Privacy Policy
Last updated 7 November 2026
Who We Are
BrainTwo is a personal knowledge app. It keeps your notes and turns the messages you send it into notes. BrainTwo is changing its name to Remn, and this policy applies under both names.
BrainTwo is run in the United Kingdom. To ask about your data, email [email protected].
What We Keep
- Your account. Your email address, and the sign-in details our sign-in service holds for you.
- Your content. Your notes and everything in them, including the captures you send to BrainTwo.
- WhatsApp. If you link a WhatsApp number to your account, we keep that number. A message you send to the BrainTwo WhatsApp number becomes a capture in your account.
- AI settings. If you turn on BrainTwo AI, we keep the API key or Claude subscription token you enter. We store it encrypted.
- Server logs. Our servers record requests, including IP addresses, to keep the service working and secure.
- Cookies. We use cookies only to keep you signed in. We use no advertising or tracking cookies.
How We Use It
We use your data only to give you the service you signed up for: to store your notes, sign you in, turn your captures into notes, reply to your WhatsApp messages and keep the service secure. UK data protection law allows this because it is needed to provide the service to you, and because we have a legitimate interest in keeping the service secure.
We do not sell your data. We do not show advertising. We do not use your content to train AI models.
Services We Use
- Hetzner hosts our servers and database in the European Union.
- Cloudflare carries traffic to our websites and stores our encrypted backups.
- Logto runs sign-in.
- Anthropic. When BrainTwo AI is on, BrainTwo sends the content the AI works on to Anthropic's Claude, under the terms of the API key or Claude subscription you entered.
- Meta. If you use WhatsApp capture, your messages to BrainTwo pass through WhatsApp, which Meta runs.
- AI apps you connect. If you connect an AI app, such as Claude, to your account, that app can read and change your notes as you allow it to. You can remove the connection at any time.
Some of these services can process data outside the United Kingdom. Where they do, they use the safeguards that UK data protection law requires.
How Long We Keep It
We keep your content until you delete it, or until you delete your account. Delete Account, in the app's settings, deletes your account, your notes and your sign-in. Our encrypted backups keep a copy for up to 60 days, and then delete it. Server logs are kept for up to three months.
Your Rights
Under UK data protection law, you can ask for a copy of your data, and ask us to correct it, delete it, limit how we use it, or send it to you in a form another service can read. You can also object to how we use it. Email [email protected], and we will answer within one month.
If you are unhappy with how we use your data, you can complain to the Information Commissioner's Office at ico.org.uk.
Children
BrainTwo is not for children under 13.
Changes to This Policy
When we change this policy, we update this page and the date at the top.