Free DISA STIG Compliance Tool
Scored DISA STIG compliance for Windows, macOS, Ubuntu 20.04, 22.04 and 24.04 LTS, and RHEL 8 and 9, plus Microsoft Security Baselines for Windows, in one console with trend tracking. 200 endpoints free forever.
What a free STIG compliance tool should do
Most free ways to check STIG compliance hand you a raw scan and stop there. The official viewer does not ship the benchmark library at all: you download STIG content separately, import it, and manage checklists one target at a time. The official scanner reads SCAP content you supply and reports per target. Open-source scanners emit XML or ARF you then have to store, diff, and chart yourself. Wazuh comes closest to an exception, since it does aggregate agent results in its own dashboard, but it ships no DISA STIG content and scores each agent against each policy rather than producing one number for the fleet.
The useful question is whether a tool produces a per-control score you can track over time, across the operating systems you run, and whether the benchmark content arrives with it rather than as a separate download you have to keep current. The table below sorts the main free options by exactly that, and names where each one stops.
The free options, compared
A fair look at the main free ways to assess DISA STIG compliance today, checked against each vendor's own pages. Evaluate-STIG is not compared here: it is distributed through NAVSEA, and we neither ship nor redistribute it.
| Tool | Free limit | Benchmark content | Platforms | Scored output | The catch |
|---|---|---|---|---|---|
| TridentStack Control | 200 endpoints, forever | DISA STIG and MS baselines, kept current | Windows, macOS, Ubuntu LTS, RHEL | Yes, 1 to 100 with trend | $5/endpoint/mo past 200, all features |
| DISA STIG Viewer 3 | Free, no account needed | Not included; import separately | Windows, Linux (not macOS) | Per-checklist, no fleet score | Imports scan results; no fleet dashboard |
| SCAP Compliance Checker (DISA) | Free, no affiliation required | Not included; supply SCAP content | Windows, Linux, Solaris, some network devices | Per target, no documented fleet score | No hosted console; aggregate it yourself |
| OpenSCAP + SCAP Security Guide | Free/OSS, no cap | Community STIG profiles; official separate | Linux (profile coverage varies by platform) | Per scan, no central dashboard | CLI and XML; you build all the reporting |
| Wazuh SCA | Free/OSS, self-hosted | Wazuh's own YAML policies; no DISA STIG content | Windows, macOS, Linux (agent) | Percentage per agent and policy | No DISA XCCDF support; score is per agent |
| Microsoft SCT | Free download | Microsoft baselines only; no DISA STIG | Windows | No, policy diffs | Diffs policy; does not scan endpoints |
| Lynis (CISOfy) | Free/OSS, one system at a time | Its own audit tests; no DISA STIG content | Linux, macOS, Unix (no Windows) | Hardening index, not per-control pass/fail | Central reporting is paid Lynis Enterprise |
Free tiers verified against each vendor's own page.
What is in the free tier
Scored compliance for your first 200 endpoints, at no cost, on Windows, macOS, Ubuntu 20.04, 22.04 and 24.04 LTS, and RHEL 8 and 9.
Scored DISA STIG assessment
Per-control STIG assessment with a numeric score you can track, not a raw checklist dump you have to chart yourself.
Benchmark content included
The STIG content ships with the platform and is kept current for you. There is no separate library to download, import, and version by hand.
Microsoft Security Baselines
Microsoft's recommended Windows baselines assessed and scored, not just exported as a policy diff.
Mixed fleets scored the same way
The STIGs for Windows, for macOS, and for Ubuntu 20.04, 22.04 and 24.04 LTS and RHEL 8 and 9 are scored the same way, from one console.
NIST 800-53 reporting
STIG results are mapped to NIST 800-53 through the CCI references the STIG content carries, so a failing control traces to the 800-53 control it supports.
Trend tracking and exceptions
Watch scores move over time, and record exceptions with an expiration date and an audit trail.
Unlimited admin users
Bring your whole team. Role-based access is included, with no per-seat fees on the free tier.
When you outgrow free
Past your first 200 endpoints it is $5 per endpoint per month, every feature still included, no tiers. See the pricing calculator.
STIG compliance across a mixed fleet
A STIG assessment that only covers Windows leaves the rest of the fleet unscored. TridentStack Control evaluates the STIGs for Windows, for macOS, and for Ubuntu 20.04, 22.04 and 24.04 LTS and RHEL 8 and 9 on the same agent, so a mixed fleet produces one comparable set of scores instead of three separate workflows. Debian and Rocky Linux endpoints are still patched and still report vulnerabilities; they have no compliance framework to score against.
That is the difference between a raw STIG scan and a scored assessment. A one-off SCAP or XML scan tells you the state of one machine at one moment; a scored, trended console shows whether the whole fleet is drifting toward or away from the baseline, and lets you attach dated exceptions to the controls you have formally accepted.
More free tools from TridentStack Control
Free Patch Management Software
Patch Windows, macOS, and Linux from one console. 200 endpoints free forever.
Free Vulnerability Scanner
Continuous, agent-based CVE detection with CVSS prioritization across your fleet.
Free Endpoint Management Software
A web settings catalog with enforcement that works without Active Directory.
Free Group Policy Alternative
Enforce settings across Windows, macOS, and Linux without a domain controller.
Frequently asked questions
Is there a free DISA STIG scanner?
Several, and they are free in different ways. DISA publishes STIG Viewer and the SCAP Compliance Checker at no cost and with no account gate, but neither bundles the benchmark library: you download STIG or SCAP content separately and both report per target rather than across a fleet. OpenSCAP with the SCAP Security Guide is fully open source and ships STIG-aligned profiles, but it is a command-line and XML workflow with no central dashboard. TridentStack Control's free tier scores 200 endpoints against STIG content that ships with the platform, in a hosted console with trend tracking.
Do you cover macOS?
Yes. The DISA STIG for macOS is scored the same way as Windows and the Linux releases we score, so a mixed fleet is assessed from one console. Note that the official DISA STIG Viewer 3 is not supported on macOS at all.
Which Linux distributions do you score?
Ubuntu 20.04, 22.04 and 24.04 LTS, and RHEL 8 and 9. Debian and Rocky Linux endpoints are patched and scanned for vulnerabilities like any other, but they have no compliance framework to score against, so they carry no compliance score.
Do you score against NIST 800-53?
We do not ship a NIST baseline you can scan against. STIG controls carry CCI references, and TridentStack Control resolves those to NIST 800-53 controls when it builds a report, so a passing or failing STIG control traces back to the 800-53 control it supports. Reports are labelled as STIG results mapped to NIST 800-53, because the scoring is done against the STIG.
Do you need a paid membership for commercial use?
No. Your first 200 endpoints are licensed for production use at no cost, with every feature included.
Is it really free forever, and do I need a credit card?
Your first 200 endpoints are free forever with every feature included, and you can start without entering payment details. It is not a trial and it does not expire.
Start scoring compliance, free
200 endpoints free forever, every framework included. No credit card, no time limit.
Competitor facts verified against each vendor page. Last verified 2026-09-09.