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Security report for jspreadsheet.com

Jspreadsheet · Technology · N/a

Medium risk. 6 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

66/100

Risk levelMedium

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

Jspreadsheet is a technology company specializing in a JavaScript plugin that provides advanced spreadsheet and data grid controls for web applications. The company targets developers and businesses seeking Excel-like spreadsheet functionality embedded in their software. It holds a strong market position with usage by leading global companies and offers a professional product with extensions and framework integrations. The website demonstrates a mature technical infrastructure leveraging modern JavaScript frameworks, CDNs, and multiple analytics and marketing tools. The site is well-designed, mobile-optimized, and SEO-friendly, providing a rich user experience. Security posture is good with HTTPS and domain transfer protections, but lacks some advanced headers and published security policies. Privacy compliance is basic with cookie consent but no visible privacy policy. Overall, the risk is moderate with recommendations to enhance security headers and publish privacy and security policies to improve trust and compliance.

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

6 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 jspreadsheet.com

This scan found 25 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
77
Security headers
15
Email security
70
DNS health
80
Network security
100
GDPR outside view
53
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

Jspreadsheet operates in the technology sector providing a niche software product for front-end developers. Its business model includes offering a free trial and paid extensions, targeting professional developers and enterprises. The company benefits from a strong brand presence and endorsements by major corporations. Its partnership ecosystem includes related products like Intrasheets, Jsuites, and LemonadeJS, indicating a collaborative product suite. The company appears small but focused, with a domain age consistent with its market maturity. Revenue streams likely include licensing and support services. Growth indicators include active marketing and analytics integration. Strategic observations suggest opportunities to expand compliance transparency and security posture to enhance enterprise adoption.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and domain transfer protection. However, it lacks DNSSEC, Content-Security-Policy, and other security headers that are considered best practices. No explicit security or incident response policies are published, which may impact enterprise trust. No vulnerabilities or exposed sensitive data were detected in the HTML content. The use of reputable third-party analytics and marketing scripts is noted, but these increase the attack surface and require careful management. Compliance gaps exist regarding GDPR privacy policy publication and incident response readiness. Overall, the security posture is adequate for a small technology vendor but requires improvements for higher assurance levels.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Implement a comprehensive Content-Security-Policy header to mitigate cross-site scripting risks.
  3. Publish a detailed privacy policy and security policy on the website to improve compliance and transparency.
  4. Add a security.txt file to facilitate vulnerability disclosure and incident reporting.
  5. Include additional security headers such as X-Frame-Options and Referrer-Policy to harden the site.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Jspreadsheet
Description
Jspreadsheet is a JavaScript plugin that enables you to create rich online spreadsheets with features similar to Microsoft Excel and Google Sheets. It offers powerful data grid and datatable functionality for managing, sorting, filtering, and visualizing large amounts of data. It is suitable for payment calculators, inventory trackers, project management tools, and other spreadsheet needs.
Key services
JavaScript spreadsheet plugin, Data grid and datatable functionality, Extensions and integrations for various frameworks
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Material Icons, Google Fonts, jsuites, lemonadejs, highlightjs, Mixpanel, Bing Ads, Facebook Pixel, Google Tag Manager, Iubenda Cookie Solution, Zoho SalesIQ
Frameworks
LemonadeJS, Jsuites
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • No exposed sensitive data in HTML
  • Use of reputable third-party scripts

Analytics and tracking

Services
Microsoft Clarity, Mixpanel, Google Tag Manager
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
Bing Ads
Tracking pixels
Microsoft Clarity, Mixpanel, Facebook Pixel
Marketing tools
Iubenda Cookie Solution, Zoho SalesIQ
Transparency
basic

Site quality

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

Key observations

  1. Website is a professional JavaScript spreadsheet plugin provider.
  2. Content is rich and well-structured with extensive UI controls.
  3. No direct contact emails or phone numbers found on main site.
  4. Cookie consent is implemented via Iubenda.
  5. Multiple analytics and marketing scripts are used.
  6. No explicit privacy or security policies published.
  7. Domain registration is transparent and consistent.
  8. No WAF or blocking detected.
Technical notes

Notes

The website uses a modern and diverse technology stack including JavaScript frameworks (LemonadeJS, Jsuites), CDN hosting via AWS Cloudfront, and multiple analytics and marketing tools (Microsoft Clarity, Mixpanel, Facebook Pixel, Google Tag Manager). The HTML is well-structured with extensive use of meta tags, Open Graph, and JSON-LD structured data for SEO and social media integration. Performance is optimized with asynchronous script loading and preconnect hints. The site is mobile responsive and accessible with good navigation clarity. Technical risks include reliance on multiple third-party scripts which require ongoing security monitoring. There is no detected CMS, indicating a custom or static site architecture. Overall, the technical infrastructure is robust and modern with opportunities to improve security configurations.
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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