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Security report for antithesis.com

Antithesis Operations LLC · Technology · United States

Low risk. 2 critical or high findings in Security headers and GDPR outside view.

Security score

82/100

Risk levelLow

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

Antithesis Operations LLC operates a sophisticated autonomous software testing platform designed to identify and reproduce bugs in complex distributed systems, with a focus on fintech, blockchain, databases, and cloud infrastructure sectors. The company positions itself as an innovative leader in autonomous testing, providing deterministic simulation testing that enhances software reliability and reduces time-to-resolution for critical bugs. Their website reflects a mature, professional business with strong trust signals including customer testimonials and SOC 2 Type 2 certification. Technically, the website employs modern JavaScript frameworks, analytics tools such as PostHog and HubSpot, and is hosted with Amazon Registrar, indicating a robust digital infrastructure. The site is well-optimized for mobile devices, has good SEO practices, and offers a seamless user experience. However, there is room for improvement in DNS security and cookie consent mechanisms. From a security perspective, the company demonstrates good practices with HTTPS enforcement, domain status protections, and a dedicated security manifesto page. The absence of DNSSEC and explicit security headers, as well as lack of a vulnerability disclosure policy, represent minor gaps. The contact form is well-validated and includes anti-bot measures, enhancing security posture. Overall, Antithesis presents a low-risk profile with a strong business and technical foundation. Strategic improvements in DNS security, privacy compliance, and vulnerability disclosure would further enhance their security maturity and trustworthiness.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 100 · Medium
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

2 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 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 Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

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

Keep watching antithesis.com

This scan found 15 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

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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
90
Security headers
65
Email security
85
DNS health
85
Network security
100
GDPR outside view
68
Average
82

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

Antithesis targets high-value sectors such as fintech and blockchain, where software reliability is critical. Their autonomous testing platform addresses a niche need for deterministic bug detection in complex distributed systems, offering a competitive advantage over traditional testing methods. The business model is B2B SaaS, focusing on software engineering teams seeking to reduce outages and accelerate release cycles. The company leverages partnerships and integrations with marketing and analytics platforms to drive growth and customer engagement. Testimonials from notable clients and case studies reinforce market credibility. The company operates from the US and UK, indicating a transatlantic presence with a small but focused team. The mature domain age supports a stable market presence.

Security posture

Antithesis exhibits a mature security posture with HTTPS enforced and domain registration protections in place. The presence of a security manifesto and SOC 2 Type 2 certification indicates commitment to security standards. However, the lack of DNSSEC and missing HTTP security headers suggest areas for enhancement. The contact form includes robust validation and bot detection, reducing risk of spam or injection attacks. No explicit incident response or vulnerability disclosure pages were found, which could limit transparency and responsiveness to security issues. The use of multiple third-party analytics and marketing scripts introduces a moderate tracking footprint, necessitating careful privacy management. Overall, the security posture is good but could benefit from formalized disclosure and DNS security improvements.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS integrity and prevent spoofing.
  2. Implement comprehensive HTTP security headers such as Content Security Policy, HSTS, and X-Frame-Options.
  3. Add a publicly accessible vulnerability disclosure policy or security.txt file to enhance transparency.
  4. Introduce a cookie consent banner/mechanism to comply fully with GDPR and other privacy regulations.
  5. Regularly audit third-party scripts and tracking tools to minimize privacy risks and improve user trust.

Contact details published on the site

Addresses
Legal name
Antithesis Operations LLC
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Antithesis Operations LLC
Description
Antithesis is an autonomous testing platform that finds bugs in software with perfect reproducibility to help fix them. It targets critical systems in fintech, blockchain, databases, and cloud infrastructure sectors.
Key services
Autonomous software testing platform, Deterministic simulation testing, Bug detection with perfect reproducibility
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, PostHog analytics, HubSpot, Google Tag Manager, Zapier, SVG graphics, CSS variables and media queries
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • ClientDeleteProhibited, clientTransferProhibited, clientUpdateProhibited domain statuses
  • No DNSSEC enabled (potential improvement area)
  • Secure contact form with validation and bot detection
  • SOC 2 Type 2 certification indicated

Analytics and tracking

Services
PostHog, HubSpot, Google Tag Manager
Tracking level
extensive
Privacy practices
basic

Advertising

Ad networks
Twitter Ads, LinkedIn Ads
Tracking pixels
PostHog, HubSpot, LinkedIn Insight Tag, Twitter Universal Website Tag
Marketing tools
HubSpot, Zapier
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed with clear navigation and responsive layout.
  2. Strong focus on autonomous software testing for critical systems.
  3. Multiple customer testimonials and case studies enhance trust.
  4. Use of modern analytics and marketing tools indicates digital maturity.
  5. Contact form includes validation and anti-bot measures.
  6. No phone numbers explicitly listed for contact.
  7. No explicit cookie consent banner found despite tracking scripts.
  8. Security policy page present but no explicit incident response or vulnerability disclosure pages.
  9. SOC 2 Type 2 certification prominently displayed as trust indicator.
Technical notes

Notes

The website is built with modern web technologies including advanced CSS with variables and media queries, SVG graphics for logos and icons, and JavaScript for interactivity and analytics integration. It uses PostHog for analytics, HubSpot for marketing automation, and Google Tag Manager for tag management. Hosting appears to be on AWS infrastructure, providing scalability and reliability. The site is mobile-optimized with responsive design and accessibility considerations. Performance is fast with preloading of fonts and deferred script loading. The contact form is integrated with Zapier for backend processing and includes client-side validation and anti-bot honeypot fields. Opportunities exist to improve DNS security and implement additional security headers to reduce technical risk.
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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