Cloud · head to head
Kustomize vs OWASP ZAP
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: Kustomize no packaging or distribution story, which is exactly what Helm charts provide; 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: Kustomize covers Overlay patching, OWASP ZAP covers Intercepting proxy.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Kustomize 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 Kustomize
- Overlay patching
- No templating language
- Built into kubectl
- Generators
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.
Kustomize
- Managing dev, staging and production variants of the same manifestsnot OWASP ZAP
- Keeping manifests readable and directly applyable rather than templatednot OWASP ZAP
- Patching third-party manifests without forking themnot 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 Kustomize
- Manual penetration testing that needs an intercepting proxy, request replay and fuzzing without a paid licence per testernot Kustomize
- Teaching developers what an attack against their own endpoint looks like, using a tool they can install themselvesnot Kustomize
- Pre-release regression scanning of an internal application that would never justify a commercial DAST subscriptionnot Kustomize
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Kustomize
- No packaging or distribution story, which is exactly what Helm charts provide
- Deeply nested overlays become hard to follow, and reasoning about the final output requires building it
- No release lifecycle: nothing tracks what is installed or supports rollback the way Helm does
- Patch syntax is fiddly for anything beyond simple field replacement
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
Kustomize
Free- KustomizeFree
- Full functionality
- No usage limits
- Community support
OWASP ZAP
Free- Free & Open SourceFree
- Full functionality
- Active & passive scanning
- Spider
Which should you pick?
Choose Kustomize if
- You need overlay patching.
- You want to start without paying.
- You work on Kubernetes, Linux, macOS, Windows.
- You also want no templating language.
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 Kustomize or OWASP ZAP better?
- Neither clearly leads. Kustomize 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, Kustomize or OWASP ZAP?
- Kustomize starts at Free and OWASP ZAP at Free.
- Does Kustomize or OWASP ZAP run on more platforms?
- Kustomize runs on Kubernetes, Linux, macOS, Windows. OWASP ZAP runs on Desktop, Cli, Api.
- Can I use Kustomize for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Kustomize best used for?
- Kustomize is most often used for managing dev, staging and production variants of the same manifests, keeping manifests readable and directly applyable rather than templated, patching third-party manifests without forking them. Of those, managing dev, staging and production variants of the same manifests and keeping manifests readable and directly applyable rather than templated are not what OWASP ZAP is typically brought in for.
- What can Kustomize do that OWASP ZAP cannot?
- Kustomize covers Overlay patching, No templating language, Built into kubectl, Generators. OWASP ZAP covers Intercepting proxy, Passive scanner, Active scanner, AJAX spider.
Answered from the vendors’ own pages
Kustomize: Is Kustomize free?
Yes, open source and part of the Kubernetes project.
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.
Kustomize: Kustomize or Helm?
Kustomize patches plain YAML and keeps bases readable; Helm templates and packages applications with a release lifecycle. Many teams use both — Helm to install third-party charts, Kustomize to patch them.
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.
Kustomize: Do I need to install Kustomize?
No. It is built into kubectl, available through kubectl apply -k.
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.
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.
Related pages
Other head to heads
- Kustomize vs Portworx
- Kustomize vs Podman
- Kustomize vs Rancher
- Kustomize vs DigitalOcean
- Kustomize vs Pulumi
- Kustomize vs Caddy
- Kustomize vs Packer
- Kustomize vs Porter
- Kustomize vs Crossplane
- Kustomize vs IBM Cloud
- Kustomize vs Koyeb
- Kustomize vs Microsoft Azure
- Kustomize vs Nitric
- Kustomize vs OpenEBS
- Kustomize vs Buildah
- Kustomize vs K3s
- Kustomize vs Vagrant
- Kustomize vs Nomad
- Kustomize vs 1Password
- Kustomize vs Bitdefender Total Security
- Kustomize vs Norton 360
- Kustomize vs LastPass
- Kustomize vs Bitwarden
- Kustomize vs Burp Suite
- Kustomize vs Metasploit
- Kustomize vs Wireshark
- Kustomize vs authentik
- Kustomize vs Authelia
- Kustomize vs Infisical
- Kustomize vs Trivy
- Kustomize vs Feedzai
- Kustomize vs Frontegg
- Kustomize vs HashiCorp Boundary
- Kustomize vs JumpCloud
- Kustomize vs McAfee Total Protection
- OWASP ZAP vs Portworx
- OWASP ZAP vs Podman
- OWASP ZAP vs Rancher
- OWASP ZAP vs DigitalOcean
- OWASP ZAP vs Pulumi
- OWASP ZAP vs Caddy
- OWASP ZAP vs Packer
- OWASP ZAP vs Porter
- OWASP ZAP vs Crossplane
- OWASP ZAP vs IBM Cloud
- OWASP ZAP vs Koyeb
- OWASP ZAP vs Microsoft Azure
- OWASP ZAP vs Nitric
- OWASP ZAP vs OpenEBS
- OWASP ZAP vs Buildah
- OWASP ZAP vs K3s
- OWASP ZAP vs Vagrant
- OWASP ZAP vs Nomad
- OWASP ZAP vs 1Password
- OWASP ZAP vs Bitdefender Total Security
- OWASP ZAP vs Norton 360
- OWASP ZAP vs LastPass
- OWASP ZAP vs Bitwarden
- OWASP ZAP vs Burp Suite
- OWASP ZAP vs Metasploit
- OWASP ZAP vs Wireshark
- OWASP ZAP vs authentik
- OWASP ZAP vs Authelia
- OWASP ZAP vs Infisical
- OWASP ZAP vs Trivy
- OWASP ZAP vs Feedzai
- OWASP ZAP vs Frontegg
- OWASP ZAP vs HashiCorp Boundary
- OWASP ZAP vs JumpCloud
- OWASP ZAP vs McAfee Total Protection