BabbleAI

Privacy Policy

Last updated: 2026-10-10

This policy explains what we collect when you use this adaptive language-learning platform, how long we keep it, and what control you have. In one sentence: your learning data is used only to drive the adaptive engine and generate your learning content, never for advertising, and you can delete it at any time.

What we collect

To provide the service, we process the following data:

  • Answer events: the answers you submit, whether they are correct, response time, and confidence self-rating.
  • Learning state: knowledge-point mastery, error attribution, and the spaced-review queue.
  • Account info: the email used to sign in (email one-time-code login).
  • AI practice content: your conversation text with the AI and its retrieval vectors.
  • Learning records: practice sessions, listening mock-exam scores, and experiment group.

Purposes

  • Compute your weak points, review queue, and next question selection (the core service).
  • Generate ability reports and learning progress.
  • Keep your account and credit records accurate.
  • Prevent abuse (rate limiting, blocking abnormal requests).

Learning state and AI models

Your learning state (what you know and do not know) is stored independently in our own PostgreSQL database and is never written, as the sole source, into any third-party LLM's conversation memory.

Third-party services we use

  • Model services: conversation and content generation, text embedding retrieval.
  • Speech synthesis: pronunciation of example sentences and AI characters.
  • Object storage: caching and delivery of audio and other static assets.

Retention

  • Learning data is kept with your account until you request deletion.
  • Deletion requests are processed within 7 business days.
  • Backup data is cleared on a rolling cycle.

Cookies

  • Essential cookies: login session and learning-content language preference.
  • We do not use advertising or tracking cookies.

Who we share with

We never sell your personal data. Only the service providers above process your data, under constraints and solely to fulfill your requests.

Your rights

You have the right to access, correct, delete, and object to the processing of your data. You can make a request via the Data Deletion page or by email; we will handle it within 30 days.

Security

Site-wide HTTPS encryption; database access follows least privilege; your learning state and answer data are used only on this platform.