Privacy Policy

Last updated: July 16, 2026

What We Collect

Yesterday AI collects the minimum information needed to deliver our service:

• Phone number — Used for authentication and SMS delivery.
• Preferred name — Used to personalize your daily briefings.
• Preferences — Your AI knowledge level, explanation depth, timezone, and delivery time.
• Conversation history — Messages you send and responses we provide, used to improve your experience and maintain conversation context.

How We Use Your Data

• Delivering your daily AI briefings via SMS.
• Personalizing explanations to your knowledge level.
• Remembering past conversations to provide better answers.
• Improving our service.

Third-Party Services

We use the following services to operate:

• Twilio — SMS delivery. Subject to Twilio's Privacy Policy.
• OpenAI — AI-powered explanations. Subject to OpenAI's Privacy Policy.
• Supabase — Database hosting. Subject to Supabase's Privacy Policy.

Data Retention

We retain your data for as long as your account is active. If you unsubscribe, we keep your data for 30 days before permanent deletion. You can request immediate deletion by contacting us.

Your Rights

You can:

• Access your data through the account portal.
• Update your preferences at any time.
• Delete your account by texting STOP or through the portal.
• Request a copy of your data by contacting us.

SMS Consent

By providing your phone number and signing up for Yesterday AI, you consent to receive recurring automated SMS messages including daily AI briefings and conversational responses. Message frequency varies. Message and data rates may apply. Text STOP to cancel at any time. Text HELP for help.

Contact

Questions about this policy? Contact us at privacy@yesterdayai.com.