Arc vs Dart: What are the differences?
What is Arc? A dialect of the Lisp programming language developed by Paul Graham and Robert Morris. Arc is designed for exploratory programming: the kind where you decide what to write by writing it. A good medium for exploratory programming is one that makes programs brief and malleable, so that's what we've aimed for. This is a medium for sketching software.
What is Dart? A new web programming language with libraries, a virtual machine, and tools. Dart is a cohesive, scalable platform for building apps that run on the web (where you can use Polymer) or on servers (such as with Google Cloud Platform). Use the Dart language, libraries, and tools to write anything from simple scripts to full-featured apps.
Arc and Dart can be categorized as "Languages" tools.
According to the StackShare community, Dart has a broader approval, being mentioned in 19 company stacks & 78 developers stacks; compared to Arc, which is listed in 7 company stacks and 6 developer stacks.