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Accounts & guest mode
Sign in with email/password or Google. Guest mode lets you try everything read-only. Your first few marks are kept on this device until you create a free account. Password resets arrive by email from the login page or Profile → Security.
AI insights & honesty
AI features try a cascade of free models and fall back to a built-in rule engine, and every result is labeled with which one produced it. AI analysis needs a free account so shared quota can't be drained anonymously.
Your data & progress
Solves, stars, notes, revisions, and sessions are stored in your account (Supabase Postgres). Profile → Preferences & data lets you export everything as CSV/JSON, import it back, or permanently delete your account.