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Security report for prosopo.io

PROSOPO LIMITED (UK) · Technology · United Kingdom

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

70/100

Risk levelMedium

0–100, higher is better. How it is calculated

Prosopo Limited is a UK-based technology company specializing in advanced CAPTCHA and bot protection solutions. Their flagship product, Procaptcha, offers a dynamic, proof-of-work CAPTCHA system designed to provide superior bot defense while maintaining user privacy and GDPR compliance. Positioned as a cost-effective alternative to Google reCAPTCHA and hCaptcha, Prosopo targets businesses and website owners seeking robust security with minimal user friction. The company emphasizes ease of integration, customizable difficulty levels, and a privacy-first approach with no centralized data storage or user tracking. Technically, the website is built using modern web technologies including Eleventy static site generation, JavaScript libraries like PrismJS and Font Awesome, and is hosted with Cloudflare DNS services. The site demonstrates excellent mobile optimization, fast performance, and good SEO practices. Security measures include HTTPS enforcement and a Content Security Policy, though DNSSEC is not enabled. No critical vulnerabilities or exposed sensitive data were detected. From a security posture perspective, Prosopo shows strong adherence to best practices with encrypted communications and privacy compliance. However, the absence of a dedicated security policy or incident response page and lack of DNSSEC are areas for improvement. The company maintains a transparent pricing model and provides extensive documentation, customer testimonials, and trust signals enhancing business credibility. Overall, Prosopo presents a mature, professional, and trustworthy service in the cybersecurity space with a strong focus on privacy and user experience. Strategic recommendations include enabling DNSSEC, publishing a security policy, and adding a vulnerability disclosure mechanism to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
80/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

5 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  3. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

  4. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Weak SPF Policy

      SPF record has permissive policy allowing any server to send email

      What to do: Use -all or ~all qualifier for better email security

Need hands-on remediation? Email guard@offseq.com

Keep watching prosopo.io

This scan found 22 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
75
Security headers
30
Email security
75
DNS health
60
Network security
100
GDPR outside view
80
Average
70

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Prosopo operates in the competitive CAPTCHA and bot protection market, differentiating itself through privacy-first design and cost-effective pricing. Their SaaS model targets small to medium businesses and enterprises needing scalable bot defense. The company leverages partnerships and integrations with popular platforms like WordPress and Shopify to expand reach. Customer testimonials and Trustpilot reviews indicate positive market reception and effective bot mitigation. The transparent pricing calculator and free tier encourage adoption. Prosopo's growth potential is supported by increasing demand for GDPR-compliant security solutions and rising costs of incumbent CAPTCHA providers. The company maintains active community engagement via Discord, GitHub, and social media, fostering a supportive ecosystem.

Security posture

Prosopo demonstrates a solid security posture with HTTPS enforced and a Content Security Policy in place. The website does not expose sensitive data or use vulnerable libraries. Privacy compliance is strong, with no user tracking or centralized data storage. However, the lack of DNSSEC reduces DNS security, and no explicit security policy or incident response contact is published, which could hinder vulnerability reporting and incident management. The absence of a security.txt file limits transparency for security researchers. Overall, the security maturity is good but could be enhanced by adopting additional headers (HSTS, X-Frame-Options) and formalizing security policies.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Publish a comprehensive security policy and incident response page to enhance transparency and preparedness.
  3. Add a security.txt file to facilitate vulnerability disclosure and communication with security researchers.
  4. Implement additional HTTP security headers such as HSTS, X-Frame-Options, and X-Content-Type-Options.
  5. Consider providing direct contact emails or phone numbers for security and support inquiries to improve trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
PROSOPO LIMITED (UK)
Description
Security-focused, dynamic, PoW CAPTCHA solution designed to protect against bots and automation threats. Switch from reCAPTCHA in minutes.
Key services
GDPR Compliant CAPTCHA, Invisible CAPTCHA, Access Control, Risk Scoring, API Protection, Spam Filter
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, PrismJS, Font Awesome, Google Fonts, Cloudflare DNS
Frameworks
Eleventy (static site generator)
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy present
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

Services
Plausible Analytics
Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
plausible.io
Marketing tools
Plausible Analytics
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges
  2. Content is comprehensive and professionally presented
  3. Strong focus on privacy and GDPR compliance
  4. Multiple customer testimonials and trust signals present
  5. Pricing and plans clearly detailed
  6. No direct contact emails or phone numbers publicly listed, only contact form
  7. No explicit security policy or incident response page found
  8. Modern tech stack with good performance and mobile optimization
  9. No DNSSEC enabled which is a minor security gap
Technical notes

Notes

The website is built using a modern static site generator (Eleventy) with a clean and performant front-end leveraging JavaScript libraries like PrismJS and Font Awesome. Hosting and DNS are managed via Cloudflare, providing reliable performance and security features. The site is mobile-optimized, accessible, and SEO-friendly with proper meta tags and Open Graph data. No CMS is detected, reducing attack surface. The use of Plausible Analytics indicates a privacy-conscious approach to user tracking. Overall, the technical infrastructure is robust, modern, and well-maintained, supporting the business goals effectively.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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