FluidVoice is a macOS desktop application for real-time voice dictation, meeting transcription, and AI-powered text enhancement. It provides a local-first dictation experience with on-device speech recognition (Parakeet, Nemotron, Whisper, Apple Speech) and optional cloud AI post-processing. The application features a command mode for AI chat, meeting recording with speaker diarization and acoustic echo cancellation, and a local HTTP API for external integrations. The architecture is a native SwiftUI/AppKit application with a service-oriented design. Audio capture uses CoreAudio and ScreenCaptureKit, with a vendored WebRTC audio processing stack for echo cancellation (AEC3), noise suppression, and voice activity detection. Speech recognition is handled by multiple providers, with model downloads from Hugging Face. The application includes a durable PCM storage system with chunk ledger for meeting audio, a signed model release feed for secure updates, and a comprehensive settings/persistence layer using SQLite and UserDefaults. Key entry points include FluidApp.swift (main application), LocalAPIRouter.swift (HTTP API server), MeetingSummaryProvider.swift (AI meeting summaries), ASRService.swift (speech recognition orchestration), and DictationAppSession.swift (dictation workflow). External dependencies include macOS system APIs, SQLite, vendored WebRTC audio processing, and various AI provider APIs (OpenAI, Anthropic, etc.). The repository also contains research-grade audio processing code (WebRTC AEC3, AGC2, RNN VAD) and pronunciation learning evaluation tools, but the dominant character is a production macOS application with extensive testing and CI/CD.