Turn your smartphone into a wireless PC microphone over WiFi — no hardware, no cloud, no cost.
Millions of PC users don't have a microphone. Voice calls on Zoom, AI voice assistants, voice recording — all blocked by "No microphone detected." Buying a mic costs money. But every phone already has a great mic.
BlueFlow bridges your phone's microphone to your PC over WiFi. Your PC sees it as a real, connected microphone — Zoom, Discord, Google Meet, and any other app just works.
| Feature | Details |
|---|---|
| 🎙 Virtual Microphone | Phone mic appears as a real mic on your PC |
| 📝 Live Transcription | Real-time voice-to-text (offline, via Vosk) |
| 📱 Zero Phone Install | Phone just opens a web page — no app store needed |
| 📶 WiFi Connection | Low-latency audio over your local network |
| 🔒 100% Offline | No cloud, no data leaves your network |
| 📋 Copy Transcription | Copy-paste your spoken text from the dashboard |
| 🔗 QR Code Connect | Scan and connect in 2 seconds |
📱 Phone (Browser) 💻 PC (Python Server)
┌──────────────────┐ ┌─────────────────────────────┐
│ │ WiFi/WebSocket │ │
│ Mic Capture │ ──── PCM Audio ───▶ │ Audio Router │
│ (AudioWorklet) │ (binary) │ (sounddevice) │
│ │ │ │ │
│ Permission │ │ ├──▶ VB-Cable ──▶ Apps│
│ Handling │ │ │ (Virtual Mic) │
│ │ │ │ │
│ Live Text ◀─────│◀── JSON ────────── │ └──▶ Vosk STT │
│ Display │ (transcription) │ (offline) │
└──────────────────┘ │ │
│ Dashboard UI │
│ (QR, status, transcription)│
└─────────────────────────────┘
Audio format: PCM 16-bit, 16kHz, mono · Transport: WebSocket (binary frames) · Virtual driver: VB-Cable
| Requirement | Link | Notes |
|---|---|---|
| Python 3.11+ | python.org | Make sure pip is available |
| VB-Cable | vb-audio.com/Cable | Run installer as Admin, restart PC |
| Vosk Model | alphacephei.com/vosk/models | Download vosk-model-small-en-us-0.15 (~40MB) |
# 1. Clone the repo
git clone https://github.com/your-username/BlueFlow.git
cd BlueFlow
# 2. Create & activate virtual environment
python -m venv .venv
.\.venv\Scripts\activate # Windows
# 3. Install dependencies
pip install -r requirements.txt
# 4. Place Vosk model
# Extract the downloaded model into the models/ folder:
# BlueFlow/models/vosk-model-small-en-us-0.15/
# 5. Run!
python run.py
|
|
Tip: In Zoom/Discord, go to Settings → Audio → Microphone and select "CABLE Output (VB-Audio Virtual Cable)"
BlueFlow/
├── run.py # Entry point
├── server/ # Python backend
│ ├── app.py # FastAPI server + WebSocket handlers
│ ├── audio_router.py # Routes audio to VB-Cable
│ ├── transcriber.py # Vosk offline speech-to-text
│ ├── device_manager.py # Finds VB-Cable device
│ ├── ssl_manager.py # Self-signed HTTPS cert generator
│ └── config.py # Constants
├── mobile/ # Phone client (served as web page)
│ ├── index.html # Mic UI + permission modal
│ ├── css/mobile.css
│ └── js/
│ ├── mobile.js # Mic capture + WebSocket
│ └── audio-processor.js # AudioWorklet (PCM)
├── ui/ # PC dashboard
│ ├── index.html # Dashboard UI
│ ├── css/dashboard.css
│ └── js/dashboard.js
├── models/ # Vosk model (user downloads)
└── requirements.txt
| Issue | Fix |
|---|---|
| Mic permission denied on phone | Tap 🔒 in address bar → Permissions → Microphone → Allow |
| VB-Cable not detected | Install VB-Cable, restart PC, then run BlueFlow |
| No sound in Zoom/Discord | Set mic to "CABLE Output" in the app's audio settings |
| Phone can't reach PC | Both must be on the same WiFi network |
| SSL warning on phone | Tap "Advanced" → "Proceed" — it's your own local server |
Built to solve a real problem for people who can't afford a microphone.