Blitz vs Gatling: What are the differences?
Blitz: Load testing for websites, web apps, and REST APIs. Build bulletproof, scalable solutions with Blitz - a simple and fun service for load testing web apps and APIs in the cloud. Blitz offers powerful yet simple capabilities including continuous monitoring, performance testing and remediation. Blitz enables you to instantly burst up to 50,000 concurrent users against your app in seconds from multiple points of presence around the world; Gatling: open-source load testing framework based on Scala, Akka and Netty. Gatling is a highly capable load testing tool. It is designed for ease of use, maintainability and high performance Out of the box, Gatling comes with excellent support of the HTTP protocol that makes it a tool of choice for load testing any HTTP server. As the core engine is actually protocol agnostic, it is perfectly possible to implement support for other protocols. For example, Gatling currently also ships JMS support..
Blitz and Gatling can be categorized as "Load and Performance Testing" tools.
Gatling is an open source tool with 4.3K GitHub stars and 918 GitHub forks. Here's a link to Gatling's open source repository on GitHub.