League Mastery is an unofficial fan tool that helps League of Legends players track their champion mastery. We respect your privacy and are committed to transparency about how we handle your data.
This privacy policy explains what information we collect, how we use it, and your rights regarding your data.
We temporarily process your Riot ID (Name#TAG) to fetch your mastery data from the official Riot Games API. This identifier is used solely for the API request and is not stored permanently in any database.
We cache mastery data for 24 hours to reduce API calls and improve performance. This data is stored on Cloudflare's edge network and includes:
We use essential cookies to remember your consent preferences. We do not use tracking or advertising cookies. The cookies we use:
Important: We never store passwords, email addresses, or any personally identifiable information beyond your publicly available game statistics.
Your data is used exclusively for:
We do not use your data for advertising, tracking, profiling, selling to third parties, or any other purposes beyond providing the core functionality of this tool.
We do not sell or share your personal data. Data is only shared with:
To fetch your mastery data from the official Riot Games API. This is subject to Riot's Privacy Policy.
For caching and edge computing. Data is stored temporarily on Cloudflare's edge network and automatically expires after 24 hours. Subject to Cloudflare's Privacy Policy.
Client-side charting library loaded from CDN. No data is sent to external servers - all chart rendering happens in your browser.
Your privacy is protected: We never sell or share your data with advertisers, data brokers, or third parties for marketing purposes.
Under the General Data Protection Regulation (GDPR) and other privacy laws, you have the following rights:
Since we don't maintain user accounts or long-term storage, most data requests are automatically fulfilled through our 24-hour automatic deletion policy.
All cached data automatically expires after 24 hours. We do not maintain long-term storage.
Your consent preferences are stored locally in your browser and can be cleared at any time through your browser settings.
Basic access logs may be kept for up to 7 days for security and debugging purposes, but do not include personal data beyond IP addresses.
24-Hour Auto-Delete: Your mastery data cache expires automatically after 24 hours and is permanently deleted.
We implement industry-standard security practices to protect your data:
However, no internet transmission is 100% secure. While we take reasonable precautions, we cannot guarantee absolute security.
League Mastery does not knowingly collect data from children under 13 years of age. This service is designed for League of Legends players who have existing Riot Games accounts, which already comply with Riot's age requirements and parental consent policies.
If you are a parent or guardian and believe your child has provided us with personal information, please stop using the service immediately.
This service relies on the following third-party services:
Each of these services has their own privacy policies and terms of service.
We may update this privacy policy from time to time to reflect changes in our practices or legal requirements. Significant changes will be indicated by updating the "Last Updated" date at the top of this page.
We encourage you to review this policy periodically. Continued use of League Mastery after changes constitutes acceptance of the updated policy.