- Container security tools side by side
- Ten container security tools worth a look
- Where to start
- Each layer needs its own checks
- Scanner, posture tool or runtime platform?
- Questions to ask before you choose
- Signs your containers need more security
- My plain advice on container security tools
- Frequently asked questions
The best container security tools check your images for vulnerabilities and misconfigurations before deployment, harden what runs in Kubernetes, and watch containers at runtime for suspicious behaviour. Several of the most popular tools are free and open source, while commercial platforms join them up across clouds. Ten options follow in no particular order.
Containers made shipping software faster, and they made it easy to ship a vulnerable base image to hundreds of servers in minutes. Security has to move at the same speed.
The ten tools below are listed alphabetically and in no particular order, and every description comes from the vendor's own website, read this week. If you're growing the team that runs this, my piece on finding remote DevOps talent may help.
Container security tools side by side
I checked the free plan column on each tool's own website, as of Oct 2026. Yes means the site names a free plan, a free version, a free edition or an open source edition. Trial only means a time-limited trial. Not stated means the pages I read named neither, even where there's a button inviting you to try it, so check the vendor's page before you sign up.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Anchore Enterprise | SBOM-powered container security | SBOMs and compliance for images | Trial only |
| Aqua | Cloud native security platform | Runtime protection for containers | Not stated |
| Chainguard | Trusted open source images | Starting from hardened base images | Not stated |
| Docker Scout | Software supply chain management | Developers already on Docker | Trial only |
| Falco | Open source runtime security | Detecting threats at runtime | Yes |
| Kubescape | Open source Kubernetes security | Kubernetes posture and scanning | Yes |
| SUSE Security | Open source container security | Zero trust container networking | Yes |
| Sysdig Secure | Runtime cloud security | Kubernetes and cloud detection | Not stated |
| Trivy | All-in-one security scanner | Free scanning in CI pipelines | Yes |
| Upwind | Cloud and AI security | Runtime-first cloud protection | Not stated |
Ten container security tools worth a look
Anchore Enterprise
Best for: Teams who want SBOM-powered software composition analysis and compliance checks for container images, with a free trial.
Aqua
Best for: Organisations who want container and serverless security with runtime monitoring that detects exploitation as it happens.
Chainguard
Best for: Platform engineers who want to start from trusted open source container images so fewer vulnerabilities reach production.
Docker Scout
Best for: Developers who want image analysis built into the Docker tools they already use, with enterprise features if needed.
Falco
Best for: Teams who want an open source, multi-vendor runtime security tool across hosts, containers, Kubernetes and cloud environments.
Kubescape
Best for: Kubernetes users who want an open source security platform with practical, end-to-end coverage in a single community project.
SUSE Security
Best for: Rancher and Kubernetes users who want a fully open source, zero trust container security platform from SUSE.
Sysdig Secure
Best for: Security teams who want prevention, detection and response across containers, Kubernetes, identities and cloud services.
Trivy
Best for: Developers who want an open source scanner for vulnerabilities and misconfigurations in images, repos and Kubernetes clusters.
Upwind
Best for: Cloud teams who want runtime-led cloud detection and response alongside API security and DAST in one platform.
Where to start
- Free image and cluster scanning: Trivy or Kubescape.
- Open source runtime detection: Falco.
- Starting from hardened images: Chainguard.
- Developers already on Docker: Docker Scout.
- SBOMs and compliance for images: Anchore Enterprise.
- Rancher and zero trust networking: SUSE Security.
- Full runtime cloud platforms: Aqua, Sysdig Secure or Upwind.
Each layer needs its own checks
NIST's SP 800-190, the Application Container Security Guide published in 2017, describes containers as a form of operating system virtualization combined with application software packaging, and sets out the security concerns and recommendations for using them.
The point that still matters is that images, registries, orchestrators and hosts each carry their own risks. A scan at build time helps, but it won't catch a misconfigured cluster or an attack at runtime.
Scanner, posture tool or runtime platform?
Image scanners find known vulnerabilities and misconfigurations before deployment. They're quick to add to a pipeline and many are free.
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Posture and runtime tools watch clusters and running containers for risky settings and suspicious behaviour. They take more effort to tune, but they cover what happens after the build.
Open source is a fair place to start here. Several of the tools on this list are free, widely used and well documented, so you can learn what your images and clusters really look like before you talk to a vendor. You'll ask better questions in the demo, and you won't pay for features you don't need.
Just don't let free tools become shelfware. Give one person ownership of the findings, agree which severities block a release, and review the exceptions every month.
Containers often expose APIs, and our round-up of API security tools covers tools that test and protect those endpoints.
Questions to ask before you choose
- Where do we build and store our images?
- Can it scan in our CI pipeline and registry?
- Does it check Kubernetes configuration?
- Does it detect threats at runtime?
- How noisy are its findings?
- Do we want open source or a supported platform?
Scanning images is only half of it, since our round-up of software composition analysis tools compares tools that check the open source packages inside them.
Signs your containers need more security
- Images are never scanned. Add a pipeline scanner.
- Base images are years old. Rebuild on fresh ones.
- Clusters run with defaults. Check Kubernetes posture.
- Nobody watches runtime. Add threat detection.
Do you make container, Kubernetes or cloud security tools? Tool makers can ask to be considered for a featured place on this list.
My plain advice on container security tools
Add a free scanner to your build pipeline this week and fail builds on critical issues with a fix available. It's the easiest win in container security and it stops the worst images ever reaching production.
Then fix the base images, because most findings come from them. My piece on cybersecurity essentials for customer-facing platforms covers the wider checklist.
Frequently asked questions
What is container security?
It's the practice of protecting container images, registries, orchestrators such as Kubernetes, and running containers from vulnerabilities, misconfigurations and attacks.
Are there free container security tools?
Yes. Several widely used scanners and runtime tools are open source and free to run.
Is image scanning enough?
No. Scanning catches known issues before deployment, but runtime tools are needed to spot attacks and drift.
What is NIST SP 800-190?
It's NIST's Application Container Security Guide, published in 2017, explaining container security concerns and recommendations.
Do hardened base images help?
Yes. Starting from minimal, trusted images reduces the number of vulnerabilities you inherit.
Where should scanning happen?
In the build pipeline and the registry, so issues are caught before images are deployed, and again on a schedule, because new vulnerabilities are found in old images all the time.
