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6 Free Obsidian Security Alternatives Ranked by Real Users (2026)

Explore 6 alternatives to Obsidian Security — vetted by our editors with real user reviews, pricing, and feature comparisons.

The 6 best free Obsidian Security alternatives at a glance

Quick answer

Our pick of free security information and event management (siem) software alternatives to Obsidian Security: AlienVault USM (from AT&T Cybersecurity), Blumira Automated Detection & Response and SolarWinds Security Event Manager. AlienVault USM (from AT&T Cybersecurity) leads the pack with a SpotScore of -1 and a 4.4★ rating. Compare all 6 on score, rating, and pricing below.

Finding a strong Obsidian Security alternative is mostly about knowing which tools deliver. These 6 security information and event management (siem) software free alternatives do, ranked by SpotScore, which combines real-user satisfaction with market presence, plus star ratings and pricing. We vet each one. Skim the table, then read the breakdowns below.

ProductSpotScoreRatingPricingBest for
AlienVault USM (from AT&T Cybersecurity)Streamline security, protect your enterprise everywhere.—★★★★☆ 4.4Freefrom $1,075.00 per monthteams of all sizes
Blumira Automated Detection & ResponseStay ahead of threats with proactive cybersecurity solutions.—★★★★★ 4.8FreeFreemium · Subscriptionteams of all sizes
SolarWinds Security Event ManagerProtecting your network, 24/7.—★★★★★ 4.6FreeFree Trial · One-time licenseteams of all sizes
IBM QRadarDetect threats, protect assets with IBM QRadar.—★★★★☆ 4.3(210)FreeFree Trial · Subscription · Quotation Basedmid-size & enterprise teams
EventSentryStreamline your server monitoring and log management.—Not yet ratedFreeFree Trial · Freemium · Quotation Basedteams of all sizes
CyStack PlatformEmpowering businesses to conquer cyber threats—Not yet ratedFreeFree Trial · Quotation Basedteams of all sizes
AlienVault USM (from AT&T Cybersecurity)

AlienVault USM (from AT&T Cybersecurity)

Streamline security, protect your enterprise everywhere.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.4

Add to compare

What is AlienVault USM (from AT&T Cybersecurity)?

Introducing AlienVault USM, the cutting-edge Unified Security Management (USM) platform from AT&T Cybersecurity. USM Anywhere revolutionizes security management by offering a cloud-based solution that streamlines threat detection, incident response, and compliance management across cloud, ...

Read more about AlienVault USM (from AT&T Cybersecurity)
Free TrialTry Free →
Blumira Automated Detection & Response

Blumira Automated Detection & Response

Stay ahead of threats with proactive cybersecurity solutions.

Best for: SMB teams · Mid-market · Enterprise

Try for Free

4.8

Add to compare

What is Blumira Automated Detection & Response?

Blumira is a cloud SIEM platform that provides automated threat detection and response for IT teams without a dedicated security operations center. It reduces alert overload, simplifies log management, and handles threat remediation automatically, keeping systems monitored without requiring ...

Read more about Blumira Automated Detection & Response

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SolarWinds Security Event Manager

SolarWinds Security Event Manager

Protecting your network, 24/7.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.6

Add to compare

What is SolarWinds Security Event Manager?

Introducing SolarWinds Security Event Manager – an innovative solution designed to enhance your cybersecurity defenses with ease and affordability. As a real-time Security Information and Event Management (SIEM) platform, Security Event Manager (SEM) works tirelessly to detect, alert, and ...

Read more about SolarWinds Security Event Manager
Free TrialTry Free →·

Starts from $2,525.00 when Billed Yearly

IBM QRadar - New SaaS Software

IBM QRadar

Detect threats, protect assets with IBM QRadar.

Best for: Mid-market · Enterprise

Start Free Trial

4.3

210 verified reviews

Add to compare

What is IBM QRadar?

IBM QRadar is a top-rated Security Information and Event Management software helping organizations detect and eliminate potential damage from network breaches and cyber-attacks. Implementing QRadar, teams can patch essential asset vulnerabilities and investigate suspicious activity quickly and ...

Read more about IBM QRadar
Free TrialTry Free →·

Starts from $800/Month

EventSentry - New SaaS Software

EventSentry

Streamline your server monitoring and log management.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

Add to compare

What is EventSentry?

EventSentry is a log and server monitoring tool designed to make workflows much easier. Get email alerts in response to monitored events, data and security codes, with embedded visual charts for analyzing performance. All of these metrics can be accessed via dashboard and made available across ...

Read more about EventSentry
Free TrialTry Free →·

EventSentry offers custom pricing plan

CyStack Platform - New SaaS Software

CyStack Platform

Empowering businesses to conquer cyber threats

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

Add to compare

What is CyStack Platform?

CyStack Platform is a revolutionary software designed to whip up cybersecurity solutions and automate tedious workflows for businesses of all sizes. The solution equips companies with tools to efficiently manage IT resources and monitor potential threats, while enabling them to detect and ...

Read more about CyStack Platform
Free Trial·

CyStack Platform offers custom pricing plan

What sets each pick apart

AlienVault USM (from AT&T Cybersecurity)Best for teams of all sizes
Blumira Automated Detection & ResponseBest for teams of all sizes
SolarWinds Security Event ManagerBest for teams of all sizes
IBM QRadarBest for mid-size & enterprise teams

Reviewers praise its log collection and event correlation for effective threat detection.

Watch for: Several reviewers find it complex and resource-heavy, sometimes hard to analyze logs.

EventSentryBest for teams of all sizes

Comprehensive monitoring

Watch for: May require technical expertise

CyStack PlatformBest for teams of all sizes

Automates cybersecurity workflows

Watch for: Complex setup process

Choosing a Obsidian Security alternative

How the 6 security information and event management (siem) software free alternatives compare, plainly: 6 offer a free tier; paid plans run $1075, with AlienVault USM (from AT&T Cybersecurity) the cheapest entry point; and IBM QRadar is the highest rated at 4.3★ across 210 reviews.

Our methodology.

Frequently Asked Questions (FAQs)

Stuck on something? We're here to help with all the questions and answers in one place.

The top-rated alternatives to Obsidian Security are Blumira Automated Detection & Response (4.8★), SolarWinds Security Event Manager (4.6★), AlienVault USM (from AT&T Cybersecurity) (4.4★). Compare all 6 alternatives side-by-side above.

When evaluating alternatives to Obsidian Security, prioritize: Threat Protection, Monitoring, User Activity Monitoring, Third-party Integration, transparent pricing, free trial availability, and integrations with your existing tools. Use the filters above to compare by feature, budget, and team size.

Migration difficulty depends on how deeply Obsidian Security is integrated into your workflows. Most alternatives offer data export/import tools and dedicated onboarding support. We recommend shortlisting 2–3 options, running a free trial, and checking each vendor's migration guides before committing.

How to pick the best Obsidian Security alternative

How to migrate from Obsidian Security

To switch off Obsidian Security without disruption, handle your data first: export it and test that the new tool imports it cleanly. Verify your key workflows still function, pilot the move on a free plan or trial, and keep Obsidian Security active until the cutover is complete.

Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].