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HTTP Observatory VS SiteScanAPI

Compare HTTP Observatory VS SiteScanAPI and see what are their differences

HTTP Observatory

Developed by Mozilla, the HTTP Observatory performs an in-depth assessment of a site’s HTTP headers and other key security configurations.

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SiteScanAPI

Automate your security headers check with our website security scanner API. Instant header checker for HSTS, CSP, securityheader rules, and header security.

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Pricing
Free
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CloudGPU.app
GPU rental by the minute plus an OpenAI-compatible AI API, on one prepaid balance. Independent service. sponsored

Which is more popular?

Web Application Security popularity
100% vs 0%
alternatives listed
65 vs 16

Base details

Website, pricing, platforms and company facts side by side.

HTTP Observatory
SiteScanAPI
Website developer.mozilla.org sitescanapi.com
Pricing —
Free Official pricing
Platforms —
Web REST API SaaS Cloud +1
Listed in
Sales Automation Market Research Lead Management Web Application Security +1
Website Security Web Security Developer Tools APIs Vulnerability Scanners DevSecOps Monitoring Tools Website Monitoring Security & Privacy Cyber Security Vulnerability Scanner Web Application Security +9

About HTTP Observatory and SiteScanAPI

In their own words, as submitted to SaaSHub.

HTTP Observatory
SiteScanAPI

No description of HTTP Observatory yet.

SiteScanAPI is a fast, developer-first website security scanner and edge REST API engineered to audit defensive HTTP headers, DNS configurations, and perimeter security posture in under 250ms. Unlike heavy, intrusive vulnerability scanners that risk production downtime, SiteScanAPI performs 100%...

Read more about SiteScanAPI

Features and specs

What each product offers, as listed by its team.

HTTP Observatory 0 features
SiteScanAPI 5 features

No features have been listed yet.

  • Security headers audit
    Deterministic checks for HSTS preloading, CSP, X-Frame-Options, Referrer, and Permissions policies.
  • Developer REST API
    Zero-authentication JSON endpoint with <250ms edge latency for CI/CD pipelines and DevSecOps.
  • DNS & Email Security
    Real-time DNS-over-HTTPS (DoH) verification for RFC-compliant SPF and DMARC records.
  • Automated Fix Generation
    Ready-to-paste remediation snippets for Nginx, Apache, Caddy, and Cloudflare rules.
  • Origin Isolation & Leaks
    Verifies COOP/COEP isolation and detects server stack fingerprint leaks (Server, X-Powered-By).

Analysis

An editorial look at what each product does well and who it suits.

HTTP Observatory
SiteScanAPI

Overall verdict

  • HTTP Observatory by Mozilla (now hosted on MDN) is a free, reliable, and well-maintained security scanning tool that helps developers assess and improve the security posture of their websites through actionable, standards-based recommendations.

Why this product is good

  • It's completely free to use and backed by Mozilla, a trusted name in web standards and security
  • Provides a clear letter-grade score along with detailed, actionable feedback on HTTP security headers
  • Checks important security configurations like Content Security Policy (CSP), HSTS, X-Frame-Options, cookies, and more
  • Offers educational context and links to MDN documentation, helping developers understand the 'why' behind each recommendation
  • Continuously updated to reflect current web security best practices
  • Simple, straightforward interface that requires no signup or installation to run a basic scan

Recommended for

  • Web developers looking to harden the security of their sites
  • Security engineers performing quick baseline assessments of HTTP headers
  • Small teams or solo developers without a dedicated security budget
  • Educators and students learning about web security best practices
  • DevOps professionals integrating security checks into their workflows
  • Anyone wanting to validate their site's security headers against modern standards

No analysis of SiteScanAPI yet.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
HTTP Observatory
SiteScanAPI
100% 100%
Web Application Security
0% 0%
0% 0%
Web Security
100% 100%
100% 100%
Security
0% 0%
0% 0%
Monitoring Tools
100% 100%

Questions & Answers

As answered by people managing HTTP Observatory and SiteScanAPI.

What makes your product unique?

SiteScanAPI's answer:

SiteScanAPI bridges the gap between manual header checkers and complex, heavy vulnerability scanners. It is 100% passive, zero-auth, and runs entirely on global edge infrastructure (Cloudflare Workers) to deliver deterministic perimeter security audits in under 250 milliseconds.

Unlike traditional tools that only look at a handful of legacy HTTP headers, SiteScanAPI inspects the complete perimeter: • Comprehensive Headers: Strict-Transport-Security with preload validation, Content-Security-Policy (CSP), X-Frame-Options, and Referrer-Policy. • Next-Gen Origin Isolation: Verification of COOP, COEP, and CORP browser sandboxing boundaries. • DNS-over-HTTPS (DoH) Security: Real-time email authentication audits for RFC-compliant SPF and DMARC records. • Information Leak Detection: Stripping server banners (Server, X-Powered-By). • RFC 9116 Compliance: Verification of /.well-known/security.txt disclosure files. • Automated Remediation: Generates instant copy-paste configuration directives for Nginx, Apache, Caddy, Cloudflare, and modern frameworks.

Why should a person choose your product over its competitors?

SiteScanAPI's answer:

Most competing security scanners suffer from three major drawbacks: they are slow (waiting in multi-second queues), lack a developer REST API, or require cumbersome account signups with paywalled API keys.

Developers and security teams choose SiteScanAPI because: 1. Zero-Auth REST API: You can query https://sitescanapi.com/api/scan?url=yourdomain.com right from curl, CI/CD pipelines, or monitoring bots without API keys, tokens, or sign-up walls. 2. Edge Performance (<250ms): Audits complete almost instantly from the closest global edge node. 3. Non-Intrusive & Zero Downtime Risk: 100% passive HTTP and DNS interrogation ensures your firewalls aren't tripped and production uptime is never jeopardized. 4. Ready-to-Paste Fixes: Instead of just reporting warnings, SiteScanAPI produces exact server configuration snippets so you can fix failing grades in minutes.

How would you describe the primary audience of your product?

SiteScanAPI's answer:

The primary audience consists of: • Web Developers & Full-Stack Engineers: Who want to verify that production deployments enforce modern defensive headers like HSTS and CSP. • DevOps & DevSecOps Engineers: Who need a lightweight, zero-key REST API to gate release builds in GitHub Actions, GitLab CI, or deployment webhooks. • Security Analysts & Penetration Testers: Looking for instant, passive reconnaissance on target domains before conducting in-depth assessments. • Digital Agencies & Webmasters: Auditing client web applications for SSL/TLS, email spoofing (SPF/DMARC), and vulnerability disclosure compliance.

Which are the primary technologies used for building your product?

SiteScanAPI's answer:

SiteScanAPI is engineered for ultra-low latency, resilience, and minimal client overhead using: • Cloudflare Workers / Edge Runtime: Powers both the globally distributed scanning engine and the sub-250ms REST API. • Astro (v7): Delivers zero-JS editorial performance, rapid static rendering, and server-side edge rendering. • TypeScript: Type-safe RFC evaluation logic and deterministic scoring algorithms. • React 19: Powers the real-time interactive Scanner Dashboard island. • Tailwind CSS (v4): Custom editorial design system engineered for visual clarity and accessibility. • DNS-over-HTTPS (DoH): Cryptographic DNS queries for real-time SPF and DMARC email security validation.

What's the story behind your product?

SiteScanAPI's answer:

Over 60% of production websites fail basic defensive security audits—not because engineering teams don't care about security, but because perimeter configurations are fragmented across dozens of RFCs, W3C drafts, and server syntaxes.

Existing diagnostic tools were built a decade ago: they were clunky, loaded with ads, slow to respond, and lacked a simple API that could easily fail a build in modern CI/CD pipelines.

SiteScanAPI was built with a clear mission: to democratize perimeter web security. By leveraging modern edge computing, we made defensive security audits instant, deterministic, developer-first, and completely accessible to every engineer without friction or cost barriers.

Who are some of the biggest customers of your product?

SiteScanAPI's answer:

  • Independent SaaS Founders & Startups
  • Digital Web Agencies & Managed Service Providers
  • DevSecOps Teams Automating CI/CD Release Gates
  • Open-Source Project Maintainers
  • Cloudflare & Vercel Edge Application Developers
  • Cybersecurity Consultants & Penetration Testers

User comments

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