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Security report for quillbot.com

QuillBot · Technology · United States

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

Security score

77/100

Risk levelLow

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

QuillBot is a technology company specializing in AI-powered writing assistance tools, including paraphrasing, grammar checking, citation generation, summarization, and translation. Established in 2017, it targets students, professionals, and writers seeking to improve their writing quality. The company operates a modern web platform with extensions for popular browsers, positioning itself as a leading AI writing solution in the education and professional sectors. Technically, QuillBot employs a robust React-based frontend, leverages cloud services such as Firebase, and integrates multiple third-party analytics and monitoring tools, reflecting a mature and scalable digital infrastructure. Security-wise, the website enforces HTTPS, employs standard security headers, and uses reputable third-party security services, although it lacks a public security policy or vulnerability disclosure program. Overall, QuillBot demonstrates a strong security posture with room for improvement in transparency and DNS security. The website is professionally designed, mobile-optimized, and compliant with privacy regulations, making it trustworthy and user-friendly.

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

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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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

      Unregistered MX Record

      MX record points to unregistered domain: c3f7p623wympm3lnqu7dnsu4hn75nyd3ydiusicm6mjtrfyhndqq.verification.google.com

      What to do: Remove or fix MX record pointing to unregistered domain

      • RFC 5321 §5.1
      • NIS2 21(2)(i)
      • IR 2024/2690 12.4: Implementing Regulation (EU) 2024/2690, Annex point 12.4: Asset inventory
      • NIST CM-8: NIST SP 800-53 Rev. 5 CM-8: System Component Inventory

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

Keep watching quillbot.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

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

Billed monthly to your card. Cancel anytime. The full timeline opens with your unlock code.

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
55
Email security
87
DNS health
75
Network security
100
GDPR outside view
68
Average
77

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

QuillBot's market positioning is strong within the AI writing assistant niche, leveraging a freemium SaaS model with subscription upgrades. Its competitive advantage lies in comprehensive writing tools integrated into a single platform, supported by browser extensions and cloud infrastructure. Revenue streams likely include subscription fees and affiliate partnerships. The target customer segments are primarily students and professionals requiring writing enhancement. Growth indicators include continuous product updates and integrations with citation and plagiarism services. The partnership ecosystem includes payment processors like Stripe and educational service providers like Scribbr. Strategic observations highlight a focus on user experience, privacy compliance, and leveraging analytics for product improvement.

Security posture

QuillBot exhibits a mature security posture with HTTPS enforcement, modern security headers, and use of monitoring tools like Sentry and Datadog. No critical vulnerabilities or exposed sensitive data were detected in the website content. However, the absence of a public security policy, incident response contacts, and vulnerability disclosure program represents a compliance gap. DNSSEC is not enabled, which could be improved to enhance DNS security. The company demonstrates awareness of privacy regulations with GDPR-compliant policies and cookie consent mechanisms. Incident response readiness and security culture indicators are not publicly documented, suggesting an area for enhancement.

Recommendations

  1. Enable DNSSEC to strengthen DNS security and prevent spoofing.
  2. Publish a dedicated security policy and incident response contact information on the website.
  3. Implement and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Enhance transparency around data retention policies and user privacy practices.
  5. Regularly audit third-party libraries and dependencies to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
QuillBot
Description
QuillBot provides AI-powered writing and paraphrasing tools designed to improve writing quality, grammar, and style for students, professionals, and writers.
Key services
Paraphrasing, Grammar checking, Citation generation, Summarization, Translation
Content quality
excellent
Branding
consistent

Technology

Stack
React 17, SystemJS, TinyMCE, Cloudflare DNS, Firebase, Stripe, Sentry, Datadog, Amplitude
Frameworks
React
Platforms
Web, Chrome Extension, Edge Extension, Safari Extension
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No DNSSEC (not enabled)
  • Use of reputable third-party security services (Sentry, Datadog)

Analytics and tracking

Services
Amplitude, Datadog, Google Analytics (UA-108482885-1), Google Tag Manager (GTM-MJ377JJ)
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Amplitude, Datadog, Sentry, Customer.io, Klaviyo
Marketing tools
Klaviyo, Friendbuy
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. Comprehensive privacy and cookie policies with consent mechanisms are present.
  3. No direct company emails or phone numbers found in the HTML; contact is via form.
  4. Modern tech stack with React and various third-party integrations.
  5. Strong security posture with HTTPS and security headers.
  6. No evidence of vulnerability disclosure or security.txt file.
  7. Business is focused on AI writing tools for education and professional use.
  8. No adult or questionable content detected.
  9. Good use of analytics and marketing tools with privacy compliance.
Technical notes

Notes

The website is built on a modern React framework with SystemJS module loading, ensuring modular and maintainable code. It uses TinyMCE for rich text editing and integrates multiple cloud services including Firebase for backend and storage, Stripe for payments, and Sentry for error monitoring. Performance is optimized with preloaded fonts and assets, and the site is mobile-responsive with good accessibility features. The use of CDN and Cloudflare DNS contributes to fast content delivery. Technical risks are minimal but include the lack of DNSSEC and potential dependency on multiple third-party services which require ongoing security management.
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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