Paying 5x Too Much for SIEM? Cut the Bill

Here’s an uncomfortable budget-season conversation that plays out in a lot of organisations: the CFO discovers the SIEM bill is several times larger than the cyber-insurance premium, and nobody can explain why monitoring the environment costs more than insuring it.

The honest answer is that many organisations are paying 5x too much for SIEM. Not because they need premium features, and not because they’re getting superior service — but because vendor lock-in and ingestion-based licensing models have quietly inflated the cost of a capability that open-source software now delivers extremely well.

This post compares Wazuh and Splunk directly: what each costs, where each one wins, and why a managed Wazuh deployment covers the core SIEM job for a fraction of a typical Splunk bill.

What a SIEM actually does

Before debating price, it’s worth pinning down what you’re buying. SIEM (Security Information and Event Management) platforms perform four core functions:

Log collection and aggregation. Firewalls, servers, applications, identity providers, and cloud services generate millions of events daily. The SIEM centralises them for analysis.
Real-time monitoring and alerting. Incoming logs are continuously checked against detection rules — failed logins, unusual data transfers, malware indicators.
Correlation. The platform connects events across systems to spot multi-step attacks that no single log line reveals: a failed login from a suspicious IP, a successful login minutes later, then a large download to an unfamiliar destination.
Compliance and reporting. For PCI DSS, HIPAA, SOC 2, or ISO 27001, the SIEM produces the audit trails and evidence that you’re monitoring your environment as required.

The key question: does that functionality inherently require a six-figure annual spend? It does not.

The Splunk Pricing Trap

Splunk is the dominant name in the SIEM market, and its licensing model is the main reason its bills grow faster than the security value they buy.

A few things to know up front: Splunk does not publish list pricing, and it has largely moved from per-GB ingestion licensing to workload-based pricing (Splunk Virtual Compute, or SVC). The figures below are industry-reported ranges, current at the time of writing — treat them as orientation, not a price sheet, and confirm against your own quote.

Industry-reported ingestion-era tiers looked roughly like this:

5 GB/day: reportedly in the $15,000–$25,000/year range
50 GB/day: reportedly $75,000–$150,000/year
100 GB/day: reportedly $150,000–$250,000/year
500 GB/day: reportedly $500,000 and up

Whatever the licensing metric, the structural problems are the same:

Log inflation works against you. Cloud migrations, microservices, containers, and SaaS apps all multiply log volume. Modernising your infrastructure raises your SIEM bill.
Feature gating. Enterprise Security is an add-on. SOAR is an add-on. Longer retention costs more. The base licence is the beginning, not the end.
Professional services. Implementation, training, and custom dashboards typically mean consultants billing hundreds of dollars per hour.
You own nothing. Stop paying and you lose access to your historical security data and your entire monitoring pipeline.

By the time licences, add-ons, retention, and services are totalled, mid-market Splunk deployments commonly land in the low-to-mid six figures annually — industry-reported, and again, confirm against your quote.

Meet Wazuh: the open-source alternative

Wazuh is a free, open-source SIEM and XDR platform. Out of the box it provides log collection and analysis, real-time alerting, file integrity monitoring, vulnerability detection, configuration assessment, intrusion detection, active response, and compliance reporting for PCI DSS, HIPAA, GDPR, and more.

It is not a “lite” SIEM. It’s a comprehensive platform that Wazuh reports is used by thousands of organisations globally, from startups to large enterprises and public-sector teams.

Wazuh vs Splunk: cost and capability comparison

	Splunk (Enterprise Security)	Wazuh (managed by ThinSky)
Licence model	Proprietary; workload (SVC) or ingest-based; unpublished list pricing	Open source (free licence); ThinSky charges flat annual pricing — request a quote
Typical annual cost	Commonly $150K–$500K+ at mid-market scale (industry-reported, at the time of writing — confirm against your quote)	Flat annual pricing independent of log volume — request a quote
Detection rules	Strong correlation engine; many organisations pay consultants to build out detection content	Ships 3,000+ out-of-the-box detection rules (Wazuh’s published count), tuned further per environment
MITRE ATT&CK mapping	Yes, via Enterprise Security	Yes, built in — alerts map to ATT&CK techniques natively
Where it wins	Risk-based alerting, ML-driven analytics, massive app ecosystem, ad-hoc search at very large scale	Cost predictability, no per-GB penalty, XDR + FIM + vulnerability detection included, full data ownership

The honest summary: Splunk is a more powerful analytics platform at the very high end. Wazuh covers the core SIEM/XDR job — detection, correlation, compliance evidence — without the volume-based pricing treadmill.

Open-source SIEM myths vs reality

The hesitation around open-source security tools usually comes down to four persistent myths.

Myth 1: “There’s no support.” Wazuh offers professional support, extensive documentation, and an active community. Managed providers like ThinSky target much faster first-response times than the multi-hour SLAs typical of large-vendor support queues.

Myth 2: “You can’t pass audits with it.” Wazuh is explicitly built for compliance, with rule sets and dashboards mapped to PCI DSS, HIPAA, GDPR, SOC 2, ISO 27001, and the NIST Cybersecurity Framework. Auditors care about capabilities and evidence, not vendor logos.

Myth 3: “Open source is less secure.” The code is publicly auditable, reviewed by researchers worldwide, and patched transparently. There’s no proprietary security-through-obscurity layer hiding defects.

Myth 4: “It’s too hard to implement.” Wazuh deployment is well documented, and a managed provider removes the implementation burden entirely — architecture, agents, integrations, and tuning are handled for you.

What managed Wazuh includes

The strongest argument against self-managed open source is the operational load: rule tuning, alert triage, upgrades, and expertise. Managed Wazuh closes that gap. ThinSky’s service includes:

Turnkey deployment — architecture design, manager/indexer/dashboard setup, agent rollout, integration with firewalls and cloud services, typically in two to four weeks, with detection tuning continuing over the first 60–90 days.
Continuous monitoring with senior on-call escalation — alert triage and false-positive filtering by Canadian security professionals, with incident escalation and response guidance.
Compliance support — pre-configured PCI DSS, HIPAA, SOC 2, and GDPR dashboards, on-demand audit reports, and evidence collection for auditors. (Pair it with a compliance sprint if you’re working toward a certification deadline.)
Threat intelligence — automatic feed updates, MITRE ATT&CK mapping, and emerging-threat briefings.
Ongoing optimisation and reporting — rule tuning, weekly summaries, monthly executive briefings, and quarterly posture reviews with a dedicated analyst team.

Pricing is flat and annual — no per-GB metering, no overage clauses, no data caps. Request a quote for your environment.

Stop overpaying for SIEM

“Nobody gets fired for choosing Splunk” has protected inflated SIEM pricing for years. But the landscape has changed: open-source platforms have matured, and managed services have removed the expertise barrier. For most mid-market organisations, there’s no technical reason the SIEM line item needs to be the largest number in the security budget.

If you’re rethinking the rest of the stack too, see how open source is reshaping enterprise security more broadly, and what incident response looks like without a CrowdStrike-sized bill.

FAQ

Is Wazuh as good as Splunk?

For core SIEM and XDR work — log collection, correlation, detection, file integrity monitoring, and compliance reporting — yes, Wazuh holds its own. Splunk still wins on risk-based alerting, machine-learning analytics, and the breadth of its app ecosystem. If you need those, you’ll know; most mid-market teams don’t, and they’re paying heavily for capabilities they never switch on.

How much does Splunk actually cost per year?

Splunk doesn’t publish list pricing, so there’s no official answer. Industry-reported figures put mid-market Splunk Enterprise Security deployments commonly in the $150K–$500K+ per year range once licences, add-ons, retention, and services are included — at the time of writing. Confirm against your own quote; workload-based (SVC) pricing makes individual bills vary widely.

What does managed Wazuh include?

Deployment and architecture, agent rollout, custom detection rules, continuous monitoring with senior on-call escalation, alert triage, compliance dashboards and audit evidence, threat-intelligence integration, and regular reporting. ThinSky’s managed Wazuh service is priced flat per year — request a quote for your environment.

Can Wazuh handle PCI DSS, SOC 2, or HIPAA compliance reporting?

Wazuh ships rule sets and dashboards mapped to PCI DSS, HIPAA, GDPR, SOC 2, ISO 27001, and NIST CSF, and it generates the monitoring evidence auditors ask for. To be clear: no SIEM makes you compliant or certified by itself — Wazuh collects and organises the evidence; your controls and processes do the rest.

Is Wazuh really free?

The software is genuinely free and open source — there’s no licence fee at any log volume. The real costs are infrastructure to run it and the expertise to deploy, tune, and monitor it. That’s the part a managed service covers, and it’s still a fraction of a commercial SIEM licence.

Want to see what your environment looks like to an attacker before you commit to anything? Start with a free external security audit, or talk to us about managed Wazuh — email sales@thinsky.com or request a quote and we’ll price your environment with flat annual pricing, no ingestion math required.