Uploadcare vs Red

Uploadcare doesn't require you to define cached transformations, and handles them quickly for you so you don't have to fiddle with configurations.

Their APIs are open source on github so you can see the source and provide pull requests.

Uploadcare provides a client side widget and API, with well worded documentation that clearly explains how each part of the widget is implemented. The client side API also implements the jQuery promises interface for cleanly defining callbacks and updating with progress.

With the client side API decoupled from the upload interface, you can much more easily create customized UI's that match the look and feel of your site.

Other languages have complex, multi-step setups that beginners often get stuck on. Red has no installer, no setup, no dependencies*, just a single small (~1MB) command-line executable with both the compiler and repl. On Windows, you don't even have to launch executable from the command line--it has a GUI-console.

Red syntax is a lot like Rebol. It's easier than most languages for beginners to pick up.

Red has low enough access to do systems programming, but it's expressive enough for high-level scripting.

Red has very simple syntax that's easy to learn. It gets out of your way and lets you think about the problem instead, enhancing productivity.