Labelme

What Labelme is

Labelme is an AI-powered desktop annotation tool for creating image training datasets, aimed at researchers, engineers, and teams. Its annotation options include polygons, rectangles, oriented rectangles, circles, lines, points, masks, and rich attributes. The tool can run SAM, SAM2, SAM3, EfficientSAM, and YOLO-World locally rather than through a hosted API. SAM3 accepts box and text prompts, SAM2 or EfficientSAM can use point prompts, and YOLO-World returns bounding boxes. The maker says images, annotations, and exports stay on the user's machine, without cloud processing or telemetry. Once model weights are downloaded, annotation and AI assistance work offline; air-gapped use is possible by transferring models or requesting the offline pack. The application is GPL-3.0, while the Pro dataset toolkit is closed source. Starter costs $49, paid once and includes one year of updates. Pro costs $79, paid once with one year of updates and adds a dataset toolkit with exports including YOLO, YOLO-OBB, and Pascal VOC. Pro Lifetime costs $249, paid once and includes lifetime updates.