Splunk vs Elastic: Costs, SIEM & Verdict (2026)

TL;DR

• Splunk is proprietary, built on its own indexer and SPL, priced by ingest, workload, or entity (host) — Splunk Observability Cloud starts at $15 per host per month. It is now owned by Cisco (deal closed 18 March 2024, ~$28 billion).
• Elastic is the open-source Elastic Stack (Elasticsearch, Kibana, Beats/Agent). Self-hosting is free; Elastic Cloud is resource-based. Elastic announced Elasticsearch's return to open source under AGPL on 29 August 2024.
• Pick Splunk if you want turnkey SIEM and support and can fund the license. Pick Elastic if you have engineers and want to control cost.
• Both run SIEM (Splunk Enterprise Security vs Elastic Security) and observability (Splunk Observability Cloud vs Elastic Observability).

Splunk is a proprietary platform built on its own indexer and the SPL query language, sold on ingest, workload, or entity pricing. Elastic is the open-source Elastic Stack — Elasticsearch, Kibana, Beats — under AGPL, free to self-host and priced on resources in Elastic Cloud. Splunk is turnkey; Elastic is cheaper to run but needs engineering.

Most pages ranking for this query are published by a company that sells a competing tool — the two vendors themselves, or a third observability/SIEM vendor. Everything below comes from the vendors' own pages and filings, dated.

What is the difference between Splunk and Elastic?

Architecture is the core split. Splunk ingests, parses, and indexes data into its own proprietary index, and you query it with SPL (Search Processing Language) or SPL2. One vendor, one language, one stack.

Elastic is modular and open source: Elasticsearch (the Lucene-based search and storage engine), Kibana (visualization), and Beats, Logstash, or the unified Elastic Agent for collection. You query with Query DSL, ES|QL, or KQL.

The practical trade: Splunk ships as a managed, turnkey product. Elastic gives you more control and lower licensing cost, but you assemble and operate more of the stack yourself. The current major release is Elastic Stack 9.x.

Who owns Splunk now, and does it matter?

Cisco owns Splunk. The acquisition closed on 18 March 2024 for approximately $28 billion in equity value, at $157 per share in cash.

For buyers, the near-term effect is integration with Cisco's security portfolio, not a product teardown. Splunk Enterprise Security and Splunk Observability Cloud remain the flagship products and are still sold under Splunk's own pricing models. Treat it as continuity with a larger parent behind it.

What happened with Elastic's license?

Elastic left open source in 2021, moving Elasticsearch and Kibana off Apache 2.0 to the source-available SSPL and Elastic License v2 after a dispute with AWS, which forked the code into OpenSearch.

On 29 August 2024, founder Shay Banon announced Elastic was adding the OSI-approved AGPL v3 as a license option alongside ELv2 and SSPL — making Elasticsearch open source again. Nothing was removed; AGPL was added. If open-source licensing is a procurement requirement, Elastic now qualifies and Splunk does not.

How do Splunk and Elastic pricing models differ?

They price on different axes. Splunk sells, per its pricing page, activity-based, ingest, workload, and entity pricing:

• Splunk Cloud Platform: activity-based, ingest, or workload pricing, unlimited users.
• Splunk Enterprise: data-ingest or workload pricing, unlimited users.
• Splunk Observability Cloud: host-based entity pricing from $15 per host per month (Infrastructure from $15, App & Infra from $60, End-to-End from $75, each per host/month billed annually).

Elastic prices by deployment:

• Self-managed: license-based, tied to nodes and RAM — and the Basic tier is free and open.
• Elastic Cloud (Hosted): resource-based, pay-as-you-go monthly or prepaid, across AWS, GCP, and Azure.
• Serverless: usage-based.

Elastic's paid subscription tiers are Basic (free), Platinum, and Enterprise.

Splunk vs Elastic: side-by-side

Splunk vs Elastic for SIEM

Both are credible SIEMs. Splunk Enterprise Security is the incumbent, and Splunk's own comparison cites a 2025 Gartner Magic Quadrant placing it a Leader and Elastic a Visionary, with deeper UEBA, SOAR, and third-party EDR coverage. Elastic Security is the lower-cost, open-source challenger that scales well on self-hosted infrastructure.

Note the bias: that Gartner reading comes from Splunk's own comparison page. If SIEM is your primary buy, shortlist both and weigh them against dedicated options in our top SIEM tools guide.

Splunk vs Elastic for observability and log analytics

For logs and observability, Elastic is strong and cost-efficient because the engine is free to self-host and log-heavy workloads get expensive fast on ingest-priced tools. Splunk Observability Cloud is OpenTelemetry-native with host-based pricing from $15/host/month, which is predictable for infrastructure-heavy estates.

If you are scoping observability more broadly, compare both against the field in our observability and APM roundup, and see how Splunk stacks up against Datadog in our Datadog vs Splunk comparison.

What this means for you

• Solo / small team: Start with Elastic self-managed (Basic is free) or Elastic Cloud. Splunk's licensing rarely fits small budgets.
• Large enterprise, SIEM-first: Splunk Enterprise Security — mature SOAR/UEBA, turnkey, Cisco behind it. Budget for the license.
• Cost-constrained, log-heavy: Elastic. Free engine, resource-based cloud pricing, no per-GB ingest penalty.
• Already on ELK: Stay on Elastic and adopt its paid tiers for support and security rather than re-platforming to Splunk.
• Open-source mandate: Elastic (AGPL). Splunk is proprietary.
• Minimal ops headcount: Splunk — you pay to not operate the stack.

Frequently Asked Questions

What is the difference between Splunk and Elastic?

Splunk is a proprietary platform with its own indexer and the SPL query language, sold on ingest, workload, or entity pricing. Elastic is the open-source Elastic Stack (Elasticsearch, Kibana, Beats) under AGPL, free to self-host. Splunk is turnkey; Elastic trades setup effort for lower licensing cost and more control.

Is Elastic cheaper than Splunk?

Usually, yes. Elastic's self-managed Basic tier is free and open, and Elastic Cloud is resource-based rather than priced per gigabyte ingested. Splunk's ingest and workload pricing climbs with data volume. Elastic shifts cost from license fees to the engineering time needed to run and scale the stack.

Can Elastic replace Splunk?

Often, yes. Elastic Security and Elastic Observability cover most SIEM, log analytics, and observability workloads that Splunk handles, at lower licensing cost. The gaps are maturity in advanced SOAR, UEBA, and prebuilt content, plus the operational burden of running Elastic yourself. Large SOCs should pilot before migrating.

Is Elasticsearch the same as Splunk?

No. Elasticsearch is the open-source search and storage engine inside the Elastic Stack, queried with Query DSL and built on Lucene. Splunk is a proprietary, integrated platform queried with SPL. Elasticsearch is one component; Splunk is a whole product. You pair Elasticsearch with Kibana and Beats to approximate Splunk's scope.

Is Splunk or Elastic better for SIEM?

Splunk Enterprise Security is the more mature SIEM, with deeper SOAR, UEBA, and EDR integrations. Elastic Security is the cheaper, open-source alternative that scales well on your own hardware. Choose Splunk for turnkey depth; choose Elastic for cost control and flexibility.

Editor's note — sources: Figures reflect the vendors' own pricing and announcement pages and Cisco's investor-relations release, verified 21 October 2026. Where a vendor's claim favours its own product (e.g. the Gartner placement), we attribute it to that vendor rather than asserting it. Cisco completed its acquisition of Splunk on 18 March 2024 (~$28B equity value, $157/share cash) per Cisco's investor-relations announcement. Elastic added AGPL v3 on 29 August 2024 per Elastic's "Elasticsearch is open source again" post. Splunk's pricing models and the $15/host/month Observability Cloud entry price are from Splunk's pricing page; the SIEM positioning and Gartner claim from Splunk's own Splunk-vs-Elastic comparison. Elastic's deployment-based, resource-based pricing and free Basic tier are from Elastic's pricing page.