Catarina: Privacy for ChatGPT, Claude & Gemini

Catches personal data, API keys and passwords before you send them to ChatGPT, Claude or Gemini. Free. Nothing leaves your browser.

We've all done it. You paste an email into ChatGPT to help with a reply, and only afterwards notice it had a client's phone number in it. Or a card number in an invoice. Or your API key in a config file. Once it's sent, it lives in your chat history with the AI company. Catarina catches these before you hit send. Free, on ChatGPT, Claude and Gemini. Everything happens in your browser, so your messages never go anywhere. How it helps When your message contains something personal or secret, a short note appears above the message box. One click swaps the details for placeholders like [EMAIL_1] or [CARD_1], and the AI can still help you just as well. Prefer to send it as it is? That's fine too. Catarina never blocks you. What it spots - Email addresses, phone numbers and IP addresses - Card numbers and IBANs (it checks the numbers properly, so random digits don't set it off) - ID numbers from India, Brazil, Mexico, Spain, Portugal, France, Italy, Germany, the Netherlands, Canada, the US and the UK - API keys, tokens and passwords A bonus if you build things with AI When the AI writes code for you, Catarina checks it too: leaked keys, databases left open to anyone, and other risky shortcuts. It tells you in plain words what's wrong and how to fix it. Your privacy, for real No account. No tracking. No servers. Catarina doesn't use AI and doesn't send your messages anywhere. You can read exactly what it does in our privacy policy. What it won't do Catarina looks for patterns, so it can't recognise names, home addresses or health details, and it won't catch everything. Think of it as a second pair of eyes, not a guarantee.