Decision guide
SIEM vs Managed SIEM vs MDR
| SIEM | Managed SIEM | MDR | |
|---|---|---|---|
| What it is | Software for collecting logs, correlating events, and supporting investigations. | A service that manages, hosts, tunes, or monitors a SIEM environment. | A service that investigates and responds to threats, often using SIEM, EDR, identity, cloud, and network data. |
| Who operates it | Usually the buyer’s security or IT team. | Shared between the provider and buyer, or mostly provider-operated. | Provider analysts own more of the investigation and response workflow. |
| Main buyer problem | Need centralized logging, correlation, retention, and visibility. | Have logs and alerts but lack time or expertise to tune and operate SIEM well. | Need 24/7 investigation and response capacity, not only a place to store alerts. |
| Main caution | A SIEM alone does not provide analysts or response. | Managed SIEM may still leave containment and incident response with the buyer. | MDR may not replace compliance log retention or full SIEM ownership. |
Buyer takeaways
- Start with the work you need done, not the acronym.
- If alert investigation is the bottleneck, MDR may be more relevant than managed SIEM.
- If log retention, data cost, and detection tuning are the bottleneck, managed SIEM may be the better starting point.