Open-source SOC vs. expensive SIEM: how to choose for your business

Before comparing, let's agree on the terms — without them, any security conversation turns into alphabet soup.

• SIEM — software that gathers events from all your systems (servers, computers, network gear) in one place and looks for the suspicious ones: unusual logins, access attempts, changes to important files.
• SOC (Security Operations Center) — the people and processes around the SIEM: someone who watches the alerts, separates false from real, and responds. A SIEM without a SOC is a camera no one is watching.

When people say "we need security monitoring," they usually mean both: the tool plus someone who works with it.

Enterprise SIEM-class systems (the classic example being Splunk and its peers) have traditionally charged by the volume of data you load into them — by the gigabytes of events per day. The vendor's logic is understandable, but for a business it has an unpleasant property: the more you grow and the more closely you want to watch your security, the more you pay. The annual price tag of an enterprise SIEM for a mid-sized business can rival a full-time employee's yearly salary — the exact figure depends on event volume and vendor, and that's the license alone, before the people who'll actually work with it.

This is exactly why so many companies end up in the "expensive or nothing" trap: the enterprise system is unaffordable, and going without monitoring is risky. The open stack offers a third option.

Open solutions (Wazuh at the core, plus tools for network monitoring, storage, and visualization) cover the same class of tasks as a proprietary SIEM: event collection, anomaly detection, file integrity monitoring, vulnerability detection, and incident response.

What you get:

• No license fee. The money goes to deployment and support, not to the right to use the software.
• Control over your data. Monitoring and events stay within your perimeter or in the country — which matters both for trust and for data requirements in Azerbaijan. Where to host it — on your facility or with a local provider — is your call (see infrastructure and data).
• Customization. Open code can be adapted: decoders and rules for your systems (1C, industry applications, hardware) that a closed box simply doesn't know about. That's the core of the open-source cybersecurity service.

What the open stack does NOT give you out of the box:

• Certified out-of-the-box settings for a specific standard — these have to be configured for you.
• A single vendor with an SLA to hold accountable for everything. Responsibility sits with your team or a support provider.
• Magical cheapness. More on that separately, because it's the central misconception.

No license is not the same as no cost. The total cost of ownership for monitoring on an open stack comes from what gets forgotten amid the excitement of "no licenses":

• Deployment. A stack of several products (event collection, network monitoring, storage, visualization, response) has to be assembled, connected, and tuned to your infrastructure.
• Support. Updates, version compatibility, rule tuning, fighting false alarms — that's ongoing work, not "set it and forget it."
• Expertise. Writing rules and triaging incidents takes skill. Without it, the open stack gives you visibility but not mature protection.

So the honest comparison isn't "license versus zero" — it's total cost of ownership over several years: license + support in the proprietary case versus deployment + support in the open one. At high data volumes the open stack has no per-gigabyte fee, so it tends to come out cheaper; at small volumes and without an in-house team, the gap narrows.

Question 1 — Volume and growth. Do you collect a lot of events, and is the volume growing? → A lot / growing → a proprietary SIEM license will keep getting more expensive; the open stack wins. → Little and stable → the price gap is smaller; cost out both options.

Question 2 — Data and sovereignty. Must the data stay within your perimeter / in the country? → Yes → an open stack on your own facility or with a local provider is the natural choice. → Doesn't matter → this criterion doesn't apply; decide on price and support.

Question 3 — Support. Do you have a team to operate it (or are you willing to outsource)? → Yes / outsourcing → the open stack is feasible and worthwhile. → No, and no plans to → either proprietary turnkey, or the open stack as a managed service (support on the provider's side).

Criterion	Proprietary SIEM	Open stack (Wazuh and others)
License	Charged by event volume, grows	None
Where the money goes	License + people	Deployment + support
Where the data lives	Often vendor cloud (abroad)	Your perimeter / country
Customization	Within vendor limits	Written for your systems
Support	One vendor, SLA	Your team or a provider
Out-of-the-box settings	Ready, certified	Configured for you
Value at high volumes	Gets more expensive	Independent of volume

The same shift is happening in virtualization: after VMware's price hikes, businesses are looking en masse toward open platforms — covered separately in the article VMware to Proxmox migration.

We build open solutions — but we don't believe they fit everyone. A proprietary SIEM is the right call when several conditions line up: you need a single vendor to hold accountable for the whole result; you have no support team and no plans for one, and you don't want to outsource; you need ready-made settings for a specific certification where the vendor is already accredited. In those cases the license is the price of offloading responsibility and complexity — and it can be justified. Pushing an open stack on someone who can't support it is a disservice.

• Which is more cost-effective — an open-source SOC or an enterprise SIEM (Splunk)? The open stack wins at large and growing data volumes and where data must stay in the country. Proprietary wins when you need a single vendor with an SLA and have no in-house team. It's calculated on your numbers.
• Is there a free SIEM for business? The license can be free (as with Wazuh), but security overall isn't: deployment and support cost money. "Free SIEM" is the central misconception; the honest move is to compare total cost of ownership over several years.
• What is Wazuh? An open security monitoring system (SIEM/XDR): it collects events from servers and computers, finds threats, and monitors file integrity and vulnerabilities. The license itself is free, but deployment and support are not — and the code can be adapted to your systems.
• Is open-source more or less secure than paid? Not necessarily less. Open code is reviewed by the whole community, not a single vendor. Security comes down to the quality of configuration and support, not the price tag.
• Does it fit data requirements in Azerbaijan? Yes — the open stack can be hosted so the data stays in the country and configured to data-protection and critical-infrastructure requirements.