I recently used Labelops for my thesis project and it was very straightforward to set up. Their customer service was exceptional, their turnaround time was amazing, and my supervisor was extremely pleased with the final product. This may be a good option if you are looking to quickly get started on your project. There isn't much that I disliked about my experience using this platform, however, I do wish there were more options for setting up your own style guide as an editor. I highly recommend Labelops! My research group uses this platform to create labels for datasets from multiple sources for our machine learning model. The end result is always of high quality and within a few days of submitting the file, I receive notification that the labels are ready for me to download.