Splunk Alternatives in 2026: Cheaper SIEM Options With Real Prices

Most teams that look for a Splunk alternative are not short of features. They are short of a bill they can predict.

Splunk prices by activity, ingest or workload, and its SIEM editions carry no published figure, so the first question is what the rivals actually publish.

Toolradar data: Splunk is the most compared security monitoring tool on Toolradar's security monitoring ranking, with 281 side-by-side comparisons in the 90 days to October 2026.

It is also listed as an alternative to 61 other tools, the highest count in that category.

This page is the leave-Splunk cost comparison. For the general ranking, read the best SIEM tools guide.

For a plain explanation of how SIEM billing works, read how much a SIEM costs.

Methodology: we read each vendor's own pricing page on 10 October 2026, recorded the plan names and billing basis shown there, and costed each volume-billed option at the same 10 GB a day, leaving per-source and quote-only prices as published. We did not run a hands-on test.

A Splunk alternative is a SIEM that collects logs from servers, endpoints, cloud accounts and identity providers, correlates them into alerts, and keeps a searchable record for investigations. The options here do that job, and differ mainly on how they bill.

Four billing bases appear among the priced options.

For the wider SOC stack around a SIEM, see the incident response guide and the EDR guide. Microsoft and Elastic bill on data moved.

Datadog bills on data analyzed. Graylog sells a daily volume licence. ManageEngine bills by log source. IBM and Google name a basis but sell through a quote.

Pick on the billing basis first, then on the number. A per-GB bill grows every time a new firewall or cloud audit trail is connected, while a per-source or per-licence bill stays flat until you add sources.

Retention is where the second bill hides.

Microsoft charges $0.026 per GB a month for data lake storage, and Elastic charges from $0.017 per GB retained a month. Google includes one year of telemetry retention. Datadog includes 12 months of analysis and retention in its Cloud SIEM price.

Graylog leaves the hot, warm and archive periods to the buyer. For the sensors that feed these platforms, see the network security monitoring guide.

Prices below were read on each vendor's own pricing page on 10 October 2026, in US dollars. Costs are at 10 GB a day, or 3,650 GB a year and 300 GB a month on a 30-day month. Each figure covers only the lines its card names, so Datadog's separate log ingest and the long-term storage at Elastic and Microsoft are left out.

Splunk's pricing page lists its SIEM editions as 'Get a quote', so the Splunk line is a break-even, not a price.

The arithmetic for Microsoft Sentinel is $4.30 plus $2.30 per GB, or $6.60, times 3,650 GB, which is $24,090 a year.

The Microsoft figures come from the public Azure Retail Prices feed (USD, East US), and the product page is Microsoft Sentinel pricing.

Datadog's Cloud SIEM price is $5 per GB analyzed a month on annual billing.

Three hundred GB times $5 is $1,500 a month, which over a year lands level with the Graylog figure.

Graylog's pricing page starts Security at $18,000 a year from 10 GB a day, so the two tie at this volume.

Elastic's serverless security pricing gives ingest as low as $0.09 per GB, or $328.50 a year at 10 GB a day.

Retention is extra, as low as $0.017 per GB a month. ManageEngine's figures are the annual rows of its Log360 pricing table.

IBM's QRadar page and Google's Security Operations page show no price, and Wazuh's homepage says its software has no licence cost.