1. Zero-Telemetry Calculation Architecture
All electrical computations — including power, current, voltage, resistance, room sizing, and energy estimates — are processed entirely within your client browser using vanilla JavaScript. Numerical inputs and calculation results are never transmitted to our servers, logged to analytics platforms, or stored remotely. Calculations function 100% offline once the page has loaded.
We do not log, inspect, transmit, or store any electrical values you enter (including voltage, current, resistance, power, or appliance configurations). Your calculation session is completely private, confidential, and ephemeral.
2. Information We Collect
We collect only information voluntarily submitted through our Contact Support form (name, email, subject, message). Standard server access logs (IP address, user agent) are retained for 14 days solely for security monitoring and DDoS defense, after which they are automatically purged.
- Voluntary Contact Form Submissions: If you choose to contact our engineering team via our contact form or direct email, we collect your name, email address, inquiry category, and message text solely to respond to your technical request or bug report.
- Server Infrastructure Logs: When your browser requests static assets (HTML, CSS, JavaScript files), our hosting edge network automatically logs standard HTTP connection metadata. These logs are retained for a maximum of 14 days solely for security monitoring and DDoS defense.
We never sell, rent, monetize, or trade user contact details with third-party advertising networks, data brokers, or commercial aggregators.
3. Local Storage & Cookie Audit
Watt Calculator uses zero third-party advertising cookies, zero tracking beacons, and zero cross-site analytics scripts. We utilize standard browser localStorage strictly for essential user preferences: 'wattcalculator-theme' (light/dark mode) and 'preferred_lang' (language preference). No sensitive engineering parameters or identifiers are stored.
| Storage Key | Storage Type | Lifespan | Purpose |
|---|---|---|---|
wattcalculator-theme |
Browser localStorage | Persistent (until cleared) | Stores your preferred color scheme (dark or light mode) to prevent visual screen flash. |
preferred_lang |
Browser localStorage | Persistent (until cleared) | Stores your active language preference (e.g. en, es, hi) for seamless localized browsing. |
You may clear these keys at any time via your web browser's storage settings without degrading calculator functionality.
4. GDPR & CCPA Compliance
Under European Union General Data Protection Regulation (GDPR) Articles 15–22 and the California Consumer Privacy Act (CCPA/CPRA), users possess the right to access, rectify, or erase any personal data submitted via contact forms. Watt Calculator never sells, rents, or monetizes personal data. To exercise privacy rights, contact privacy@wattcalculator.org.
- Right of Access & Rectification: You may request confirmation, digital copies, or corrections of any support correspondence.
- Right to Erasure ("To Be Forgotten"): You may request immediate deletion of your past support correspondence.
- No Sale of Personal Information: Watt Calculator has never sold, rented, or shared personal data with third parties and will never do so.
5. Data Security & Encryption
All network traffic is enforced via modern Transport Layer Security (TLS 1.3) with HTTP Strict Transport Security (HSTS) and Content Security Policy (CSP) headers to safeguard transmission integrity.
6. Contacting the Data Protection Officer
For inquiries regarding our zero-telemetry architecture or data protection practices, contact our Data Protection Officer at privacy@wattcalculator.org.
Watt Calculator Privacy & Compliance Office
Attn: Data Protection Officer
Email: privacy@wattcalculator.org / dpo@wattcalculator.org
500 Howard Street, Suite 400, San Francisco, CA 94105, USA