Best SIEM Software (2026)

6 siem tools ranked on real review data, live pricing and feature coverage — refreshed automatically.

6 tools compared Data-driven, never pay-to-play Sourced pricing & ratings

Our verdict

The best siem software in 2026 is Wazuh — best for teams wanting a free, open-source siem/xdr they can self-host (or run as managed cloud). It scores 8.3/10 on our data-weighted ranking (4.5/5 (~59 G2 reviews)) and starts at $571/mo (Cloud, up to 100 agents). Blumira is the strongest runner-up. Full comparison table and per-tool breakdown below — all figures stamped with a data-as-of date and linked sources.

6 products

  1. 1Wazuh

    ★ Editor's Choice 8.3 4.5 (59) Free tier

    Best for Teams wanting a free, open-source SIEM/XDR they can self-host (or run as managed cloud).

    • Open-source SIEM + XDR
    • Log analysis + file integrity monitoring
    • Vulnerability detection
    • Regulatory compliance (PCI

    Overview · Pricing · Review · Alternatives

    Visit Wazuh → From $571/mo (Cloud, up to 100 agents)

  2. 2Blumira

    8.1 4.6 (120) Free tier

    Best for Lean IT teams wanting easy SIEM + detection with a free tier.

    • Cloud SIEM
    • Automated detections + playbooks
    • 24/7 SecOps support
    • Honeypots

    Overview · Pricing · Review · Alternatives

    Visit Blumira → From Free tier available

  3. 3Microsoft Sentinel

    8.1 4.4 (289)

    Best for Microsoft-centric orgs wanting a cloud-native SIEM with deep Entra/Defender integration.

    • Cloud-native SIEM + SOAR
    • Native Entra ID + Defender + M365 connectors
    • KQL hunting + analytics rules
    • UEBA + ML anomaly detection

    Overview · Pricing · Review · Alternatives

    Visit Microsoft Sentinel → From $4.3/GB ingested (PAYG, East US)

  4. 4Splunk Enterprise Security

    8.1 4.3 (222)

    Best for Large enterprises needing deep, mature SIEM with extensive integrations and log analytics.

    • Industry-leading SPL search + analytics
    • Risk-based alerting + correlation
    • 2
    • 800+ integrations

    Overview · Pricing · Review · Alternatives

    Visit Splunk Enterprise Security → From Custom quote

  5. 5Graylog Security

    8.1 4.4 (116) Free tier

    Best for Teams wanting SIEM-grade threat detection without Splunk-level cost or complexity.

    • Free open-source tier
    • SIEM with MITRE ATT&CK mapping
    • Sigma rules + UEBA + risk scoring
    • Pipeline-based enrichment

    Overview · Pricing · Review · Alternatives

    Visit Graylog Security → From $18000/yr (Security, 10 GB/day)

  6. 6Sumo Logic

    8.1 4.3 (338) Free tier

    Best for Cloud-native teams wanting log analytics + Cloud SIEM with a credit-based consumption model.

    • Cloud-native log analytics
    • Cloud SIEM + Cloud SOAR
    • Credit-based flexible consumption
    • Real-time dashboards + alerting

    Overview · Pricing · Review · Alternatives

    Visit Sumo Logic → From Free tier available

Affiliate links — vendors may pay us a commission. Ranking is data-driven and never pay-to-play. How we rank →

How to choose

When choosing siem software, weigh four things against your environment: pricing model (per-endpoint vs per-technician vs per-user — it changes total cost dramatically at scale), deployment and integration fit with your existing stack, breadth of automation, and independent review scores. The table above ranks every tracked option on the data we hold; use the per-tool notes to match capabilities to your use case.

Budgeting the whole stack? Use our MSP software cost calculator to estimate monthly and annual spend for siem alongside the rest of your tools, using real published pricing.

Buyer's guide

How we ranked the best siem software

We score every tool on a transparent 0–10 scale weighted from third-party review data (G2/Capterra, adjusted for review volume), published pricing, and verified feature breadth — never opinion alone. All figures were last checked June 2026 and every row links its source.

Pricing models in siem software

Across the 6 tracked tools, billing runs on per agent, per user, per gb, quote models — which changes total cost dramatically at scale, so compare on your endpoint or technician count, not headline price. Microsoft Sentinel carries the lowest published entry price at $4.3/GB ingested (PAYG, East US). Wazuh, Blumira, Graylog Security offer a genuinely free tier; several others run free trials.

Who each is for

  • Wazuh — Teams wanting a free, open-source SIEM/XDR they can self-host (or run as managed cloud). 8.3/10, from $571/mo (Cloud, up to 100 agents) (4.5/5 (~59 G2 reviews)).
  • Blumira — Lean IT teams wanting easy SIEM + detection with a free tier. 8.1/10, from Free tier available (4.6/5 (~120 G2 reviews)).
  • Microsoft Sentinel — Microsoft-centric orgs wanting a cloud-native SIEM with deep Entra/Defender integration. 8.1/10, from $4.3/GB ingested (PAYG, East US) (4.4/5 (~289 G2 reviews)).
  • Splunk Enterprise Security — Large enterprises needing deep, mature SIEM with extensive integrations and log analytics. 8.1/10, from Custom quote (4.3/5 (~222 G2 reviews)).
  • Graylog Security — Teams wanting SIEM-grade threat detection without Splunk-level cost or complexity. 8.1/10, from $18000/yr (Security, 10 GB/day) (4.4/5 (~116 G2 reviews)).
  • Sumo Logic — Cloud-native teams wanting log analytics + Cloud SIEM with a credit-based consumption model. 8.1/10, from Free tier available (4.3/5 (~338 G2 reviews)).

Our pick

On the data we hold, Wazuh leads at 8.3/10. The open-source SIEM/XDR of choice — free to license and genuinely capable, if you can invest the engineering to run it. Read the full Wazuh review or compare it head-to-head below.

Frequently asked questions

What is the best siem software in 2026?
Wazuh ranks first in our data-weighted comparison (8.3/10, 4.5/5 (~59 G2 reviews)), starting at $571/mo (Cloud, up to 100 agents).
What is the cheapest siem software?
Among tracked options, Microsoft Sentinel has the lowest published starting price at $4.3/GB ingested (PAYG, East US). Pricing models differ, so compare per-endpoint vs per-technician costs for your fleet size.
Is there a free siem software option?
Wazuh offers a free tier. Several others provide free trials — see the pricing column in the table above.
Data as of June 16, 2026. Sources: wazuh.com, blumira.com, azure.microsoft.com, splunk.com, graylog.org, sumologic.com. Figures are pulled from public vendor and security data and refreshed automatically.