Just like VIA, our application is purely client side, meaning that no data is uploaded to the server. Images are loaded from files and annotated locally, in the browser. Region attributes, as featured in VIA are a very interesting feature. A similar feature that we are thinking of but is not implemented is annotation comment. Export to standard formats as Microsoft COCO or Pascal VOC are not implemented but just like Labelbox, there could be a simple conversion script from our Json format to each of these. Let us know if you did one. One thing we are not going to do, at least for the near future, is a collaborative tasks management server. We believe that our tool is flexible enough that you could integrate it in such server if you need it. Yet it is embedable in microtasks services like Amazon Mechanical Turk (see the Crowd-sourcing page).