Hermes JS Engine is described as 'Hermes is a JavaScript engine optimized for fast start-up of React Native apps. It features ahead-of-time static optimization and compact bytecode' and is an app in the development category. There are 2 alternatives to Hermes JS Engine for a variety of platforms, including Mac, Windows, Linux, Android and iPhone apps. The best Hermes JS Engine alternative is SpiderMonkey, which is both free and Open Source.
SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI.
