What is the best SIEM for a business in 2026?
The one your team actually has time to run. A SIEM nobody tunes mostly produces noise. On budget, published prices run from $0 (self-hosted Wazuh) to $18,000 a year (Graylog Security).
A SIEM (security information and event management) pulls logs from every source you have: firewalls, Active Directory or Entra ID, Microsoft 365, servers, cloud accounts and your EDR. It normalizes them, stores them, and correlates them to catch what no single source sees on its own, like a sign-in from abroad followed by a new admin account ten minutes later.
The short answer: if your company runs on Microsoft 365 and Azure, Microsoft Sentinel is the strongest starting point, with ready-made Microsoft connectors and some free ingestion on eligible Microsoft 365 security logs. If you want a published per-GB price, Elastic Security lists $0.09 per GB ingested. If you are a small business with no security analyst, Blumira charges per employee with unlimited ingestion.
A SIEM does not replace an EDR. The EDR protects each device and stops an attack where it starts. The SIEM watches the whole environment. For endpoint protection, see our antivirus and EDR ranking.
Our ranking is editorial: a sponsored spot is always labeled on its card, and no affiliate link ever changes a score.
The best SIEM for your company
Ready Microsoft connectors, commitment tiers from 100 to 50,000 GB a day
Predictable per-GB budgetServerless ingest from $0.09 per GB, Elastic Defend EDR included
Small business, no analystFrom $12 per employee a month, unlimited ingestion, one year of retention
The 8 SIEM tools compared
The full ranking. The "pricing model" column tells you what you are billed on, because that is what decides whether your invoice doubles when your logs grow. Prices are the ones vendors publish; where there is no public number, we say so instead of quoting a reseller.
| Best for | Pricing model | Free plan | Team size | Visit | ||||
|---|---|---|---|---|---|---|---|---|
| 1 | Microsoft Sentinel | Best for Microsoft 365 shops | Per GB ingested, with commitment tiers | 4.3/5 | Per GB, see Azure calculator | — | SMBs and mid-market on Microsoft 365 and Azure | Visit → |
| 2 | Elastic Security | Best published per-GB pricing | Per GB: $0.09 ingest, $0.017 per month retention | 4.3/5 | From $0.09/GB ingested | — | SMBs and mid-market with a small technical team | Visit → |
| 3 | Splunk Enterprise Security | Best for deep investigation | Per GB a day, or per compute (workload) | 4.2/5 | Quote only | — | Mid-market and enterprise with a security team | Visit → |
| 4 | Wazuh | Best open-source SIEM | Free self-hosted; cloud per agent | 4.1/5 | Free, cloud from $571/mo | ✓ | SMBs with a sysadmin who has time | Visit → |
| 5 | Blumira | Best for small businesses without an analyst | Per employee, unlimited ingestion | 4.1/5 | From $12/employee/mo | — | Small businesses with an IT generalist | Visit → |
| 6 | Google Security Operations | Best for very large log volumes | Per ingestion, three tiers | 4.0/5 | Quote only | — | Mid-market and enterprise, high log volume | Visit → |
| 7 | Guardsix (ex-Logpoint) | Best volume-independent licensing | Per node, not per GB | 3.9/5 | Quote only, per node | — | Mid-market with unpredictable log volume | Visit → |
| 8 | Graylog Security | Best path up from a free log tool | Free Open, Security from $18,000/yr | 3.8/5 | Open free, Security from $18,000/yr | ✓ | SMBs already centralizing logs | Visit → |
Prices read on official vendor pages in 2026, before tax. None of these tools has a Labs review yet: scores are this ranking's. Rank follows fit for a small or mid-sized business, not the score alone.
Is your tool missing from this page? Email us: hello@hackceleration.com
How we compared and scored
Most top-ranking SIEM lists are written by a vendor that puts itself first, or they quote prices pulled from resellers that contradict each other. Almost none of them talk about the hours it takes to run the thing, and few mention that IBM sold its QRadar SaaS business to Palo Alto Networks in 2024.
We read official pricing pages, licensing docs, sysadmin threads and user reviews, with extra weight on the negative ones. Detection carries the biggest weight because it is the reason you buy a SIEM. Pricing clarity gets 25% because it is the number one source of buyer regret: on a per-GB SIEM, every new source you connect makes the bill bigger.
- Ease of operationThe weekly time it takes to tune rules, triage alerts and keep the platform up to date.20%
- Pricing clarityA public price or a model you can estimate, and an invoice that does not double when log volume grows.25%
- Detection and correlationOut-of-the-box rules, cross-source correlation, behavior analytics, fast incident investigation.30%
- Support and servicesVendor support quality and partners who can deploy and monitor for you.10%
- Available connectorsNumber and quality of connectors to your sources: Microsoft 365, firewalls, cloud, EDR, business apps.15%
No affiliate link ever changes a score or a rank.
Microsoft Sentinel
Sentinel is Microsoft's cloud SIEM, running in Azure. Its edge is connectors. Microsoft 365, Entra ID, Defender and Azure services plug in from the console, no collector to install. If you are already in that world, it is the shortest path from purchase to a useful first alert.
You pay per GB ingested, either pay-as-you-go or through a daily commitment tier from 100 to 50,000 GB, which cuts the rate by up to 52%. Eligible Microsoft 365 customers also get some free ingestion on key security logs, up to 5 MB per user per day. The exact per-GB rate is not shown on the public pricing page; you get it from the Azure pricing calculator for your region.
The trap shows up in nearly every admin thread: the bill follows volume. Sending raw firewall logs or every server's event log can multiply it fast. Filter before you ingest, and push low-value logs to the cheaper archive tier.
- Ready-made Microsoft connectors
- Commitment tiers up to 52% cheaper
- Free ingestion on some Microsoft 365 logs
- ✓Fast start on Microsoft 365
- ✓Cheaper archive tier for low-value logs
- ✓Pay-as-you-go option
- ✗Bill climbs with log volume
- ✗Per-GB rate hidden in the Azure calculator
- ✗Less at home outside Microsoft
The best pick when your stack is Microsoft first. Estimate your daily log volume before you sign, and decide on day one what goes to the archive tier.
Elastic Security
Elastic Security runs on Elasticsearch, the engine known for searching billions of log lines in seconds. The serverless offer, hosted by Elastic, has the clearest price sheet in this market: $0.09 per GB ingested on Essentials, $0.11 on Complete, plus monthly storage. In 2026, Elastic dropped per-endpoint fees.
Quick math: 10 GB of logs a day is about 300 GB a month, so roughly $27 a month in ingest on Essentials. Storage at $0.017 per GB per month stacks up with whatever retention you pick. Elastic Defend, its EDR, is included, so you can cover endpoints without buying a second product, though a dedicated EDR is often simpler for a small team to manage.
The catch is operations. Elastic ships ready detection rules, but getting the most out of it takes someone who can write queries and tune rules.
- Public per-GB price sheet
- No per-endpoint fees in 2026
- Elastic Defend EDR included
- ✓Easy to estimate cost upfront
- ✓Very fast search at scale
- ✓Free trial, no commitment
- ✗Retention billed on top of ingest
- ✗Needs query skills
- ✗Rules need tuning to your sources
The best SIEM if you want to know your bill before you sign. Budget engineer time for rule tuning, or a partner who does it.
Splunk Enterprise Security
Splunk, now part of Cisco, is still the reference platform in security operations centers. Its search language lets you correlate almost anything, and its app ecosystem covers most of the gear you will find in a network. For a team that knows it, it is the deepest investigation tool on this list.
You pick between two licensing models: pay for daily ingest volume, or pay for the compute your searches consume. Workload pricing favors teams that ingest a lot but search less. No price is published; everything goes through sales.
The negative reviews repeat the same two points: cost jumps as volume grows, and it is hard going for a small team. Without at least one trained person, you pay for a very powerful platform and use a fifth of it.
- Very powerful search language
- Apps for nearly every source
- Two licensing models
- ✓Deepest incident investigation
- ✓Huge partner ecosystem
- ✓Workload licensing available
- ✗No public price
- ✗Expensive as volume grows
- ✗Too heavy for a small team
The choice for an established security team. For a small business without an analyst, it is too much tool and too much invoice.
Wazuh
Wazuh is an open-source SIEM with an agent on each machine that ships logs and security events back to the platform. Self-hosted, there is no license fee. It is the tool that comes up most often when small-business admins compare SIEMs on Reddit.
If you don't want to run the servers, Wazuh Cloud charges per agent: $571 a month up to 100 agents, $923 up to 250, $1,467 up to 500. That is $6,852 a year for 100 agents, with one month of searchable data and three months of archive; from Medium up, three months searchable and a year of archive. Custom plans go beyond that.
Free has a price: time. Field feedback talks about a complex setup and many hours spent tuning rules and dashboards. Count that engineer time before you decide Wazuh is cheaper than a paid SIEM.
- Free license when self-hosted
- Agent on every monitored machine
- Cloud priced per agent
- ✓Zero license cost
- ✓Large user community
- ✓Public, predictable cloud prices
- ✗Long, technical setup
- ✗Short retention on Small (1 month)
- ✗No vendor support on the free version
The best value if you have the hours to run it. Without an available admin, the license savings vanish into tuning time.
Blumira
Blumira is a US vendor built for small and mid-sized businesses. It takes the opposite approach to Splunk: a simple price, unlimited ingestion, and a product sold to IT generalists rather than to seasoned analysts.
Pricing is per employee, with unlimited ingestion and a year of retention included: $12 per employee a month on Detect, $16 on Respond, $21 on Automate. For 100 employees, that is $1,200 to $2,100 a month. Contracts are annual and there is a one-time onboarding fee, so ask for that number in writing. Extra agents cost $3 a month.
The limit is depth. A mature security team will find fewer custom search and correlation options than in Elastic or Splunk, and per-employee pricing gets less attractive as headcount grows faster than data.
- Unlimited ingestion
- One year of retention included
- Price by employee, not by GB
- ✓Price does not move with log volume
- ✓Annual budget known upfront
- ✓30-day trial
- ✗Less depth for expert teams
- ✗Annual contract plus onboarding fee
- ✗Per-employee cost grows with headcount
The easiest SIEM to justify for a small business without a security team. If you already have analysts, Elastic gives them more room.
Google Security Operations
Google Security Operations, formerly Chronicle, is Google Cloud's SIEM. It is built to swallow very large volumes and search months of history without slowing down. It comes in three tiers, Standard, Enterprise and Enterprise Plus, from the leanest to the fullest: ask for the exact feature list of each before you compare quotes.
Pricing is based on ingestion and goes through sales. Numbers you may see in public procurement catalogs are not Google's own list prices, so don't anchor on them.
It is a tool for a security team. For a small business without an analyst, the search power does not make up for the setup and tuning effort.
- Built for very large volumes
- Infrastructure run by Google
- Three tiers by need
- ✓Fast search over long history
- ✓Tiers that grow with the team
- ✓No servers to manage
- ✗No public price
- ✗Oversized for a small business
- ✗Needs a trained team
A strong choice for a security operations team handling lots of data. Below that size, Sentinel or Elastic are easier to justify.
Guardsix (ex-Logpoint)
Guardsix (ex-Logpoint) is a European vendor. What sets it apart is licensing: you pay per node, meaning per monitored source, not per GB. If a firewall suddenly gets chatty, your bill stays put. For a buyer burned by a per-GB SIEM, that is the main argument.
Ask the node question first: does a server, a firewall and a cloud app each count as one? Get the definition in writing. Guardsix mostly sells to European mid-market companies and to providers reselling managed monitoring.
The limit: no public price, and a smaller user community than Splunk or Elastic. You will find fewer shared rules and fewer answers on forums.
- Per-node licensing
- European vendor
- Volume spikes don't change the bill
- ✓Easier budget to defend
- ✗No public price
- ✗Smaller community
- ✗Few recent user reviews
The right pick if your main fear is a bill that tracks your gigabytes. Count your nodes precisely before asking for a quote.
Graylog Security
Graylog started as a log management tool and is widely used for free by ops teams. Graylog Open has no volume cap and comes with community support. It is often the first thing an admin sets up to stop hunting logs server by server.
Graylog Security adds the security features on top of that base. It starts at $18,000 a year, from 10 GB a day. Graylog Enterprise, more ops-focused, starts at $15,000 a year.
The limit: for pure security use, Graylog is less security-focused than Sentinel or Elastic. Its real appeal is continuity if you already run it.
- Free Open edition with no cap
- Public prices on paid tiers
- Upgrade without migrating
- ✓Free starting point
- ✓Entry prices listed
- ✓Simple log centralization
- ✗Security tier starts at $18,000 a year
- ✗Less security-focused than rivals
- ✗Community-only support on Open
The right path if your logs already live in Graylog Open. Starting from scratch on security, Elastic or Wazuh go further for less.
What a SIEM really costs, and who runs it
Three questions decide a SIEM purchase far more than the feature list: what you are billed on, who triages the alerts, and what your EDR already covers.
The pricing model is the bill
Who watches the alerts
SIEM and EDR are different jobs
- Measure your daily log volume, source by source, before any quote.
- List your priority sources: directory, Microsoft 365, firewall, EDR, critical servers.
- Ask how many detection rules ship ready to use.
- Name the person or provider who triages alerts at night and on weekends.
- Set the retention your contracts and insurers require before comparing storage prices.
- If you already pay for a managed SOC, check whether it includes its own SIEM.
Six field-proven tips for a SIEM that doesn't bury your team
Most failed SIEM projects don't fail on the tool. They fail on too many logs, too many alerts and not enough time. Here is what keeps coming up from teams that have rolled one out.
Start with three sources, not thirty
Day oneYour directory (Active Directory or Entra ID), email and firewall cover most common attacks: account takeover, phishing, odd sign-ins. Connect those three, tune their alerts, then add sources one at a time. Plugging in everything on day one buries the team and inflates the bill.
- First sources
- Directory, email, firewall
Filter before you ingest
BudgetOn a per-GB SIEM, every useless line costs money. Debug logs, bulk allowed connections and duplicates almost never help an investigation. Drop them at the collector, or route them to a cheaper archive tier where the tool supports it.
- Filter first
- Debug logs and duplicates
Turn on rules one family at a time
False positivesFalse positives are the top complaint from SIEM users, whatever the vendor. Enable one rule family, watch it for a week, adjust thresholds and exceptions, then move on. A team that gets 200 alerts a day ends up reading none.
- Pace
- One rule family a week
Split hot search from archive
StorageYou don't need second-level search on ten-month-old logs. Keep 30 to 90 days hot and archive the rest. Wazuh Cloud already works this way (on Small, one month searchable and three archived), and Sentinel and Elastic let you set it up too.
- Hot tier
- 30 to 90 days
Send EDR alerts, not all its telemetry
VolumeFull EDR telemetry is often the biggest log source in a small business. For correlation, alerts and key events are enough. Keep detailed telemetry in the EDR console, where you have already paid for it.
- Send to the SIEM
- Alerts and key events
Replay a known attack before sign-off
CheckBefore you close the project, run a simple scenario: several failed sign-ins then a success from an unusual country, or a new admin account created after hours. If the SIEM raises nothing, you have a configuration gap, not protection.
- Base scenario
- Odd sign-in, then new admin
Your SIEM is picked, now what
A SIEM works better with protected endpoints, a clean asset inventory and mapped risks. These pages cover the neighboring topics.
Detection and response on every device.
You want to know which machines to monitorBest IT asset management softwareInventory, licenses and updates.
You are preparing for an audit or a frameworkBest GRC softwareRisk, compliance and audit evidence.
SIEM tools · FAQ
What is a SIEM in plain terms?
It is a tool that collects security logs from all your sources, keeps them, and cross-checks them to spot an attack. It sees that a suspicious email sign-in was followed ten minutes later by a new account in your directory. No single source raises that alert on its own.What is the difference between SIEM, EDR and XDR?
An EDR watches and protects each endpoint. A SIEM centralizes logs from the whole environment, endpoints included. XDR is a vendor offer that stretches its EDR to other sources, usually its own. Small businesses usually start with EDR, then add a SIEM or a managed SOC.How much does a SIEM cost for a small business?
Among vendors that publish prices, from $0 in license (self-hosted Wazuh) to $18,000 a year (Graylog Security). Wazuh Cloud is $571 a month up to 100 agents, and Blumira runs $12 to $21 per employee a month. On Elastic, 10 GB a day is about $27 a month in ingest, before storage. Always add the people time.Is there a free SIEM?
Yes. Wazuh is open source and free to self-host, and Graylog Open is free with no volume cap. Either way you pay in time: install, updates, rule tuning. Plan several days to get going and a weekly check after that.Do I need a SIEM if I already have an EDR?
Not always. If your EDR is watched by an MDR provider, it covers most attacks on endpoints. A SIEM becomes useful when you need to correlate identity, email, firewall and cloud logs, or when a customer or insurer asks for centralized log retention.Should I buy a SIEM or a managed SOC?
Without an in-house analyst, a managed SOC is usually more realistic. A SIEM nobody reads does almost nothing. Many providers bring their own SIEM, so compare the full service price with a SIEM plus a half-time hire.Is Microsoft Sentinel expensive?
It depends almost entirely on volume. Sentinel bills per GB ingested, with commitment tiers that cut the rate by up to 52%, and eligible Microsoft 365 customers get some free ingestion on key security logs. The bill gets painful when you ingest raw firewall or server logs without filtering.What happened to IBM QRadar?
IBM sold QRadar SaaS to Palo Alto Networks in 2024, with a migration path to Cortex XSIAM. If you run QRadar, ask your integrator about the support timeline for your version before renewing.