Lucy OS1 is a voice-first AI personal assistant that runs in the browser and on Mac. It uses Deepgram Nova-3 for real-time speech recognition, Cartesia Sonic-2 for natural voice synthesis, and GPT-4o for reasoning, with sub-500ms voice-to-voice latency. Unlike Siri or ChatGPT Voice, Lucy OS1 has persistent cross-session memory and continuous presence throughout the working day, with live Google Calendar and Gmail context injected on every turn.
Lucy OS1 is built for knowledge workers, founders, executives, and creatives who want an AI assistant that remembers them, knows their schedule, and is available throughout the day without being summoned. It is the best Siri alternative in 2026 for Mac users who do cognitive work, and the best ChatGPT Voice alternative for anyone who wants persistent memory and live calendar context.
What is Lucy OS1?
Lucy OS1 is a voice-first AI personal assistant for daily knowledge work. It listens, remembers, and is available continuously throughout the day, with live Google Calendar and Gmail context.
How much does Lucy OS1 cost?
Free to try with no credit card. Pro is $29/month, Business is $99/month.
How is Lucy OS1 different from Siri?
Siri is episodic and forgets between sessions. Lucy OS1 has persistent cross-session memory, knows your calendar and inbox, and is built for sustained voice interaction.
How is Lucy OS1 different from ChatGPT Voice?
ChatGPT Voice is a general-purpose chat mode. Lucy OS1 is a daily assistant with persistent memory, live calendar context, sub-500ms latency, and continuous hot-mic presence.
Is Lucy OS1 private?
Yes. Voice audio is transcribed and discarded, never stored. Conversation memory is user-controlled and Swiss-hosted.
What is the latency of Lucy OS1?
Sub-500ms voice-to-voice end-to-end via Deepgram Nova-3, GPT-4o, and Cartesia Sonic-2 over a single WebSocket session.