Uppy

vs

Dropzone.js

Dropzone makes it faster and easier to copy and move files, open applications and share files with many different services. Dropzone also ships with a powerful scripting API and with a little programming knowledge you can modify any of your actions or even create entirely new ones. This gives Dropzone unlimited extendability and utility. We're always thinking up new actions so Dropzone will become even more useful over time.

Uploadcare provides companies with simple, powerful, developer-friendly file uploading, processing & delivery for web apps. With Uploadcare you and your team get a complete out-of-the-box solution, built for engineers by engineers. Uploadcare service include features like webhooks for notifying when your application is about to upload files or trigger actions, document conversion for 12 formats ranging from PDFs to JPEG. Video processing that allow you to crop, trim, adjust resolution, generate thumbnails and encode into MP4, WebM, and OGG. Object recognition that  allow you to tag images with detected objects. Receive a list of objects with certainty values.