LibreAvatrak
LibreAvatrak is a free, lightweight facial motion-capture tool for VTubers and virtual-avatar creators.
What LibreAvatrak is
LibreAvatrak is a free, lightweight facial motion-capture tool for VTubers and virtual-avatar creators. It uses one camera with MediaPipe to detect facial landmarks and calculate head pitch, yaw, and roll. Eye openness is derived with the eye-aspect ratio, while mouth movement uses the mouth-aspect ratio. OpenCV handles camera capture and image processing. Tracking data streams through a Python and Flask multiprocess backend that provides a low-latency HTTP data API, then reaches Godot to animate VRM humanoid avatars in real time. Setup calls for a Python environment and Godot Editor 4.6. The workflow includes loading a VRM file in Godot and saving the replacement character scene as an .scn file. Licensed under GNU Affero GPL v3, it permits commercial creator revenue while requiring source sharing for modified network services and restricting closed modifications, packaged sales, and paid cloud capture services.
Good
- Free software with no charge for individual creators
- Tracks head pitch, yaw, and roll
- Streams data to Godot in real time
- Provides a low-latency HTTP data API
- Supports VRM humanoid avatars
Watch out
- Requires Python and Godot Editor 4.6
- Uses a single-camera workflow
- License requires source sharing for modified network services
- Paid cloud motion-capture services are prohibited
Who it suits
It suits VTubers and virtual-avatar creators using a single camera, Godot, and VRM characters. Commercial content creation is permitted under its license terms.
Verdict
LibreAvatrak combines single-camera facial tracking with a Godot and VRM workflow. Its free AGPL license allows commercial content, but imposes source-sharing and service restrictions.
Plans and prices
From LibreAvatrak's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| LibreAvatrak | Free | Free/Libre software; individual creators may use it without charge |
The facts
Each one read from LibreAvatrak's own pages, with the date it was checked.
What it does
- Avatar animation
- Tracking data streams to Godot to animate VRM humanoid avatars in real time.checked 4 Oct 2026
- Camera processing
- The project lists OpenCV for camera video capture and image processing.checked 4 Oct 2026
- Character setup
- The instructions describe loading a VRM file in Godot and saving the replacement character scene as .scn rather than .tscn.checked 4 Oct 2026
- Commercial use
- The project permits creators to earn revenue from content made with the software, including VTuber streaming and commercial production.checked 4 Oct 2026
- Data API
- Its Python and Flask multiprocess tracking backend provides a low-latency HTTP data API.checked 4 Oct 2026
- Expressions
- It extracts eye openness using EAR and mouth movement using MAR.checked 4 Oct 2026
- Face tracking
- It uses MediaPipe to detect face landmarks and calculate head pitch, yaw, and roll.checked 4 Oct 2026
- License
- LibreAvatrak is licensed under the GNU Affero General Public License v3.checked 4 Oct 2026
- Network source sharing
- The project says modified instances or publicly accessible network services must share their modified source code.checked 4 Oct 2026
- Purpose
- LibreAvatrak is a lightweight, single-camera facial motion capture tool for VTubers and virtual avatar creators.checked 4 Oct 2026
- Requirements
- The setup instructions call for a Python environment and Godot Editor 4.6.checked 4 Oct 2026
- Restrictions
- The project says users may not modify and close the source, package and sell the software, or build paid cloud motion capture services based on it.checked 4 Oct 2026
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