OWASP ZAP vs Checkmarx: Which Security Scanner Is Right for You?
OWASP ZAP is a free, open-source DAST tool. Checkmarx is a paid, enterprise SAST tool. They test different targets. So “which is better” is the wrong question. The real question is which surface you need to cover. One fact surprises most people. ZAP is not fully separate from Checkmarx anymore. Checkmarx now employs three of ZAP’s core maintainers. The project is now branded “ZAP by Checkmarx.” ZAP left OWASP back in September 2023. It joined the Linux Foundation instead. It stayed open source and free.
What is OWASP ZAP?
OWASP ZAP is the Zed Attack Proxy. It is a free, open-source DAST tool. The name stuck. But ZAP is not an OWASP project anymore. It tests your live app from the outside. That is the same view an attacker gets. ZAP sits as a proxy between your browser and your app. It catches the traffic. Then it runs scans against your live pages. It finds XSS and injection flaws. It finds login issues and broken access controls. It does this by probing the app while it runs.
ZAP takes real setup. You install it. You set up the proxy and point it at your app. Then you read the technical output. It fits a security engineer. They know how to run a proxy already. It does not fit a founder who wants a fast pre-launch check.
What is Checkmarx?
Checkmarx is a SAST and SCA platform for big teams. It reads your code without running it. It flags risky code and bad function calls. It flags CVEs in your packages too. It plugs into CI/CD. Findings get risk ratings, fix tips, and compliance notes. Pricing is high. It often runs $20,000 or more a year. You buy it through a sales team, not a quick checkout.
How do OWASP ZAP and Checkmarx compare?
| Area | OWASP ZAP | Checkmarx |
|---|---|---|
| Scan type | DAST — tests live running app | SAST + SCA — reads source code |
| Requires code access | No — live URL only | Yes — full source code |
| Requires running app | Yes — must be live | No — scans code offline |
| Price | Free (open source) | $20,000+/year (enterprise) |
| Skill level | High — proxy setup, reading results | High — CI/CD setup, developer training |
| Best for | Security engineers running manual DAST | Big teams with repo access and a security budget |
| AI-platform-aware | No | No |
What do both tools miss for AI-built apps?
Neither tool knows which AI platform built your code. They run the same rules either way. It does not matter where your app came from. Lovable, Bolt, Cursor, or a person typing by hand: the rules stay the same. That is a real gap. A Supabase RLS policy left off is a broken access control bug. OWASP’s 2021 Top 10 list ranks broken access control as the top risk. OWASP tested real apps. It found some form of it in 94% of them. Neither ZAP nor Checkmarx checks an AI-built app's live data rules. The same blind spot shows up in other places too. Bolt-built endpoints often miss rate limits. Windsurf's default ORM setup often creates N+1 query patterns.
ZAP and Checkmarx also skip reliability, performance, and monitoring. A clean Checkmarx scan can still ship with no error tracking. It can ship with no uptime checks. It can still ship with one bad query. That query can grind your database to a halt. That happens under real, live traffic.
Where does Launch Ready Code fit?
Launch Ready Code is a URL-based scanner, like ZAP. But it is built for founders, not engineers. It checks all four dimensions: security, reliability, performance, and monitoring. It detects which AI platform built your app. It returns results in 30 seconds with no setup. It is not a swap for Checkmarx in a big CI/CD pipeline. It is not a swap for ZAP in a formal pentest, either. It is the right tool for a fast pre-launch check. ZAP and Checkmarx are too complex for that job. Or they cost too much to run for it.
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Is OWASP ZAP as good as Checkmarx?
They test different surfaces, so “better” is the wrong frame. ZAP is DAST: it tests your live app from the outside. Checkmarx is SAST: it reads your source code. Neither replaces the other. ZAP is free and open source. Checkmarx backs it now. Checkmarx itself costs $20,000 or more a year. For most founders, neither is the right first step. Start with npm audit and a free URL-based scan instead.
Is Checkmarx worth the cost for small teams?
Checkmarx is built for large tech teams. They need a security budget and a CI/CD pipeline. They need developers who act on SAST findings at scale. For a small team, the cost and setup are hard to justify. Same for a solo founder. The one exception is a rule like SOC 2 or PCI DSS. Some of those rules call for Checkmarx-level SAST reports.
What is simpler than OWASP ZAP for pre-launch scanning?
Launch Ready Code scans your live URL in 30 seconds. You do not need proxy setup or special training. It covers security, including DAST-class checks. It also covers reliability, performance, and monitoring. The free scan returns a score right away.
Can OWASP ZAP detect Supabase RLS issues?
No. Supabase row-level security is a database setting. It is not an HTTP-layer bug. OWASP ZAP only works at the HTTP layer. It cannot see whether RLS is on or off for your Supabase tables. You need a URL-based scanner instead. It should test your API endpoints with and without login. It should know to check Supabase RLS patterns.
Research sources
- ZAP Core Team / Checkmarx — ZAP Ownership. Source for the ZAP and Checkmarx link cited above. Also covers the 2023 OWASP exit.
- OWASP Foundation — OWASP Top 10:2021, A01 Broken Access Control. Source for the 94% incidence-rate figure cited above.
- MITRE — CWE Top 25 Most Dangerous Software Weaknesses
- NIST National Vulnerability Database — NVD CVE severity ratings
- Jai Mittal, Founder & CTO, Launch Ready Code — Proprietary data from 700+ AI-built app security audits, 2025–2026. Average Launch Readiness Score: 44/100.