What ProMatte is 

ProMatte is a free, open-source real-time background removal filter for OBS Studio. It removes, blurs or replaces your webcam background using an on-device AI model — no green screen, no cloud service, and nothing ever leaves your machine. It works on Windows today, with Linux and macOS builds in progress. 

Why it exists 

Most webcam background tools either need a physical green screen, send your video to a cloud API, or cost a recurring subscription. ProMatte runs entirely locally: no account, no telemetry, no network calls except an explicit, one-time model download with a checksum you can verify yourself. It's built to work on modest hardware too — it was verified end-to-end on a 2017 dual-core laptop with an entry-level GPU, not just high-end machines. 

How it's built 

ProMatte uses ONNX Runtime with DirectML for GPU acceleration and falls back to CPU automatically. Several AI models are bundled (Apache-2.0/MIT-licensed), and higher-quality models like Robust Video Matting download on demand. A background worker thread keeps OBS's render loop from ever waiting on AI inference, and an adaptive quality controller learns the fastest settings for your specific hardware over time. The plugin itself is GPL-2.0-or-later; the source is fully open on GitHub. 

What your support funds 

ProMatte will always stay free and open source. Contributions go toward development time, testing on a wider range of GPUs and laptops, and training or licensing better AI models for sharper edges and hair detail. If you use ProMatte and it saves you from buying a green screen or a subscription tool, a contribution here — or just a star on GitHub — genuinely helps keep it going.