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Security report for onelink.to

OLTO AB · Technology · Sweden

Low risk. 3 critical or high findings in Security headers and SSL/TLS.

Security score

79/100

Risk levelLow

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

Onelink.to is a mature and reputable technology company specializing in smart app download links and QR codes that simplify app distribution across multiple platforms. Founded in 2011 and based in Stockholm, Sweden, it serves a global audience of app developers and marketers with a SaaS model offering free and paid subscription plans. The website demonstrates a high level of digital maturity with modern technologies, responsive design, and comprehensive multilingual content. Security posture is strong with HTTPS, security headers, and no visible vulnerabilities, though there is room to enhance transparency with dedicated security policies and incident response information. Overall, the company presents a trustworthy and professional online presence with robust analytics and marketing tools integrated.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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

3 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 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. 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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1
    • High

      Weak SSL Key Length

      SSL certificate uses 384-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 onelink.to

This scan found 17 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
52
Security headers
65
Email security
85
DNS health
90
Network security
100
GDPR outside view
83
Average
79

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

The company holds a strong market position as a pioneer and leader in smart app download links, serving over a million users and billions of clicks monthly. Its business model is subscription-based SaaS with tiered plans catering to different customer segments including nonprofits and enterprises. The target audience includes app developers, marketers, and businesses seeking to streamline app downloads and marketing campaigns. The website content and FAQ demonstrate a clear understanding of customer needs and provide extensive support resources. The company maintains consistent branding and legal compliance, with transparent contact information and privacy policies. No parent or subsidiary companies are indicated, suggesting an independent operation focused on its niche.

Security posture

The website employs industry best practices including HTTPS, modern security headers, and secure handling of local storage. No exposed sensitive data or vulnerable libraries were detected in the HTML content. However, there is no explicit security policy or vulnerability disclosure program publicly available, which could improve user trust and incident response readiness. The privacy policy is comprehensive and GDPR compliant, and cookie consent mechanisms are implemented. Overall, the security posture is strong for a SaaS web service, with recommendations to formalize security governance and incident response disclosures.

Recommendations

  1. Publish a dedicated security policy page outlining security controls and practices.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Provide clear incident response contact channels such as security@ or abuse@ emails.
  4. Designate and disclose a Data Protection Officer contact to enhance GDPR compliance transparency.
  5. Regularly audit and update third-party scripts and dependencies to mitigate supply chain risks.

Contact details published on the site

Legal name
OLTO AB
Registration number
registration number 559151-6223
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
OLTO AB
Description
Onelink.to is a web-based service providing smart download links and QR codes that simplify app distribution by automatically directing users to the correct app store based on their device. Founded in 2011 in Stockholm, Sweden, it serves millions of users and billions of clicks monthly.
Key services
Smart download links, Dynamic QR codes, Device detection and redirection, Analytics and statistics, UTM campaign tracking
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript (ES Modules), React (Preact-like framework), Google Fonts, Google Analytics (GA4), LocalStorage and IndexedDB usage
Frameworks
Preact (or similar lightweight React alternative)
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of secure cookies and local storage with expiry
  • No known vulnerable libraries detected

Analytics and tracking

Services
Google Analytics (GA4)
Tracking level
moderate
Privacy practices
good

Advertising

Marketing tools
UTM tracking
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content
  2. Strong focus on app marketing and smart download links
  3. Multiple language support with localized content
  4. Comprehensive FAQ and support resources
  5. Use of modern web technologies and analytics
  6. No signs of malicious or suspicious activity
Technical notes

Notes

The website uses a modern JavaScript framework similar to React (likely Preact), Google Fonts, and Google Analytics (GA4) for tracking. It leverages local storage and IndexedDB for client-side data management. The site is mobile-optimized with responsive design and asynchronous font loading for performance. SEO is supported with proper meta tags and structured data. No CMS or hosting provider details were detected from the HTML. Performance is fast with minimal blocking scripts. Accessibility features appear adequate though not explicitly detailed. The technical stack is well-suited for a SaaS marketing platform with opportunities to enhance security transparency and monitoring.
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. 78/100 −1Low25 findingsView report
  2. 79/100Low25 findingsView report
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