Privacy Policy

Last updated: March 2026

1. Who we are

Brain Flow ("we", "us", "our") operates the Brain Flow service available via WhatsApp at brain-flow.org. If you have questions, contact us at [email protected].

2. What we collect

When you use Brain Flow we collect:

• Your WhatsApp phone number (stored as a one-way hash — we never store the raw number)
• The text, voice, and image messages you send to the service
• Timestamps associated with your messages

We do not collect your name, email, location, or any information beyond what you explicitly send us.

3. How we use your data

We use your data solely to:

• Store your notes and make them searchable for you
• Generate AI summaries and pattern insights on your behalf
• Send you daily digests via WhatsApp

We never sell, share, or use your data for advertising.

4. Third-party services

We use the following third-party providers to operate the service:

• OpenAI — for AI-generated summaries and embeddings. Your message content is sent to OpenAI's API to power these features.
• Twilio — to send and receive WhatsApp messages.

5. Data retention

Your notes and summaries are retained for as long as your account is active. You can request deletion of all your data at any time by contacting us at [email protected].

6. Security

Your phone number is stored as a cryptographic hash and never in plain text. All data is stored on encrypted infrastructure. We use HTTPS for all data in transit.

7. Your rights

You have the right to access, correct, or delete your personal data at any time. Contact us at [email protected] to exercise these rights.

8. Changes

We may update this policy from time to time. The latest version is always available at this URL.