Cloud · head to head
K3s vs OWASP ZAP
K3s
Cloud
Lightweight certified Kubernetes distribution in a single binary
- From
- Free
- Rated
- -
OWASP ZAP
Cybersecurity
Free, open-source web application scanner and intercepting proxy, now governed by the Software Security Project.
- From
- Free
- Rated
- -
The short version
- Each has a real cost: K3s the SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity; OWASP ZAP authenticated scanning of modern single-page applications is the hard part and ZAP makes you build it by hand: session handling, token refresh and login scripts are configured per application, and a misconfigured session means the scanner logs itself out and reports a clean result for pages it never reached.
- They diverge on capability: K3s covers Single binary, OWASP ZAP covers Intercepting proxy.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which K3s and OWASP ZAP actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in K3s
- Single binary
- SQLite by default
- Certified conformant
- Batteries included
- Low resource footprint
- Simple install
Only in OWASP ZAP
- Intercepting proxy
- Passive scanner
- Active scanner
- AJAX spider
- Automation Framework
- Headless daemon and REST API
- Docker images
- Add-on marketplace
What people use each for
The jobs each tool is most often brought in to do.
K3s
- Kubernetes on edge sites and IoT hardware where full clusters will not fitnot OWASP ZAP
- Development and CI clusters that must start fast and cost nothingnot OWASP ZAP
- Small production clusters where full Kubernetes is more operations than the workload justifiesnot OWASP ZAP
- Teaching and learning Kubernetes without cloud spendnot OWASP ZAP
OWASP ZAP
- Adding a baseline security scan to every application's pipeline where per-target commercial licensing would limit coverage to a handfulnot K3s
- Manual penetration testing that needs an intercepting proxy, request replay and fuzzing without a paid licence per testernot K3s
- Teaching developers what an attack against their own endpoint looks like, using a tool they can install themselvesnot K3s
- Pre-release regression scanning of an internal application that would never justify a commercial DAST subscriptionnot K3s
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
K3s
- The SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity
- Bundled components such as Traefik are opinionated defaults that larger teams often strip out and replace
- Removed in-tree cloud provider integrations mean cloud-specific features need external controllers
- Aimed at small and edge clusters, so very large deployments are better served by a standard distribution
OWASP ZAP
- Authenticated scanning of modern single-page applications is the hard part and ZAP makes you build it by hand: session handling, token refresh and login scripts are configured per application, and a misconfigured session means the scanner logs itself out and reports a clean result for pages it never reached.
- There is no support contract in the product, so when a scan breaks the day before a release the escalation path is a GitHub issue and a community chat, which is not an answer that satisfies a delivery manager or an auditor who wants a named responsible party.
- Active scanning sends genuine attack traffic, so it can create records, trigger emails, exhaust rate limits or destabilise a fragile environment, and pointing it at production without prior agreement produces an incident rather than a test result.
- Output needs triage: passive rules generate large volumes of low-severity informational findings about headers and cookie flags that bury the few results that matter, and a team without someone tuning the rule set stops reading the report within a few sprints.
- As a dynamic scanner it can only test what it can reach, so authorisation flaws between accounts, business logic abuse and anything behind an undiscovered endpoint go unreported, and a passing ZAP scan is evidence of nothing more than the absence of the classes of bug it looks for.
Pricing, plan by plan
K3s
Free- K3sFree
- Full functionality
- No usage limits
- Community support
OWASP ZAP
Free- Free & Open SourceFree
- Full functionality
- Active & passive scanning
- Spider
Which should you pick?
Choose K3s if
- You need single binary.
- You want to start without paying.
- You work on Linux, ARM, Self-hosted.
- You also want sqlite by default.
Choose OWASP ZAP if
- You need intercepting proxy.
- You want to start without paying.
- You work on Desktop, Cli, Api.
- You also want passive scanner.
Questions people ask
- Is K3s or OWASP ZAP better?
- Neither clearly leads. K3s starts at Free and OWASP ZAP at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, K3s or OWASP ZAP?
- K3s starts at Free and OWASP ZAP at Free.
- Does K3s or OWASP ZAP run on more platforms?
- K3s runs on Linux, ARM, Self-hosted. OWASP ZAP runs on Desktop, Cli, Api.
- Can I use K3s for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is K3s best used for?
- K3s is most often used for kubernetes on edge sites and iot hardware where full clusters will not fit, development and ci clusters that must start fast and cost nothing, small production clusters where full kubernetes is more operations than the workload justifies, teaching and learning kubernetes without cloud spend. Of those, kubernetes on edge sites and iot hardware where full clusters will not fit and development and ci clusters that must start fast and cost nothing are not what OWASP ZAP is typically brought in for.
- What can K3s do that OWASP ZAP cannot?
- K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. OWASP ZAP covers Intercepting proxy, Passive scanner, Active scanner, AJAX spider.
Answered from the vendors’ own pages
K3s: Is K3s free?
Yes. K3s is open source with no licence fee. SUSE sells commercial support around Rancher separately.
OWASP ZAP: Is it still called OWASP ZAP?
The project left OWASP in August 2024 and is now governed by the Software Security Project, with core development sponsored by Checkmarx. The tool is now just ZAP, though most existing documentation, courses and search results still use the OWASP name.
K3s: Is K3s real Kubernetes?
Yes. It is CNCF-certified conformant, so standard manifests, kubectl and Helm charts work without modification.
OWASP ZAP: Is it free for commercial use?
Yes. It is Apache 2.0 licensed, with no per-application, per-scan or per-user cost, and it can be used and modified commercially without a licence agreement.
K3s: Why is K3s smaller than Kubernetes?
It strips legacy, alpha and in-tree cloud provider code, packages everything as one binary, and defaults to SQLite instead of etcd.
OWASP ZAP: Can it replace a penetration test?
No. It automates checks for known vulnerability classes against endpoints it can reach. It does not reason about business logic, chain findings into an attack, or test authorisation between accounts, which is most of what a tester actually does.
K3s: Can K3s run in production?
Yes, and it does, particularly at the edge and for small clusters. For a highly available control plane you need to move off the SQLite default to etcd or an external datastore.
OWASP ZAP: Does it run in CI?
Yes, through the official Docker images and the Automation Framework, which defines scan jobs in YAML so configuration lives in the repository. A baseline passive scan is the usual starting point because it is fast and non-intrusive.
OWASP ZAP: How does it compare to Burp Suite?
Burp Suite Professional is the more polished manual testing tool and has a stronger scanner and extension ecosystem, but it is licensed per tester and Burp Suite Enterprise per target. ZAP is the better fit where cost per target is the binding constraint; many teams use both.
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