Wisperflow
Local-first Windows voice dictation tool. Hold a key, speak, and get polished text injected anywhere on Windows.
Overview
Designed a highly modular, decoupled architecture by defining clear trait contracts for audio capture, STT engine, cleanup rules, and text injection.
Integrated whisper.cpp via whisper-rs for fast, on-device speech-to-text processing without relying on external cloud APIs.
Engineered the Win32 API integration strategy for global hotkey detection and seamless text injection, utilizing modern tooling to handle the low-level hooks.
Key Challenges:
- •Designing a robust event-handling strategy to accurately manage audio resampling and complex focus-stealing edge cases on Windows.
- •Structuring the modular pipeline so that underlying engines (like Groq STT vs local LLMs) could be swapped effortlessly without breaking the core system.
Built With
Rust
Language
Tauri
Framework
whisper.cpp
AI / STT
Key Features
Local-First STT
Runs whisper.cpp models directly on-device, ensuring complete privacy with no cloud audio processing.
Global Hotkey
Hold Ctrl+Space from anywhere in Windows to start dictating instantly.
Universal Injection
Uses Win32 SendInput and clipboard pasting to inject transcribed text into the currently focused window.
Modular Pipeline
Highly decoupled Rust architecture allowing easy swapping of STT models, cleanup rules, and input sources.
Audio Capture
Reliable microphone capture using cpal (WASAPI) with automatic resampling.
Rules-based Cleanup
Conservative regex and rules engine to polish transcribed text before injection.
Visual Showcase
Development Journey
Core Architecture
- Defined trait contracts for Transcription, Cleanup, and Injection
- Set up Cargo workspace and crates structure
- Implemented cpal audio capture and resampling
Integration
- Integrated whisper-rs for local STT
- Built Win32 SendInput and clipboard injection
- Wired global hotkey (Ctrl+Space) listener
Refinement
- Added regex-based text cleanup rules
- Tested pipeline end-to-end via CLI PoC
- Planned Tauri shell and local-LLM integrations
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