Sentient OS, a YC F26 startup, has launched on-device AI powered by a local LLM that processes a user's personal context overnight. Two features are highlighted: double-tapping the right Command key drafts email replies in the user's own writing style, and clicking the notch triggers computer use to complete on-screen tasks. The company says all knowledge is stored as a markdown folder on the user's Mac, and describes itself as privacy-focused and open-source. It claims over 10,000 users across 130+ enterprises, including Adobe, Nebius, and Liquid AI.

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