OpenCloak Replaces Personal Details in AI Prompts On Device

Summary

OpenCloak is a Chrome extension that detects personal details in prompts before they are sent to ChatGPT, Claude, Gemini, Perplexity, Grok, or DeepSeek. It runs the detector on the user's GPU through WebGPU, so the prompt is not sent to a separate OpenCloak server and no account is required. The extension pauses the submission and displays each detected value as a chip, allowing users to keep the original or replace it with a believable fake. The same value receives a consistent substitute so a conversation remains coherent, and OpenCloak marks restored values in the returned response with the fake that the AI service received. The project says the extension currently guards ChatGPT, while other sites may prefetch text and are not yet handled. Installation requires downloading and unpacking the Chrome extension, enabling Developer mode, and having hardware-accelerated WebGPU, available in Chrome since version 113. The underlying detector is experimental, so a clean scan means only that nothing obvious was found. The project also warns that common-word fakes may be restored incorrectly and that values split across separate reply elements may not be detected reliably. OpenCloak is MIT-licensed, while its bundled model, training data, and libraries retain their own licenses.