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Security report for heyflow.app

Heyflow GmbH · Technology · Germany

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

73/100

Risk levelMedium

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

Heyflow GmbH operates a sophisticated SaaS platform focused on converting website visitors into qualified leads through interactive, no-code funnels and landing pages. The company targets lead generation marketers and businesses seeking to optimize paid marketing campaigns with a comprehensive solution that includes over 50 integrations, analytics, and customization options. Their market position is solid, supported by thousands of customers and positive reviews on major platforms like G2 and Capterra. Technically, Heyflow leverages modern web technologies including Eleventy for static site generation, Cloudflare for DNS and CDN, and Matomo alongside Google Analytics for data insights. The website is fast, mobile-optimized, and SEO-friendly, reflecting a mature digital infrastructure. Security-wise, the site enforces HTTPS, employs clientTransferProhibited domain status, and integrates consent management via Usercentrics, although explicit security headers and a dedicated security policy page are absent. Overall, Heyflow demonstrates a strong security posture with room for improvement in transparency and incident response readiness. The business is credible, transparent, and compliant with GDPR, making it a trustworthy platform in the marketing technology space.

Scanned

NIS2 and GDPR posture

GDPR outside view
65/ 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 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

  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

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

Keep watching heyflow.app

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.

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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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Full report

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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
75
Security headers
30
Email security
85
DNS health
80
Network security
100
GDPR outside view
65
Average
73

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

Heyflow's business model centers on providing an all-in-one marketing funnel and landing page builder that reduces complexity and cost for marketers. Their competitive advantage lies in combining multiple tools into a single platform with extensive integrations and customization capabilities. Revenue streams likely include tiered subscription plans ranging from individual to enterprise levels. The target customer segments include B2B and B2C marketers, agencies, and enterprises across various industries such as solar, real estate, insurance, and financial services. Growth indicators include a large customer base, positive user reviews, and continuous product updates. The partnership ecosystem includes integrations with major platforms like Google, Meta, LinkedIn, and TikTok. Strategic observations highlight Heyflow's focus on ease of use, mobile-first design, and data-driven optimization to capture and convert leads effectively.

Security posture

Heyflow exhibits a mature security posture with mandatory HTTPS, domain transfer protection, and GDPR-compliant consent management. The platform incorporates lead validation features such as phone number verification and SMS OTP to ensure data quality. However, the absence of a publicly accessible security policy and incident response contacts indicates gaps in transparency and preparedness. No vulnerabilities or exposed sensitive data were detected in the analysis. The use of reputable third-party services and modern web standards further strengthens security. Compliance with GDPR is evident, but additional certifications or formal frameworks like ISO 27001 are not disclosed. Overall, Heyflow maintains a secure environment suitable for handling marketing data, with recommendations to enhance policy disclosures and incident readiness.

Recommendations

  1. Publish explicit security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to enhance browser security.
  2. Create and publicly share a dedicated security policy page outlining security practices and controls.
  3. Provide clear incident response contact channels, including security@ or abuse@ email addresses.
  4. Regularly audit and update third-party scripts and dependencies to mitigate potential vulnerabilities.
  5. Enhance transparency on data retention policies and user data handling to strengthen privacy compliance.

Contact details published on the site

Addresses
Legal name
Heyflow GmbH
VAT number
DE328081264
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Heyflow GmbH
Description
Create interactive lead funnels, multi-step forms and customized landing pages that drive conversions and engage your website visitors—without writing any code.
Key services
No-code funnel builder, Interactive landing pages, Lead qualification, 50+ integrations, Analytics and A/B testing, Custom emails and follow-ups, Built-in payments and bookings
Content quality
excellent
Branding
consistent

Technology

Stack
Eleventy static site generator, Cloudflare DNS and CDN, Matomo analytics, Google Tag Manager, Usercentrics consent management, Intercom chat widget, Flickity carousel, Custom fonts (APK Protocol)
Frameworks
Eleventy
Platforms
Cloudflare, Netlify (implied by .netlify/functions in URLs)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • Consent management implemented
  • Lead validation features (phone validation, SMS OTP)

Analytics and tracking

Services
Matomo, Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads
Tracking pixels
Matomo, Facebook Pixel (implied by Meta integration)
Marketing tools
Intercom, Usercentrics
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 and well-structured.
  2. Strong focus on lead generation and marketing funnel solutions.
  3. Good use of modern web technologies and analytics.
  4. Comprehensive privacy and cookie policies with consent management.
  5. No signs of malicious or suspicious content.
  6. Clear business identity and contact information.
  7. Use of multiple trusted third-party services for analytics and marketing.
Technical notes

Notes

The website is built using Eleventy, a modern static site generator, ensuring fast and efficient content delivery. Hosting appears to be on Netlify with Cloudflare providing DNS and CDN services, contributing to excellent performance and uptime. The tech stack includes Matomo and Google Analytics for analytics, Usercentrics for consent management, and Intercom for customer engagement. The site is mobile-optimized with responsive design and accessibility features. SEO is well-implemented with proper meta tags, Open Graph, and JSON-LD structured data. The use of modern fonts and CSS variables indicates a contemporary front-end approach. No technical debt or legacy technologies were detected, positioning Heyflow well for scalability and maintainability.
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

Earlier scans of this domain

  1. 84/100Low19 findingsView report
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