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Security report for dartpad.dev

Google LLC · Technology · United States

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

66/100

Risk levelMedium

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

DartPad is an official online Dart editor provided by Google LLC, designed to support Dart and Flutter app development directly in the browser. It serves developers by offering a free, accessible platform to write, compile, and run Dart code, including Flutter applications, without local setup. The website is positioned as a key tool within the Dart and Flutter ecosystems, targeting developers globally. Technically, the site leverages modern web technologies including Flutter Web, WebAssembly, and Trusted Types for security. It uses Google Fonts and Google Analytics for styling and analytics respectively, and is hosted on Google's infrastructure ensuring fast performance and high availability. The site is mobile-optimized and uses service workers for offline capabilities. From a security perspective, the site enforces HTTPS and employs Trusted Types policies to mitigate script injection risks. Service workers are versioned and managed securely. However, explicit security headers like Content-Security-Policy are not visible in the provided data, and no public security or incident response policies are found. Privacy compliance is basic, with a cookie consent mechanism present but no visible privacy or terms of service pages. Overall, DartPad is a high-quality, trustworthy developer tool with strong technical foundations and good security practices. The lack of explicit privacy and contact information slightly reduces compliance and user trust scores. Strategic improvements in privacy disclosures and security transparency would enhance the site's compliance and user confidence.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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

8 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 Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • 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

    • 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

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

Keep watching dartpad.dev

This scan found 20 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
77
Security headers
45
Email security
70
DNS health
70
Network security
100
GDPR outside view
35
Average
66

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

DartPad operates as a free developer tool under Google LLC, serving the technology sector with a focus on programming languages and frameworks. Its market position is strong as the official online Dart editor, integrated within the Flutter ecosystem. The business model is service-oriented, providing value to developers to encourage adoption of Dart and Flutter, indirectly supporting Google's broader platform strategy. Revenue is not directly generated from DartPad but likely supports ecosystem growth. Target customers are software developers, educators, and learners interested in Dart and Flutter. The platform benefits from Google's brand and infrastructure, ensuring scalability and reliability. Partnerships are implicit with Google services such as Google Fonts and Analytics. Growth indicators include continuous updates and integration with Flutter releases. The lack of direct monetization suggests a strategic tool rather than a revenue center.

Security posture

The website demonstrates a mature security posture with HTTPS enforced and use of Trusted Types to prevent script injection. Service workers are implemented with version control, enhancing security and performance. However, the absence of explicit security headers like Content-Security-Policy and lack of published security policies or vulnerability disclosure mechanisms indicate areas for improvement. No vulnerabilities or exposed sensitive data were detected in the analysis. Incident response readiness and security culture indicators are not publicly visible, limiting assessment. Compliance with GDPR is partial, with cookie consent implemented but no privacy policy found. The site would benefit from publishing clear security and privacy policies and providing security contact channels to improve transparency and user trust.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service to improve compliance and user trust.
  2. Implement and publish a security policy including vulnerability disclosure and incident response procedures.
  3. Add explicit security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  4. Provide clear contact information for security and general inquiries to enhance transparency.
  5. Enhance accessibility features to improve usability for all users.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Google LLC
Description
An online Dart editor with support for console and Flutter apps.
Key services
Online Dart code editing, Support for console and Flutter apps, Code compilation and execution in-browser
Content quality
good
Branding
consistent

Technology

Stack
Dart, Flutter, WebAssembly, CodeMirror, Google Fonts, Google Analytics, Trusted Types, Service Workers, Manifest.json
Frameworks
Flutter Web
Platforms
Web
Performance
fast
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of Trusted Types policy for script URLs
  • Service Worker registration with versioning
  • No inline scripts without nonce or Trusted Types
  • Use of Content Security Policy implied by Trusted Types usage

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

Transparency
basic

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
basic
Professionalism
good
Trustworthiness
high

Key observations

  1. Official Google product website for DartPad
  2. No privacy or terms of service pages found on the main page
  3. Cookie consent mechanism implemented via Google Glue cookie notification bar
  4. No contact emails or phone numbers publicly listed
  5. Modern web technologies and best practices used
  6. No forms or user data collection fields detected in the HTML
  7. No explicit security headers visible in provided data but Trusted Types and service workers indicate good security posture
Technical notes

Notes

DartPad is built on a modern technology stack including Flutter Web, WebAssembly, and CodeMirror for code editing. It uses Google Fonts and Google Analytics for styling and analytics. The site employs Trusted Types policies and service workers for security and performance. Hosting is on Google infrastructure, ensuring fast load times and reliability. The site is mobile-optimized and uses a manifest for progressive web app capabilities. No CMS detected, indicating a custom or static site architecture. Performance is fast with good technical implementation. Opportunities exist to improve SEO and accessibility compliance.
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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