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It's a split decision.
Splunk suits teams that want security and observability across a broad machine-data platform, with managed cloud or self-hosted deployment and usage-based pricing. Graylog suits lean teams focused on log management and SIEM, especially if a free self-managed edition or customer-controlled deployment matters. Graylog publishes paid starting prices and entry points; Splunk’s core platform pricing is usage-based without a published price here. Compare expected ingest, retention, and deployment costs before choosing.
01Side by side
| Splunk | Graylog | |
|---|---|---|
| Pricing model | Usage-based; activity, ingest, or workload pricing | Annual subscriptions; paid editions start at $15,000/year |
| Free tier | Free Observability and Agent Observability editions | Graylog Open is permanently free, with no volume restrictions |
| Open source and licence | No open-source claim; licence terms not published | Free Open edition; licence terms not published |
| Self-hosting | On-prem, private cloud, hybrid, or air-gapped | Graylog Cloud, customer cloud, own racks, or air-gapped |
| API and SDKs | Native OpenTelemetry, SDKs, and agents | Runs on AI tooling you already have |
| Integrations | Splunkbase lists 2,000+ integrations and apps | Named integrations are not listed |
| Deployment model | Managed Cloud Platform or deployed Enterprise platform | Graylog Cloud or self-managed deployment |
| Limits and scaling | Machine-data platform designed for petabyte scale | Open has no volume restrictions; paid entry is 10 GB/day |
Splunk Choose Splunk if
- Choose Splunk if you need security and observability on one platform.
- Choose Splunk if you need native OpenTelemetry, SDKs, and agents.
- Choose Splunk if you need a managed cloud or air-gapped deployment.
Graylog Choose Graylog if
- Choose Graylog if you want a permanently free, self-managed log platform.
- Choose Graylog if you need published SIEM starting prices and entry points.
- Choose Graylog if you need customer-cloud, own-rack, or air-gapped deployment.
02Pricing at real usage
Graylog Open is permanently free, with no volume restrictions, and includes community support, search, dashboards, and data routing. Graylog Enterprise starts at $15,000 per year, with a 10 GB/day or 100 GCU entry point. Graylog Security starts at $18,000 per year at the same entry point. Both subscriptions are annual; the listed monthly equivalents are $1,250 and $1,500, respectively.
Splunk Cloud Platform and Splunk Enterprise use activity-based, ingest, or workload pricing, but the pricing page does not publish their prices. For observability, listed annual-billing equivalents include $15 per host per month for Infrastructure, $60 for App & Infra, and $75 for End-to-End. Ask Splunk for a quote based on expected usage; ask Graylog how costs change above its paid entry point. These prices do not establish equivalent feature sets.
03API, SDKs and integration
Splunk’s homepage cites native OpenTelemetry support, SDKs, and agents. Splunkbase lists more than 2,000 integrations and apps, which gives teams a broad catalog to check against their existing stack. The homepage does not identify SDK languages, API protocols, or CLI commands, so confirm those details in the documentation for the products you plan to integrate.
Graylog says it runs on AI tooling you already have, but its homepage does not name specific integrations, SDK languages, API styles, or CLI commands. Neither homepage identifies a specific protocol or language-level integration path. For either platform, verify how your log shippers and telemetry sources connect, what authentication they require, and whether your chosen deployment supports the integration. The available facts do not establish equivalent API coverage or migration tooling.
04Open source, self-hosting and lock-in
Both products support self-hosting. Splunk Enterprise can run on-premises, in a private cloud, in a hybrid setup, or in an air-gapped environment. Graylog offers Graylog Cloud or deployment in your cloud or on your own racks, including air-gapped environments.
Graylog Open is free, but the vendor does not describe its licence as open source in the product details. Splunk’s open-source status and licence are also not stated by the vendor. Neither vendor’s homepage explains data-export formats or a migration path. Before committing, ask how to export raw events, saved searches, dashboards, detection rules, and incident history, and whether those exports can be imported elsewhere. Moving platforms can mean rebuilding integrations and operational content; the effort will depend on what your team has configured.
Questions people ask
What are the key differences between Splunk and Grafana?
Splunk is a machine-data platform for security, observability, and AI. Grafana is not the comparison here, so check its current product and pricing pages against your needs. Splunk’s listed features include federated search, threat detection, and full-stack observability; this comparison does not establish Grafana’s feature set.
What are some alternatives to Graylog?
Splunk is one alternative if you need a broader platform spanning security and observability, plus managed cloud or self-hosted deployment. Graylog is more directly positioned around log management and SIEM, with a free self-managed edition. Compare ingestion, retention, integrations, and deployment requirements before evaluating either.
Is Splunk a type of SIEM?
Splunk offers SIEM capabilities through Enterprise Security, which includes AI, threat intelligence, and Detection Studio in Essentials. The Premier edition adds SOAR, UEBA, and Automated Threat Analysis. Splunk also sells broader data, security, and observability products, so SIEM is one part of its platform.
What logs can be sent to the Splunk platform?
Splunk describes its platform as unifying machine data and cites native OpenTelemetry support, SDKs, and agents. Its homepage does not enumerate specific log formats or sources. Check the documentation for your planned inputs and deployment, and confirm whether the relevant integration is available through Splunkbase.