Privacy Policy

Last updated: 2026-06-23.

What we collect

• Account. Your email and a hashed password. Passwords are stored only as a salted hash — never in plain text — and are never logged.
• Profile. Optional display name. No real name or phone number is required.
• Eye measurements. The vision measurements you record are saved to your account so you can track them over time. This is health-related information; we treat it as sensitive and never share it with advertisers or analytics providers.
• Server logs. IP address, user agent, and request paths, kept up to 30 days for security and abuse prevention.

How we use it

To provide the measurement tools and your history, keep your account secure, and prevent abuse. We do not sell personal data, show third-party advertising, or use your data to train AI models.

Who we share it with

• Self-hosted infrastructure — we host the app and store your data on servers we operate. Your data is not handed to a third-party database, authentication, or hosting provider.
• Product analytics — a third-party analytics provider records anonymous usage events (e.g. which tools are used). It is configured to mask all on-screen text and form inputs, so your eye measurements and personal details are not sent to it.
• Error monitoring — when the app hits an error, a diagnostic report (stack trace and request context) is sent to a third-party error-monitoring provider so we can fix it.

Cookies & analytics

Eye Ruler sets an HttpOnly cookie for your signed-in session. Our analytics provider (above) sets an analytics identifier (in local storage and a cookie) to count visits and measure feature use. We do not use cookies for advertising or cross-site tracking.

Your rights (GDPR / CCPA)

You can view, update, and delete your measurements and profile in the app. To request access to, correction of, or deletion of your personal data, email our privacy contact. EU residents may also lodge a complaint with their local supervisory authority.

Children

The service is not directed to children under 13 (or the applicable age of digital consent). We do not knowingly collect personal information from children.