Shieldome vs. OWASP ZAP vs. Mozilla Observatory vs. Detectify: Honest Comparison

If you are looking for a website security scanner, four names come up repeatedly: OWASP ZAP, Mozilla Observatory, Detectify, and Shieldome. They all scan websites for security issues — but they solve different problems, for different users, at very different price and complexity points. This article breaks them down honestly so you can pick the right tool for your situation.

The Short Version

• OWASP ZAP: Free and powerful, but requires installation, configuration, and security expertise to use effectively. Not realistic for most developers.
• Mozilla Observatory: Free and instant, but only checks HTTP security headers. Misses 80% of what matters.
• Detectify: Enterprise-grade SaaS with deep scanning. Excellent — but starts at €89/month with no free tier.
• Shieldome: SaaS like Detectify, but accessible: 1 free scan + 14-day trial, no install, results in under 5 minutes, plans from $20/month — built for developers not just security teams.

OWASP ZAP

What it is

OWASP ZAP (Zed Attack Proxy) is an open-source DAST (Dynamic Application Security Testing) tool maintained by the OWASP Foundation. It is the most widely known free web security scanner and has been the default recommendation in security courses and certifications for years.

Strengths

• Completely free and open source
• Deep, configurable scanning with hundreds of rules
• Proxy mode lets you intercept and inspect every request manually
• Active community, frequent updates
• CLI mode enables CI/CD integration (via the ZAP Docker image)

Weaknesses

• Requires installation: Java runtime + ZAP application download. On some platforms, setup alone takes 30–60 minutes.
• Steep learning curve: The UI is designed for security professionals. A developer seeing it for the first time will struggle to run a meaningful automated scan.
• Slow scans: A full active scan on a medium-complexity site takes 30–90 minutes. Passive scan is faster but significantly less thorough.
• Report quality: HTML/XML/JSON reports are comprehensive but require interpretation. No actionable remediation steps for developers.
• False positives: ZAP's active scanner is aggressive and generates false positives that require manual triage.
• No scan history or SaaS dashboard: Results live on your machine. No trend tracking, no shared team access.

Who ZAP is right for

Security professionals, penetration testers, and teams with a dedicated security engineer who can configure and maintain it. Not practical for developers who want quick feedback during development.

Mozilla Observatory

What it is

Mozilla Observatory (observatory.mozilla.org) is a free online tool that checks HTTP security headers and a small set of TLS properties. Enter a URL, get a letter grade.

Strengths

• Zero setup — paste a URL, get results in seconds
• Clear letter grade (A+ to F) that is easy to communicate to non-technical stakeholders
• Free with no registration required
• Good educational resource for understanding security headers

Weaknesses

• Headers only: Observatory checks roughly 10 HTTP response headers (CSP, HSTS, X-Frame-Options, etc.) and basic TLS. That is it.
• No injection testing: SQL injection, XSS, path traversal — not tested.
• No file exposure detection: A .env file accessible on your server will not be found.
• No authentication testing: Cookie flags, session security — not covered.
• No scan history: Each scan is stateless. No trend tracking.
• A+ grade ≠ secure site: An A+ score on Observatory means your headers are excellent. It says nothing about whether your application has SQL injection vulnerabilities, exposed backup files, or broken access control.

Who Observatory is right for

A quick headers check as one step in a broader security review. Not a substitute for a full vulnerability scan.

Detectify

What it is

Detectify is a commercial SaaS vulnerability scanner aimed at security teams at mid-market and enterprise companies. It combines automated scanning with a crowdsourced vulnerability database updated by ethical hackers.

Strengths

• Deep, continuously updated vulnerability coverage
• Subdomain monitoring and asset discovery
• Good integrations (Slack, Jira, PagerDuty, webhooks)
• Scheduled scanning and continuous monitoring
• Surface Monitoring for discovering unknown assets

Weaknesses

• No free tier: Detectify starts at €89/month. There is a 14-day trial.
• Enterprise pricing: Full-featured plans are significantly more expensive. Not accessible for freelancers, small teams, or developers testing personal projects.
• Onboarding friction: Domain verification required before scanning. Not instant.
• No performance checks: Detectify focuses on security only — no DNS timing, TTFB, HTTP/2, or page size metrics.

Who Detectify is right for

Security teams at companies with a security budget, looking for continuous monitoring and asset discovery. Overkill for most developers; unaffordable for freelancers and small businesses.

Shieldome

What it is

Shieldome is a SaaS web vulnerability scanner built for developers — not just security professionals. It covers the full OWASP Top 10 (2021) across 40+ controls, delivers results in 2–5 minutes, and requires no installation or domain verification to start.

Strengths

• No install: Enter a URL, get results. No Java, no Docker, no configuration.
• Full OWASP Top 10 (2021) coverage: SSL/TLS, security headers, sensitive file exposure (20+ paths), injection indicators, cookie security, server version disclosure, SRI, CORS, open redirects, SSRF indicators, and more.
• Fast: 2–5 minutes per scan. Practical for use after every deploy.
• PDF reports: Professional reports with severity ratings, findings, and remediation steps — suitable for sharing with clients, managers, and auditors.
• API + GitHub Actions: Full REST API and an embedded GitHub Actions workflow for CI/CD integration.
• Performance checks: DNS resolution time, TTFB, page size, compression, HTTP/2 — security and performance in one scan.
• Scan history: All scans stored. Track your security posture over time.
• Free tier: Free scan available, no credit card required.

Weaknesses

• Passive scanner — does not perform full active exploitation (by design: the goal is detection, not penetration testing)
• Does not perform asset discovery or subdomain enumeration (scan a specific URL you provide)
• No crowdsourced vulnerability database (like Detectify's ethical hacker program)

Who Shieldome is right for

Developers who want fast, actionable security feedback during development and after deployments. Small businesses, agencies, and freelancers who need professional scan reports without an enterprise budget. Teams who want to integrate security scanning into CI/CD without a dedicated security engineer.

Side-by-Side Comparison

Which Scanner Should You Use?

Use Mozilla Observatory if you want a 30-second check that your HTTP security headers are configured. Use it as a quick sanity check — not as your security strategy.

Use OWASP ZAP if you have a security professional on your team who can configure it, interpret the results, and maintain the installation. It is the most powerful free option, but its power comes with significant operational overhead.

Use Detectify if you are a larger organization with a security budget, looking for continuous monitoring and asset discovery across a large web property. The €89/month starting price is justified for teams that will use it fully.

Use Shieldome if you want fast, comprehensive, actionable security scanning without installation, configuration, or enterprise pricing. Shieldome is the right tool if any of the following describes you:

• You are a developer who wants security feedback after each deploy
• You need a professional PDF report for a client, audit, or insurance questionnaire
• You run a small business or agency and cannot justify €89/month per domain
• You want CI/CD integration without a dedicated security team to maintain it
• You want to know your OWASP Top 10 posture in under 5 minutes

Frequently Asked Questions

Can I use multiple scanners together?

Yes — they complement each other. A common workflow: run Shieldome for fast automated feedback on every deploy (OWASP Top 10, headers, files), and use ZAP manually for deeper investigation when a specific vulnerability needs further testing. Mozilla Observatory is useful as a quick visual check to share with non-technical stakeholders.

Is OWASP ZAP better than Shieldome because it is more established?

ZAP is more powerful for manual, expert-driven security testing. Shieldome is more practical for automated, developer-driven scanning. They solve different problems. ZAP's age does not make it a better fit for CI/CD integration or quick developer feedback — the operational overhead makes it impractical in those contexts.

Does Mozilla Observatory check for vulnerabilities?

No. Observatory checks whether specific HTTP response headers are present and correctly configured. It does not test for SQL injection, XSS, broken access control, exposed files, or any other application-layer vulnerability. An A+ Observatory score tells you your headers are correct — nothing more.

Is Detectify worth €89/month?

For security teams at companies running multiple web properties with continuous deployment, yes. For a developer with one or two sites, a freelancer, or a small business — the value-to-cost ratio is poor when free and affordable alternatives cover the core use case.

What does Shieldome check that OWASP ZAP misses?

Shieldome includes performance checks (DNS resolution time, TTFB, HTTP/2 support, compression, page weight) that ZAP does not cover. Shieldome also provides a hosted dashboard with scan history, team access, and PDF reports without any local setup. ZAP has deeper active scanning capabilities for expert users — it is a different tool for a different context.

Do I need to verify domain ownership to scan with Shieldome?

No. Enter any URL and scan immediately. Shieldome performs passive assessment — it does not require domain verification to start. This makes it practical for scanning client sites, staging environments, and URLs you are actively developing.

The best security scanner is the one you actually use regularly. Try Shieldome free — no install, no credit card, results in under 5 minutes.