Best SIEM Software · 2026
Graylog Security vs 
Microsoft Sentinel Graylog Security vs Microsoft Sentinel: on our data-weighted scoring, Graylog Security edges ahead (8.1 vs 8.1/10). Graylog Security starts at $18000/yr (Security, 10 GB/day) and is best for teams wanting siem-grade threat detection without splunk-level cost or complexity; Microsoft Sentinel starts at $4.3/GB ingested (PAYG, East US) and is best for microsoft-centric orgs wanting a cloud-native siem with deep entra/defender integration. Choose Graylog Security for the stronger overall track record; consider Microsoft Sentinel if its pricing model or fit matches your environment better. Side-by-side table below.
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Six criteria, each scored 0–10 on the same scale from real review data, public pricing and feature coverage. See our methodology →
| Criterion | Graylog Security | Microsoft Sentinel |
|---|---|---|
| Editorial | 8.1 | 8.1 |
| User reviews | 8.8 | 8.8 |
| Adoption | 5.5 | 6.5 |
| Affordability | 9.5 | 7.0 |
| Feature breadth | 6.0 | 6.0 |
| Ease of trial | 10.0 | 6.0 |
| Graylog Security | Microsoft Sentinel | |
|---|---|---|
| Starting price | $18000/yr (Security, 10 GB/day) | $4.3/GB ingested (PAYG, East US) |
| Pricing model | per gb | per gb |
| Free trial / tier | Free tier + 14 days | 31 days |
| Best for | Teams wanting SIEM-grade threat detection without Splunk-level cost or complexity | Microsoft-centric orgs wanting a cloud-native SIEM with deep Entra/Defender integration |
| Deployment | Cloud + self-host | Cloud |
| G2 rating | 4.4/5 (116) | 4.4/5 (289) |
| Capterra rating | — | — |
| Our score | 8.1 | 8.1 |
You need teams wanting siem-grade threat detection without splunk-level cost or complexity.
You need microsoft-centric orgs wanting a cloud-native siem with deep entra/defender integration.
Microsoft Sentinel bills on a per gb model from $4.3/GB ingested (PAYG, East US) (31 days trial), while Graylog Security uses a per gb model from $18000/yr (Security, 10 GB/day) (free tier available). Because the models differ, the cheaper option flips depending on your fleet size — model both at your seat/endpoint count.
Microsoft Sentinel ships 6 headline capabilities (Cloud-native SIEM + SOAR, Native Entra ID + Defender + M365 connectors, KQL hunting + analytics rules, UEBA + ML anomaly detection) and deploys Cloud. Graylog Security ships 6 (Free open-source tier, SIEM with MITRE ATT&CK mapping, Sigma rules + UEBA + risk scoring, Pipeline-based enrichment), deploying Cloud + self-host.
Microsoft Sentinel holds 4.4/5 (~289 G2 reviews); Graylog Security holds 4.4/5 (~116 G2 reviews). On our data-weighted score, Microsoft Sentinel edges ahead (8.1 vs 8.1/10). Pick Graylog Security instead when teams wanting siem-grade threat detection without splunk-level cost or complexity. See Microsoft Sentinel alternatives or Graylog Security alternatives.