Building a Siri Replacement - Mac Desktop Agent Plus Wearable Capture
Why Siri Isn't Enough
Siri can set timers and play music. But ask it to "reschedule my 3pm meeting based on the email thread with Sarah" and it falls apart. Real personal AI needs to understand your full context - your calendar, your emails, your current project, your location, and what you were working on five minutes ago.
Two Halves of Personal AI
The real breakthrough is treating personal AI as two complementary systems: a Mac-side agent that handles the at-your-desk work, and a wearable that captures the away-from-keyboard side.
Your Mac agent handles the heavy workflows. It reads your screen, controls your apps, manages your files, and executes multi-step tasks across your desktop. It knows your codebase, your communication patterns, and your project context.
The wearable handles everything else. Conversations you have during walks. Ideas you mention at lunch. Meetings where your laptop is closed. The wearable captures ambient context and feeds it back to the Mac agent when you return to your desk.
The Integration Layer
What makes this powerful isn't either half alone - it's the connection between them. You mention a feature idea during a coffee walk. The wearable captures it. When you sit down at your Mac, the agent already has the context and can start scaffolding the implementation.
Or you're at your desk and tell the agent to "follow up on what I discussed with the team at lunch." The wearable transcript gives the agent enough context to draft the right follow-up messages.
Privacy Through Local Processing
Both halves run locally. The Mac agent uses native accessibility APIs. The wearable processes audio on-device. No cloud transcription service gets your private conversations. No API provider stores your screen contents.
This is the architecture that makes always-on AI acceptable. People won't wear a device that sends their conversations to a server. They will wear one that processes locally and syncs only with their own machine.
Beyond Voice Assistants
This isn't a better Siri. It's a fundamentally different category - a personal AI that knows your full context because it's present for your full day, not just the moments you explicitly invoke it.
- Voice AI as Your Chief of Staff
- AI Personal Assistant on iPhone and macOS
- Wearing a Mic - AI Agent Chief of Staff
Fazm is an open source macOS AI agent. Open source on GitHub.