detection and response. You already manage your own SIEM, log retention, and compliance reporting.
SOCaaS makes sense when...
You have no internal security team and want a single vendor to handle the entire security operation: detection, response, log management, compliance, and vulnerability management.
The overlap problem
The lines between MDR and SOCaaS are blurring. Many MDR providers are expanding scope, adding compliance dashboards, log management features, and vulnerability scanning. Some SOCaaS providers are rebranding as MDR because it's a hotter market term.
When evaluating, ignore the label. Ask: “What is included in the base contract?” and “What costs extra?” This gives you the real scope regardless of what they call themselves.
A newer category, AI SOC, adds further confusion. These vendors use AI to automate triage and investigation, sometimes positioning as SOCaaS without human-led operations. If you're evaluating one, ask what percentage of findings are reviewed by a human analyst before reaching you.
A practical path
Most organizations start with MDR. Detection and response is the hardest security function to build internally. It requires 24/7 staffing, specialized skills, and constant tuning. Once you have MDR in place, you can add compliance tooling, SIEM management, and vulnerability scanning as needed. This incremental approach avoids overbuying.
FAQ
What is the difference between MDR and SOC-as-a-Service?
MDR focuses on detection and response. SOCaaS is a broader outsourced security operation that includes MDR plus log management, compliance, and vulnerability management.
Is SOCaaS more expensive than MDR?
Generally yes, but it includes more services. If you'd need those services separately anyway, SOCaaS can be more cost-effective.
Do I need MDR or SOCaaS?
If you have an internal team and just need detection/response help, MDR is sufficient. If you have no security team, SOCaaS makes more sense.