Last updated: September 12, 2026
Privacy
LeetIn is built around your LeetCode account, so the most important privacy promise is simple: we do not store your LeetCode cookies in our database.
What stays in your browser
- Your LEETCODE_SESSION cookie, csrftoken, LeetCode username, avatar URL, selected list, and starred problems are saved in browser localStorage.
- Logging out removes your saved LeetCode cookies from this device. While signed in, the individual cookie fields can also be cleared one at a time from Settings.
What is sent to LeetIn servers
- When you load problems or generate exercises, your LeetCode cookies are sent in request headers so the server can read your LeetCode problems and accepted submissions.
- Those cookies are used for the request and are not written to the database.
What may be stored
- Generated exercises, exercise progress and refreshed company problem lists may be stored so the product works across sessions and deploys.
- For Auto Mode, generated solution caches may be stored to avoid repeatedly calling the AI provider for the same problem.
What we avoid storing
- We do not intentionally store your LeetCode session cookie, csrf token, or full LeetCode submission source code as user data.
- Operational logs should not include cookies, csrf tokens, or submitted source code.