PeriodicTableHub takes its users' privacy seriously. This policy describes what data we collect (spoiler: virtually none), how it is used, and what rights you have.
Core Principle
PeriodicTableHub itself does not collect, store, or transmit any personal user data. We do not require registration and do not use data collection forms. To support the site we display Google AdSense ads — Google, as a third party, may use cookies (see the "Cookies" and "Third-Party Services" sections).
What We Do NOT Collect
- Names, email addresses, or other personal data
- Account credentials or passwords (no registration)
- Browsing history or search queries
- Geolocation or precise location
- Financial information (the site is completely free)
Browser Local Storage
For your convenience, PeriodicTableHub stores some settings in your browser's local storage (localStorage). This data never leaves your device:
Theme preference
Light or dark mode
Interface language
Ukrainian or English
Favorite elements
Your saved element list
View mode
Table, list, or blocks
Cookies
PeriodicTableHub itself does not set cookies for tracking or identifying users. However, we display Google AdSense ads, which may set advertising cookies to serve and measure ads. For users in the EU, UK, and Switzerland, consent for such cookies is managed by Google's consent banner (CMP) — you can accept or reject personalized advertising. Technical cookies may also be created by the hosting provider (Cloudflare) for basic site functionality.
Service Worker & Offline Access
PeriodicTableHub is a Progressive Web App (PWA) and uses a Service Worker for:
- Caching pages for faster loading
- Providing offline access to previously viewed pages
- Automatically updating the cache when a new site version is available
Cached data is stored exclusively locally on your device. You can clear the cache through your browser settings or remove the Service Worker.
Third-Party Services
PeriodicTableHub uses minimal third-party services:
- Cloudflare — hosting platform for deploying the site. Cloudflare may collect anonymous technical information (IP address, browser type) for service operation. Details in Cloudflare's privacy policy.
- Google AdSense — advertising network that displays ads to support the free site. Google may use cookies and device identifiers to serve and measure ads. You can manage your ad settings at Google Ad settings or review Google's advertising policy.
Apart from Google AdSense, we do not use Google Analytics, Facebook Pixel, or other tracking tools. Site analytics is handled by Cloudflare Web Analytics, which uses no cookies and does not profile individual users.
Children's Privacy
PeriodicTableHub is an educational resource safe for users of all ages. Since we do not collect any personal data, the site complies with children's privacy protection requirements (COPPA). Parents can be confident that their children can safely use PeriodicTableHub for learning.
Your Rights
You have full control over your data:
Policy Changes
We may update this privacy policy to reflect changes in site operations or applicable legislation. The current version is always available on this page. We recommend periodically reviewing this page.
Contact
If you have questions about privacy, contact us:
Last updated: June 2026