Privacy

Privacy Policy

One Step One chỉ lưu dữ liệu cần thiết để học, review và vận hành gói Free/Plus.

Data we store

Account email, display name, password hash and session token.
Lesson progress, quiz attempts, wrong-answer flashcards and AI usage counts.
Manual Plus payment requests, method, note and approval status.

AI and voice

AI explain and TTS requests may be sent to the configured provider, such as OpenAI or Google Cloud, only when server keys are enabled. If no key is configured, the app falls back to browser speech synthesis.

Operations

Admin can export/restore the local VPS data store and clean stale anonymous guest records. Registered accounts and payment-linked guests are not removed by guest cleanup.