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Security report for addtocalendar.com

AddToCalendar · Technology · N/a

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

64/100

Risk levelMedium

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

AddToCalendar.com is a specialized technology service offering a free widget that enables users to add events to various calendar platforms such as Google Calendar, Outlook, iCal, and Yahoo. The service targets web developers, event organizers, and marketers, providing easy integration for event pages and email campaigns. The website is well-structured, with clear instructions and multiple style options for the widget, and is trusted by notable clients like Dell and Adidas. Technically, the site leverages modern web technologies including Bootstrap, JavaScript, and is hosted on Amazon Web Services, ensuring good performance and mobile optimization. Security-wise, the site enforces HTTPS and uses asynchronous JavaScript loading, but lacks advanced security headers and published security policies. Privacy compliance is weak due to the absence of privacy and cookie policies. Overall, the domain registration is consistent and legitimate, supporting the business credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

7 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 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 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 addtocalendar.com

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

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  • 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
67
Security headers
15
Email security
65
DNS health
85
Network security
100
GDPR outside view
53
Average
64

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention addtocalendar.com, from OffSeq Breach.

No leaked records found

Breach holds no records for addtocalendar.com right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Technical appendix

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

Business context

Business profile

The business operates in the technology sector, focusing on event management tools and calendar integration. Its free widget model likely supports widespread adoption and integration with email marketing platforms such as MailChimp and Salesforce. The company has established a solid market position with over 20,000 IT companies and organizations using its service. The business model appears to be freemium or service-based, with potential for customization and integration offerings. The lack of detailed company information and physical contact details suggests a small-sized operation. The partnership ecosystem includes major cloud providers and social media platforms for analytics and tracking.

Security posture

The website demonstrates a moderate security posture with HTTPS enabled and no visible exposure of sensitive data. However, it lacks critical security headers such as Content-Security-Policy and X-Frame-Options, which could mitigate common web attacks. There is no published incident response or vulnerability disclosure policy, which limits transparency and preparedness. The use of third-party analytics and tracking scripts introduces moderate privacy risks. The absence of privacy and cookie policies is a compliance gap, especially under GDPR. Overall, the security maturity is adequate for a small web service but requires improvements to meet higher compliance and security standards.

Recommendations

  1. Publish comprehensive privacy and cookie policies to improve GDPR compliance and user trust.
  2. Implement and enforce security headers like Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Add a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  4. Consider publishing an incident response plan or security policy to enhance transparency.
  5. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
AddToCalendar
Description
Provides a free 'Add to Calendar' button widget for event pages and email campaigns, supporting multiple calendar platforms including Google Calendar, Outlook, iCal, and Yahoo. Enables event RSVP and integration with email marketing tools.
Key services
Add to Calendar button widget, Event RSVP support, Calendar integration links, Email campaign compatibility
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, CSS, Bootstrap, Google Analytics, Facebook SDK
Frameworks
Bootstrap
Platforms
Web
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Client-side async JS loading
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Facebook Pixel
Tracking level
moderate
Privacy practices
poor

Advertising

Tracking pixels
Facebook Pixel
Marketing tools
Facebook SDK
Transparency
basic

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
moderate

Key observations

  1. Website provides a specialized free widget service for adding calendar events.
  2. Content is well structured with clear instructions and examples.
  3. No privacy or cookie policies found, which is a compliance gap.
  4. Uses modern web technologies and is hosted on AWS.
  5. Includes Google Analytics and Facebook Pixel for tracking.
  6. No contact phone numbers or physical addresses found.
  7. No explicit security or incident response policies published.
  8. Domain registration is stable and consistent with business claims.
Technical notes

Notes

The website uses a modern and lightweight technical stack including Bootstrap for responsive design and asynchronous JavaScript for widget loading, ensuring fast performance. Hosting on AWS provides scalability and reliability. The site integrates Google Analytics and Facebook Pixel for user behavior tracking. The HTML is well-structured with proper meta tags for SEO. However, accessibility features are basic and could be enhanced. The site lacks CMS indications, suggesting a custom or static site approach. There is an opportunity to improve technical security configurations and privacy compliance to reduce risk and improve user confidence.
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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