Privacy Policy

1. Introduction

Enginus ("we," "our," or "us") respects your privacy and is committed to protecting your personal data. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you visit our website at enginus.org and use our structural engineering tools.

2. Data We Collect

Account Information

• Email address (when you create an account)
• Display name (optional)
• Account preferences and settings

Usage Data

• Pages visited and features used
• Calculator inputs and interactions (anonymized)
• Device type, browser, and operating system
• IP address (anonymized for analytics)
• Referring website and session duration

Cookies & Tracking

• Authentication cookies (to keep you signed in)
• Analytics cookies (to understand usage patterns)
• Advertising cookies (served by Adsterra, loaded only if you accept non-essential cookies)
• Preference cookies (to remember your settings, including your cookie choice)

3. How We Use Your Data

• Account creation and management
• Providing and improving our calculators and tools
• Analytics to understand how our tools are used
• Serving relevant advertisements via Adsterra, only if you've accepted non-essential cookies
• Sending account-related communications
• Preventing fraud and abuse

4. Third-Party Services

We use the following third-party services that may collect data:

• Supabase — Authentication and database services. Data stored securely in compliance with SOC 2 Type II.
• Vercel Analytics — Privacy-focused website analytics. No personally identifiable information is collected.
• Adsterra — Advertising network. Loaded only if you accept non-essential cookies via the banner or Cookie Settings; may use cookies to serve ads. See Adsterra's Privacy Policy.

5. Cookie Policy

You can accept or reject non-essential cookies via the banner shown on your first visit, or at any time via Cookie Settings in the footer of any page. Your choice is stored on your device and applies until you change it. If you reject non-essential cookies, the Adsterra advertising script is not loaded and no advertising cookies are set.

• Essential cookies — Required for authentication and core functionality. Cannot be disabled.
• Analytics cookies — Help us understand usage patterns. Can be disabled.
• Advertising cookies — Used by Adsterra for ads. Not loaded unless you accept non-essential cookies; can be disabled at any time via Cookie Settings.

6. Data Retention

We retain your personal data only for as long as necessary to provide our services and fulfill the purposes described in this policy. Account data is retained until you delete your account. Anonymized analytics data may be retained indefinitely.

7. Your Rights (GDPR)

Under the General Data Protection Regulation (GDPR) and similar laws, you have the right to:

• Access — Request a copy of the personal data we hold about you
• Rectification — Request correction of inaccurate data
• Erasure — Request deletion of your personal data
• Data portability — Request an export of your data in a machine-readable format
• Restriction — Request that we limit processing of your data
• Objection — Object to processing based on legitimate interests
• Withdraw consent — Withdraw consent for data processing at any time

To exercise any of these rights, contact us at privacy@enginus.org.

8. Data Security

We implement appropriate technical and organizational measures to protect your personal data against unauthorized access, alteration, disclosure, or destruction. This includes encryption in transit (TLS), secure authentication via Supabase, and regular security reviews.

9. Children's Privacy

Our services are not directed to individuals under the age of 16. We do not knowingly collect personal data from children. If you believe a child has provided us with personal data, please contact us at privacy@enginus.org.

10. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by posting the new policy on this page and updating the "Last updated" date. Continued use of our services after changes constitutes acceptance of the updated policy.

11. Contact Us

If you have questions about this Privacy Policy or wish to exercise your data rights, contact us at:

Email: privacy@enginus.org