Privacy Policy

1. Who we are

Btwinus is a free, browser-based tool for private encrypted chat, operated at btwinus.com. For any privacy question or request, contact us.

2. Your chats: we never see them

This is the core of the product, so it comes first. When you use Btwinus to chat:

• Messages are end-to-end encrypted with AES-256-GCM. The key is derived from a passphrase only you and the other person know.
• Messages travel directly browser-to-browser over WebRTC. There is no Btwinus server in the middle. We operate no backend that could receive, relay, or store message content.
• Nothing is written to any database, because there is no database. When you close the tab, the conversation is gone — it was never stored anywhere to begin with.
• We do not collect names, email addresses, phone numbers, or accounts. There is no sign-up.

We could not hand over your chat history to anyone — including a court — because we do not have it and never did.

3. Website analytics (Google Analytics)

To understand how many people visit the site and which pages they read, we use Google Analytics 4 on our landing pages. This is the only data collection on the site, and it is off by default.

We use Google Consent Mode v2. When you first visit, analytics storage is set to denied. Google Analytics only collects data if you click Accept on the cookie banner. If you click Decline (or ignore it), no analytics cookies are set and no personal analytics data is collected.

If you consent, Google Analytics may process: a truncated/approximate location derived from your IP address, your device and browser type, the pages you view, and how you arrived at the site. We do not receive your name or any identifier that tells us who you are. Google acts as a data processor; see Google's Privacy Policy. We do not use Google Ads, ad personalization, or any advertising signals — those are permanently disabled.

We do not run analytics on the chat page beyond a page view, and never anything tied to chat content.

4. Local storage on your device

Btwinus stores a few small values in your browser's localStorage. These never leave your device and are not sent to us or anyone else:

• btw_consent — whether you accepted or declined analytics, so we don't ask again.
• btw_lang — your language preference (English / French / Lingála).
• theme preference — whether you chose dark or light mode.

These are functional settings, not tracking. You can clear them any time via your browser's "clear site data" option.

5. Hosting

The site is hosted on GitHub Pages. To deliver the page to you, GitHub processes standard web-server information such as your IP address in transient request logs. This is necessary for the site to load at all and is governed by GitHub's privacy statement. We do not have access to these logs.

6. No accounts, no email, no marketing

There is nothing to sign up for. We do not send newsletters, we have no user accounts, and we do not build profiles of visitors.

7. Your rights (GDPR / EEA & UK)

If you are in the EEA or UK, you have rights to access, rectify, erase, and restrict processing of your personal data, and to lodge a complaint with your local data protection authority.

In practice: we hold no personal data about you from the chat at all, so there is nothing to access or erase there. For analytics, the legal basis is your consent, which you can withdraw at any time by clicking Decline on the banner or clearing your site data — analytics stops immediately. To exercise any right or ask a question, contact us.

8. Children

Btwinus is not directed at children under 13 (or the relevant age in your country) and we knowingly collect no data from them.

9. Changes to this policy

If this policy changes, the "Last updated" date at the top will change. Material changes that affect analytics consent will be reflected in the consent banner.