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Security report for waifudeck.app

Waifu Deck · Technology

Low risk. 1 critical or high finding in Email security.

Security score

85/100

Risk levelLow

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

Waifu Deck is a small, niche technology project offering a free, open-source Android application designed for anime art collectors. The app enables users to swipe through curated image boards and save their favorite images locally on their devices, with optional encrypted cloud synchronization to user-owned storage. The business model emphasizes privacy, transparency, and user control, avoiding ads, tracking, and account requirements. The project is hosted openly on GitHub under the AGPL-3.0 license, reinforcing its commitment to openness and security. Technically, the website is well-constructed with modern HTML5, CSS3, and JavaScript technologies, including JSON-LD structured data for SEO and accessibility. The site is mobile-optimized, fast-loading, and provides a professional user experience. The app supports multiple cloud storage providers and uses strong encryption (AES-256-GCM) for data synchronization, ensuring user data confidentiality. Security posture is strong, with HTTPS enforced, no tracking or analytics scripts, and transparent open-source code. However, the site lacks explicit security headers and a cookie consent mechanism, which are recommended for enhanced security and compliance. The presence of a security policy and vulnerability disclosure via GitHub adds to the trustworthiness. Overall, Waifu Deck presents a low-risk profile with a strong focus on privacy and security, suitable for privacy-conscious users interested in anime art collection. Strategic recommendations include adding cookie consent, terms of service, and security headers to further improve compliance and security posture.

Scanned

NIS2 and GDPR posture

NIS2 outside view
60/ 100 · Medium
GDPR outside view
100/ 100 · Low
Checks completed
9of 9

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

The NIS2 figure counts only evidence anyone can see from the internet. 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

1 finding rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • High

      No DMARC record found

      There is no DMARC record at _dmarc.waifudeck.app, so receivers have no instruction for mail that fails SPF and DKIM.

      What to do: Publish a TXT record at _dmarc.waifudeck.app, starting with "v=DMARC1; p=none; rua=mailto:dmarc@waifudeck.app" and moving to p=quarantine or p=reject once reports look clean.

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

Keep watching waifudeck.app

This scan found 14 issues across 5 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
89
Security headers
53
Email security
72
DNS health
95
Network security
100
Website hygiene
85
GDPR outside view
100
Average
85

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.
  • Accessibility: Accessibility is a separate readout from security, so it is reported but not scored. 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 waifudeck.app, from OffSeq Breach.

No leaked records found

Breach holds no records for waifudeck.app 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

Waifu Deck occupies a niche market segment focused on anime art collectors using Android devices. Its competitive advantage lies in its open-source nature, privacy-first approach, and unique swipe-to-collect user interface. The business model is non-commercial, relying on community trust and transparency rather than monetization. The target audience includes anime enthusiasts valuing privacy and control over their collections. The project leverages partnerships with multiple image boards and cloud storage providers to enhance functionality. Growth indicators include active GitHub repository maintenance and community engagement through issue tracking and contribution guidelines. The ecosystem is tightly integrated with open-source tools and cloud services, positioning Waifu Deck as a trusted, privacy-respecting alternative to commercial apps.

Security posture

The security maturity of Waifu Deck is high for a small open-source project. Key strengths include enforced HTTPS, absence of tracking or analytics, encrypted data synchronization with AES-256-GCM, and open-source transparency allowing community review. The signed APK distribution with SHA-256 verification mitigates risks of tampering. Compliance with GDPR is supported by a comprehensive privacy policy and minimal data collection. Incident response is facilitated via GitHub security policy and a dedicated privacy email. However, the lack of explicit security headers and cookie consent mechanisms represent minor gaps. No vulnerabilities or exposed sensitive data were detected. Overall, the project demonstrates a strong security culture appropriate for its scale and audience.

Recommendations

  1. Implement and deploy HTTP security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance protection against common web attacks.
  2. Add a cookie policy and consent mechanism if any cookies are used, to improve privacy compliance and user transparency.
  3. Publish a clear terms of service document to define user rights and responsibilities, enhancing legal clarity.
  4. Consider adding a security.txt file at the root domain to facilitate vulnerability reporting and improve security communication.
  5. Maintain active monitoring of dependencies and update cryptographic libraries regularly to prevent vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Waifu Deck
Description
Waifu Deck is a free, open-source (AGPL-3.0) Android app for collecting anime art: swipe through 10 image boards and keep what you like in a library on your phone. No account, no ads, optional encrypted sync to storage you own.
Key services
Swipe-to-collect anime art app, Encrypted sync to user-owned cloud storage, Offline library management
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, Web Fonts (WOFF2), JSON-LD structured data, SVG icons
Platforms
Android (app platform)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • No ads or tracking scripts
  • No analytics or user tracking
  • Encrypted sync with AES-256-GCM
  • Open source code for transparency
  • Signed APK distribution with SHA-256 verification

Analytics and tracking

Tracking level
minimal
Privacy practices
excellent

Advertising

Transparency
excellent

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. Content is well-structured, professional, and focused on a niche open-source Android app.
  3. Strong emphasis on privacy and security with no ads or tracking.
  4. Open source code and signed APK distribution enhance trust.
  5. No cookie consent mechanism detected despite privacy policy presence.
  6. No terms of service document found.
  7. Contact information limited to a single privacy email address.
  8. No phone numbers or physical addresses found.
  9. No analytics or marketing tracking scripts detected.
  10. Multiple external links to reputable image boards and cloud providers.
Technical notes

Notes

The website is built with modern web standards including HTML5, CSS3, and JavaScript, with optimized assets such as WOFF2 fonts and SVG icons. It uses JSON-LD structured data to improve SEO and provide rich metadata about the software application and FAQ content. The site is mobile-responsive with excellent accessibility features such as focus-visible outlines and semantic HTML. Performance is optimized with preloading of fonts and lazy loading of images. The app supports multiple cloud storage backends with encrypted sync, demonstrating a robust technical architecture. No CMS or third-party analytics frameworks are detected, reducing attack surface. Hosting details are not explicit but the presence of Cloudflare R2 as a storage option suggests use of modern cloud infrastructure. Overall, the technical implementation is solid, modern, and well-suited for the app's purpose.
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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