We may earn a commission if you buy through links on this page. It never changes a score or a ranking. How we make money
Most buyers should pick Graylog.
Choose Graylog for a lower-cost, more legible entry: its source-available Open edition is free, and paid Enterprise starts at $15,000/year (from 10 GB/day or 100 GCUs). Choose Splunk when you need its wider security, observability, and AI platform, including federated search and AI-agent observability. Splunk’s core Cloud and Enterprise prices are usage-based and not published, so its published $6 starting point—AppDynamics Infrastructure per vCPU/month—is not a like-for-like core-platform price.
01Side by side
| Splunk | Graylog | |
|---|---|---|
| Starting price | $6/vCPU/month for AppDynamics Infrastructure; core prices not published | Free Open; paid Enterprise from $1,250/month, billed annually |
| Free plan | Free editions for Observability Cloud and Agent Observability | Graylog Open: free, with no volume restrictions |
| Best for | Security, observability, and AI across machine data | SIEM and log management for security and operations |
| Core strength | Federated search and full-stack observability | Centralized logging, detection rules, and risk-scored incidents |
| Learning curve | Review ease-of-use score: 5 | Review ease-of-use score: 6 |
| Integrations/data | Search telemetry where it lives across tiers | Supports Syslog, CEF, GELF, Beats, Netflow, and more |
| Team/seat costs | Unlimited users on Cloud and Enterprise plans | No device-count or user-count licensing fees |
| Support | Review support score: 5 | Community support on Open; review support score: 6 |
Splunk Choose Splunk if
- Choose Splunk if you need security, observability, and AI in one platform.
- Choose Splunk if federated search across telemetry tiers matters.
- Choose Splunk if you need unlimited users on Cloud or Enterprise.
Graylog Choose Graylog if
- Choose Graylog if you want a free, self-managed log platform.
- Choose Graylog if you need published starting prices for paid plans.
- Choose Graylog if you want SIEM detection rules mapped to MITRE ATT&CK.
02Pricing compared
Graylog is easier to price from the public figures. Graylog Open is free, with no volume restrictions, but your team maintains it and support is community-based. Graylog Enterprise starts at $15,000/year, from 10 GB/day or 100 GCUs; Graylog Security starts at $18,000/year with the same stated minimum. The pricing page gives monthly equivalents of $1,250 and $1,500, but says paid licenses are annual subscriptions and does not publish monthly billing prices.
Splunk Cloud Platform and Splunk Enterprise use usage-based pricing, with core prices not published. Splunk’s published $6 starting point is AppDynamics Infrastructure per vCPU/month, not a comparable price for Splunk’s core platform. Splunk’s Observability Cloud Infrastructure is listed at $15 per host/month, billed annually. Those are separate product prices, not a simple Splunk-versus-Graylog license comparison.
03Features and depth
Splunk covers more than log management and SIEM. Its platform combines machine-data search and analysis with threat detection, full-stack observability, federated search across tiered data, and monitoring for AI agents and their infrastructure. The pricing page also lists AI cost visibility for LLM token usage among its capabilities. Splunk Enterprise Security Essentials includes SIEM and threat intelligence; Premier adds SOAR, UEBA, and Automated Threat Analysis.
Graylog is more focused on security and operations logging. Graylog Open includes search, dashboards, pipelines, and data routing, with support for inputs such as Syslog, CEF, GELF, Beats, and Netflow. Enterprise adds data lake routing and tiering, SSO, and user audit logs. Graylog Security adds anomaly detection and maintained rules mapped to MITRE ATT&CK. Its described capabilities also include risk-scored incidents and AI-assisted investigations. The choice is breadth versus a more concentrated log-management and SIEM toolset; the published details do not establish that either product handles every workload better.
04Ease of use and learning curve
The published material does not establish which interface is easier to learn, so we would not treat either product as the easy option by default. The clearest difference is how much you manage. Graylog Open is self-managed, and its pricing page says teams using it need to maintain their own log management. It includes community support; paid plans add features such as SSO and user audit logs.
Splunk offers Cloud Platform for managed cloud analytics and Enterprise for on-premises, private-cloud, or air-gapped deployments. Both list unlimited users, but pricing is usage-based and not published. Graylog’s free edition may lower the cost of evaluating it, while Splunk’s free observability edition is limited to that product area. Factor in deployment ownership, support, and usage costs—not just the apparent learning curve.
Questions people ask
Is Splunk a type of SIEM?
Splunk is broader than a SIEM: its platform also covers machine-data search, observability, and AI. Its Enterprise Security Essentials plan includes SIEM and threat intelligence, while Premier adds SOAR, UEBA, and Automated Threat Analysis. So SIEM is part of Splunk’s security offering, not the whole platform.
Can I use Graylog for free?
Yes. Graylog Open is a free, source-available edition under SSPL, with no volume restrictions and features including search, dashboards, pipelines, and data routing. The pricing page says it is self-managed and includes community support, rather than paid-plan support.
What logs can be sent to the Splunk platform?
The published Splunk product details do not list supported log formats or specific sources, so we can’t give a reliable format-by-format answer from this information. Graylog’s pricing page does name Syslog, CEF, GELF, Beats, and Netflow among its supported inputs.
Are Splunk and Graylog prices directly comparable?
Not cleanly. Graylog publishes annual starting prices for Enterprise and Security, while Splunk Cloud Platform and Splunk Enterprise are usage-based with prices not published. Splunk’s listed $6 price is for AppDynamics Infrastructure per vCPU/month, not its core platform.