Best Website Security Scanners in 2026: Troja vs OWASP ZAP vs Snyk vs Burp Suite

Four tools, four different jobs

"Best security scanner" is the wrong question — these tools do genuinely different things. Snyk scans your dependencies and code. Burp is a manual pentester's toolkit. ZAP is an open-source dynamic scanner. Troja is a fast, fix-oriented scanner built for developers shipping with AI tools. Here's how they actually compare, with no pretense that one replaces all the others.

The quick verdict

OWASP ZAP

The open-source Zed Attack Proxy is a respected DAST tool. It proxies traffic, spiders your site, and runs active/passive scans for injection, XSS, and misconfigurations.

• Strengths: free, powerful, scriptable, automatable in CI, no usage limits.
• Weaknesses: real setup and tuning required; noisy results need triage; no dependency or BaaS coverage; you interpret findings yourself.
• Use it if: you want a free, self-hosted dynamic scanner and have the time to configure it.

Snyk

Snyk is fundamentally different — it's SAST + SCA, not a black-box web scanner. It reads your code and dependency manifests to find vulnerable packages, insecure code patterns, container issues, and IaC misconfigs.

• Strengths: excellent dependency/CVE coverage, deep IDE and CI integration, fix PRs for vulnerable packages.
• Weaknesses: needs source/repo access; doesn't probe your running site the way an attacker does; won't catch a misconfigured RLS policy on your live database.
• Use it if: your priority is supply-chain and dependency risk inside the codebase.

Burp Suite

The professional pentester's standard. Burp is an intercepting proxy plus a deep toolkit (Repeater, Intruder, Scanner in Pro) for manual security testing.

• Strengths: unmatched depth and control for skilled testers; finds complex logic and chained vulnerabilities automated tools miss.
• Weaknesses: steep learning curve; largely manual; overkill for a solo dev who just wants to know if their app is safe to launch.
• Use it if: you're a security professional doing hands-on testing.

Troja

Troja is built for the developer who ships with Cursor, Claude, or Windsurf and wants a fast, actionable answer to "is my app safe and visible?"

• Strengths: point it at a URL — no install; 120+ security checks including BaaS misconfigurations (Supabase RLS, Firebase rules) that the others skip; every finding ships a paste-ready AI fix prompt; plus SEO (68 checks) and AEO (46 checks) in the same pass; MCP server so your AI agent can scan and fix in a loop.
• Weaknesses: it's a focused scanner, not a manual pentest framework like Burp, and not a code-level SCA like Snyk.
• Use it if: you want fast, prioritized, fix-first results for a modern (often AI-built) web app — and you care about whether AI engines can see you, not just whether attackers can.

How to choose

• Solo dev / indie SaaS shipping fast: Troja for the live-app + BaaS + fix-prompt workflow; add Snyk in CI for dependencies.
• Open-source-only budget: ZAP for DAST plus npm audit for dependencies.
• Security professional: Burp for manual testing, Snyk for SCA.
• Enterprise: realistically a combination — SCA in CI, DAST in staging, periodic manual pentests.

A pragmatic split many teams land on is one scanner per layer, wired into CI so nothing is manual:

# .github/workflows/security.yml — one tool per layer
jobs:
  deps:
    steps:
      - run: npx snyk test --severity-threshold=high   # supply chain
  liveapp:
    steps:
      - run: npx troja scan https://staging.example     # outside-in + BaaS + headers

Snyk reads the code; Troja attacks the running app and checks your Supabase/Firebase rules — together they cover the two layers a single tool can't.

These aren't mutually exclusive. The honest answer for most shipping developers is Troja for the fast outside-in pass and a dependency scanner in CI — and Burp only when you bring in a professional.

Build coverage by layer, not by logo

The four products belong to different testing layers. OWASP ZAP observes a running application through passive and active web scanning. Snyk analyzes source, open-source dependencies, containers and infrastructure definitions through its product family. Burp Suite combines an intercepting proxy with automated and manual testing tools for an operator who understands the application. Troja packages public and connected checks for a developer-oriented remediation workflow that also includes SEO and answer visibility.

That distinction explains why “which scanner found more?” is a poor benchmark. A dependency CVE has no equivalent in a header crawl; an object-level authorization failure may require two accounts and a manual request replay; a missing canonical tag is commercially important but not a vulnerability. Start with a threat inventory, then assign a tool and an owner to each layer.

A practical stack for a small SaaS team

Use software-composition analysis on every pull request and block exploitable high-risk dependency changes after triage. Run passive DAST against each staging deployment, reserving active rules for an authorized environment with seeded data. Run a public production check after release for CDN, DNS, header and crawl differences. Finally, schedule a human review of authentication, authorization, payments and administrative workflows.

For every automated finding, require four fields: evidence, affected asset, expected control and retest. Scores without those fields are triage hints. Also pin tool versions or record cloud scan dates; a rule-library update can change the score even when the application does not change.

Do not aim an active scanner at a third-party production system, and do not assume a free edition grants permission to test someone else's site. Configure ZAP context and authentication before judging authenticated coverage. Use Burp's manual depth only with an operator who can avoid destructive requests. Limit repository integrations to least privilege and expire test credentials after an engagement.

For most small teams, the answer is a combination: SCA/SAST for code and dependencies, DAST for deployed behavior, a connected configuration review, then manual business-logic testing. The OWASP guide for indie hackers helps prioritize those manual cases; the Next.js checklist translates them into framework controls.

Scan it with Troja

If you want to see what the outside-in, fix-first approach catches on your app — including the Supabase and Firebase misconfigs the other tools don't check — run a free Troja scan and get your threat count in about 30 seconds.