Colossus vs Grape: What are the differences?
Developers describe Colossus as "I/O and Microservice library for Scala". Colossus is a lightweight framework for building high-performance applications in Scala that require non-blocking network I/O. In particular Colossus is focused on low-latency stateless microservices where often the service is little more than an abstraction over a database and/or cache. For this use case, Colossus aims to maximize performance while keeping the interface clean and concise. On the other hand, Grape is detailed as "An opinionated micro-framework for creating REST-like APIs in Ruby". Grape is a REST-like API micro-framework for Ruby. It's designed to run on Rack or complement existing web application frameworks such as Rails and Sinatra by providing a simple DSL to easily develop RESTful APIs. It has built-in support for common conventions, including multiple formats, subdomain/prefix restriction, content negotiation, versioning and much more.
Colossus and Grape can be categorized as "Microframeworks (Backend)" tools.
Colossus and Grape are both open source tools. Grape with 8.87K GitHub stars and 1.09K forks on GitHub appears to be more popular than Colossus with 1.14K GitHub stars and 100 GitHub forks.