SIEM vs SOAR: Differences, Table & Which You Need
TL;DR · the short version
SIEM and SOAR solve different halves of security operations. A SIEM (Security Information and Event Management) centralises logs and telemetry, correlates them, and raises alerts — it is how you detect. A SOAR (Security Orchestration, Automation and Response) takes those alerts and runs playbooks across your tools to triage and respond — it is how you act. They are complementary, not competing: most mature SOCs run both, often from one vendor or a converged platform. Splunk, for example, is a SIEM (Splunk Enterprise Security) with a separate SOAR product. This guide explains each in plain terms, the real differences, when you need each, and how they fit with XDR and MDR.
SIEM vs SOAR: what is the difference?
A SIEM centralizes logs and is the detection side; a SOAR automates the response side. NIST's glossary, citing SP 800-92, defines SIEM as a program that provides centralized logging capabilities for a variety of log types. NIST SP 800-215 describes SOAR as a strategy that has evolved to automate the incident response process, which a security operations center otherwise carries out by hand when it handles alerts and threat intelligence feeds.
What is SOAR in cyber security, and how does it relate to a SIEM?
SOAR stands for security orchestration, automation, and response. NIST SP 800-61 Rev. 3 treats the two as complementary examples of tooling: it names SIEM and SOAR as tools to continuously monitor log events for known malicious and suspicious activity, and as event correlation technology that gathers related data captured by multiple sources. It also cites them, with manual means, for estimating the impact and scope of adverse events. NIST does not say you need one before the other; that depends on your log sources, alert volume and how repeatable your response steps are.
Sources checked on 3 November 2026: NIST glossary: SIEM (from SP 800-92) NIST SP 800-215, section 3.4.1 NIST SP 800-61 Rev. 3, DE.AE-02 to DE.AE-04.
SIEM and SOAR get bundled together and even confused, but they do different jobs. A SIEM detects — it is how your security team sees what is happening. A SOAR responds — it is how your team acts on what the SIEM finds, with less manual effort. You usually need both, at different points in a SOC’s growth. (For the operating model around both tools, see our security operations center best practices checklist.) Here is the real difference, in plain terms.
What a SIEM actually does
A Security Information and Event Management platform centralises logs and telemetry from across your estate — endpoints, servers, network devices, identity providers, cloud and SaaS — then normalises, stores and correlates them. On top of that data it runs detection rules and analytics to raise alerts when something matches a known-bad pattern or deviates from normal. Its core value is visibility and detection: one place to search, retain and alert on security-relevant events. Writing good detection rules — high recall without drowning analysts in false positives — is the central SIEM skill.
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What a SOAR actually does
A Security Orchestration, Automation and Response platform sits downstream of detection. It takes alerts (frequently from the SIEM) and runs playbooks across your other tools: enrich an indicator against threat intelligence, pull host details from EDR, open or update a ticket, notify an analyst, and — with the right guardrails — take containment actions like isolating a host or disabling an account. Its core value is orchestration and automation: cutting the manual, repetitive steps between an alert firing and an incident being handled.
SIEM vs SOAR side by side
| Dimension | SIEM | SOAR |
|---|---|---|
| Job | Detect and analyse | Orchestrate and respond |
| Input → output | Raw logs and telemetry → alerts | Alerts → automated or semi-automated actions |
| Core features | Log collection, normalisation, retention, search, correlation and detection rules | Playbooks, integrations with your other tools, case management, human approval steps |
| Primary benefit | Visibility: one place to search, retain and alert on security events | Time back: less manual, repetitive triage and response work |
| Measured by | Detection coverage and alert quality | Mean time to respond and the share of steps automated |
| When you need it | First: you cannot respond to what you cannot see, and centralised logging is often a compliance requirement | Later: once alert volume and repeatable response steps make automation pay off |
| Splunk example | Splunk Enterprise Security | Splunk SOAR (formerly Phantom), a separate product |
In one line: a SIEM turns raw logs into alerts, and a SOAR turns alerts into actions.
When you need each
Lead with a SIEM: you cannot respond to what you cannot see, and centralised logging is often a compliance requirement in its own right. Add SOAR once you have enough alert volume and repeatable response steps that automation clearly pays off — if your team is small and alert volume is low, tuning the SIEM and your detection rules usually returns more than bolting on orchestration. Increasingly the practical choice is a converged platform that provides both rather than two separately integrated products.
Where Splunk, XDR and MDR fit
Splunk is a common source of the "is it a SIEM or SOAR?" confusion: Splunk Enterprise Security is the SIEM and Splunk SOAR is the separate automation product — many vendors sell both. XDR (Extended Detection and Response) is a vendor-integrated stack that correlates across endpoint, identity, email and cloud out of the box, usually within one ecosystem; SOAR is tool-agnostic automation across whatever you already own. MDR (Managed Detection and Response) is a service — a provider operating detection and response for you, often on top of a SIEM and SOAR you never see.
How they work together
In a mature SOC the SIEM is the analyst’s detection surface and the SOAR removes the manual toil around triage and response, while humans stay in the loop for judgement and for any irreversible action. Practise the detection half in the free Detection Lab →, pressure-test your response sequencing in the IR Playbook Lab, work a realistic queue in the SOC Case Triage Lab, and gauge where your operations sit with the SOC maturity assessment.
Frequently asked questions
SIEM vs SOAR in one line? SIEM detects (logs → alerts); SOAR responds (alerts → automated actions).
Do I need both? Start with SIEM; add SOAR when alert volume and repeatable steps make automation worth it — often now from one platform.
Is Splunk a SIEM or SOAR? Both, as separate products (Enterprise Security + Splunk SOAR).
SOAR vs XDR? XDR = vendor-integrated cross-telemetry detection/response; SOAR = tool-agnostic automation across your existing stack.
Frequently asked questions
What is the difference between SIEM and SOAR?
A SIEM detects: it collects logs and telemetry from across your environment, normalises and correlates them, and raises alerts when activity matches a detection rule or looks anomalous. A SOAR responds: it takes alerts (often from the SIEM) and runs automated or semi-automated playbooks across your other tools — enriching an indicator, opening a ticket, isolating a host, disabling an account — so analysts spend less time on manual, repetitive steps. In short, SIEM is detection and analytics; SOAR is orchestration and response. They operate on the same incidents at different stages.
Do I need both SIEM and SOAR?
Most organisations start with a SIEM, because you cannot respond to what you cannot see — detection and log retention usually come first, and many compliance regimes effectively require centralised logging. SOAR adds the most value once you have enough alert volume and repeatable response steps that automation pays off; a small team with low alert volume may get more from tuning the SIEM than from adding SOAR. Many teams now get both capabilities from a single platform rather than two separate products.
Is Splunk a SIEM or a SOAR?
Both, as separate products. Splunk Enterprise Security is the SIEM; Splunk SOAR (formerly Phantom) is the orchestration-and-automation product. They integrate, but they are distinct tools you can buy independently. This is common across the market — several vendors sell a SIEM and a SOAR that work together, which is part of why the terms get confused.
How is SOAR different from XDR?
XDR (Extended Detection and Response) is a vendor-integrated detection-and-response stack that correlates across endpoint, identity, email and cloud out of the box, usually within one vendor ecosystem. SOAR is tool-agnostic orchestration that automates workflows across whatever products you already own, including third-party ones. XDR leans toward built-in correlation and response for its own telemetry; SOAR leans toward cross-tool automation and custom playbooks. Some platforms blur the line by bundling SOAR-like automation into XDR.
What is the relationship between SIEM, SOAR and a SOC?
The SOC (Security Operations Centre) is the team and process; SIEM and SOAR are tooling the SOC uses. The SIEM is typically the analyst’s primary detection surface, and the SOAR reduces the manual toil of triage and response. A SOC can exist with only a SIEM (and manual response), but adding SOAR is one of the common steps as a SOC matures from reactive to repeatable.
Does SOAR replace analysts?
No. SOAR automates the repetitive, deterministic parts of response — enrichment, lookups, ticketing, containment steps with clear criteria — so analysts focus on judgement: scoping an incident, deciding whether an action is safe, and investigating the ambiguous cases automation cannot resolve. A playbook that acts without a human gate on an irreversible step (like mass account disablement) is a risk, not a win; good SOAR keeps humans in the loop where it matters.