As a company, we're using CVAT platform for annotations. Also we received the annotation service. It was a very good experience for us. All images annotated and handed over to us smoothly.
They were very open and flexible to our requirements, a quite complex semantic segmentation of bio images. The annotation speed was amazing. The quality was also very good.
CVAT is the #1 open-source labeling platform because of its maturity, code quality, and ease of use. Thousands of companies, including many Fortune500 companies, use it. CVAT is the official annotation tool supported by the OpenCV Foundation.