Privacy Policy
Last updated: September 2026
1. Guest Mode & Zero User Tracking
SQLancer operates entirely in Guest Mode. We do not require or maintain any user login accounts, password stores, or third-party authentication tokens. Anyone can freely access all lessons, practice sandboxes, and developer tools without signing in or providing personal details.
2. Local Storage Progress
Your exercise progress, local code snippets, and settings are saved locally inside your browser's localStorage. This data never leaves your device and is never uploaded to our servers.
3. Database Sandboxes and Client Execution
All database query execution in our SQL Playground runs locally inside your web browser via WebAssembly (SQLite-Wasm). No database state, table schemas, or query outputs are transmitted across external networks.
4. Cookies & Analytics
We do not use tracking or advertising cookies. Basic edge server logs may be maintained for infrastructure security and rate-limiting purposes.
5. Contact Us
If you have questions about our guest-first architecture or privacy practices, reach out to us at privacy@sqlancer.com.