Privacy Policy

1. Introduction

Welcome to EtG Calculator (etg-calculator.org). We are committed to protecting your privacy and being transparent about how we handle your information. This Privacy Policy explains what data we collect, how we use it, and your rights regarding your personal information.

By using our website and tools, you agree to the practices described in this policy. We may update this policy periodically, and the "Last Updated" date at the top reflects the most recent changes.

2. Data Collection

We collect limited data to provide and improve our services. Here's what we collect and how:

2.1 Calculator Input Data (Local Only)

When you use our EtG calculators, you enter information such as:

• Number of drinks consumed
• Body weight and gender
• Drinking time and test time
• Test cutoff levels

Important: This data is processed entirely in your browser using JavaScript. We do not upload, store, or transmit your calculator inputs to our servers. Your calculation history may be saved locally on your device using browser storage (localStorage) for your convenience, but it never leaves your device.

2.2 Automatically Collected Data

Like most websites, we automatically collect certain technical information when you visit:

• Browser Information: Browser type, version, language preferences
• Device Information: Device type (desktop, mobile, tablet), operating system
• IP Address: Your approximate location (city/region level, not precise address)
• Page Views: Which pages you visit, how long you stay, navigation paths
• Interaction Data: Clicks, scrolls, and other user interactions (via Microsoft Clarity)

This data is collected through cookies and similar technologies provided by third-party services (see Section 7).

3. Data Usage

We use the collected data for the following purposes:

• Service Delivery: To provide calculator functionality and display content
• Analytics: To understand how visitors use our site, which pages are most popular, and where users come from
• Improvement: To identify bugs, optimize performance, and improve user experience
• Advertising: To display relevant advertisements through Google AdSense (see Section 7.2)
• Security: To detect and prevent abuse, spam, or malicious activity

We do not:

• Sell your personal information to third parties
• Use your calculator inputs for any purpose (they never reach our servers)
• Share your data with third parties except as described in Section 7
• Use your data for purposes unrelated to operating and improving our website

4. Data Protection

We take reasonable measures to protect your data:

• HTTPS Encryption: All connections to our website use HTTPS encryption to protect data in transit
• Local Processing: Calculator inputs are processed locally in your browser, never transmitted to servers
• Limited Data Collection: We only collect data necessary for analytics and service improvement
• Third-Party Security: We use reputable third-party services (Google, Microsoft) with strong security practices
• No User Accounts: We don't require registration or store user credentials

However, no method of transmission over the internet is 100% secure. While we strive to protect your data, we cannot guarantee absolute security.

5. User Rights

You have the following rights regarding your data:

• Access: You can request information about what data we have collected about you
• Deletion: You can request deletion of your data (limited to analytics data, as we don't store calculator inputs)
• Opt-Out: You can opt out of analytics and advertising cookies (see Section 6)
• Local Data Control: You can clear your browser's localStorage to delete locally saved calculation history
• Do Not Track: We respect browser "Do Not Track" signals where technically feasible

To exercise these rights, contact us at contact@etg-calculator.org.

6. Cookies and Tracking

We use cookies and similar technologies for analytics and advertising purposes.

6.1 What Are Cookies?

Cookies are small text files stored on your device by your browser. They help us remember your preferences and understand how you use our site.

6.2 Types of Cookies We Use

• Essential Cookies: Required for basic site functionality (e.g., storing calculation history locally)
• Analytics Cookies: Used by Google Analytics 4 to track page views and user behavior
• Advertising Cookies: Used by Google AdSense to display relevant ads
• Session Replay Cookies: Used by Microsoft Clarity to record user interactions for UX analysis

6.3 Managing Cookies

You can control cookies through your browser settings:

• Most browsers allow you to block or delete cookies
• You can opt out of personalized ads at Google Ad Settings
• You can opt out of Google Analytics using the Google Analytics Opt-out Browser Add-on

Note: Blocking essential cookies may affect site functionality, such as saving your calculation history.

7. Third-Party Services

We use the following third-party services to operate and improve our website:

7.1 Google Analytics 4

Purpose: Website traffic analysis and user behavior tracking

Data Collected: Page views, session duration, traffic sources, device information, approximate location

Privacy Policy: Google Privacy Policy

7.2 Google AdSense

Purpose: Display advertisements to support website operations

Data Collected: Browsing behavior, ad interactions, device information (used for ad targeting)

Privacy Policy: Google Ads Privacy Policy

Opt-Out: Google Ad Settings

7.3 Microsoft Clarity

Purpose: User experience analysis through session recordings and heatmaps

Data Collected: Mouse movements, clicks, scrolls, page interactions (anonymized)

Privacy Policy: Microsoft Privacy Statement

8. Policy Updates

We may update this Privacy Policy from time to time to reflect changes in our practices or legal requirements. When we make significant changes, we will:

• Update the "Last Updated" date at the top of this page
• Notify users through a prominent notice on our website (for major changes)
• Continue to honor the privacy commitments made in previous versions

We encourage you to review this policy periodically to stay informed about how we protect your information.

9. Contact Us

If you have questions, concerns, or requests regarding this Privacy Policy or your personal data, please contact us:

• Email: contact@etg-calculator.org
• Response Time: We typically respond within 2-3 business days

For data access, deletion, or opt-out requests, please include "Privacy Request" in your email subject line and provide details about your request.