Last updated: March 24, 2026
We collect: email address (for authentication), phone number (for one-time bot protection verification), usage data (lessons viewed, homework completed), and device fingerprint (for fraud prevention only — to detect multiple free accounts from the same device).
We use your information to: provide and improve our educational service, send important service updates, prevent fraud and abuse, and analyze usage to improve AI quality.
Your phone number is used exclusively for one-time verification to prevent bot accounts. We do not store your phone number in plain text, do not use it for marketing, and never share it with third parties.
Your data is stored securely using Supabase (EU servers). Lesson content and audio are cached locally on your device for performance. You can clear this data at any time.
We use: Google (authentication), Anthropic Claude (AI lessons), OpenAI (text-to-speech), Twilio (phone verification), Monobank Acquiring (payments). Each service has its own privacy policy.
You have the right to: access your personal data, request deletion of your account and data, export your data, and opt out of non-essential communications.
We use essential cookies for authentication only. We do not use tracking or advertising cookies.
For privacy concerns, contact us at support@sfera.app