MAMP vs ngrok: What are the differences?
Developers describe MAMP as "A free, local server environment *". It can be installed under macOS and Windows with just a few clicks. It provides them with all the tools they need to run WordPress on their desktop PC for testing or development purposes, for example. It doesn't matter if you prefer Apache or Nginx or if you want to work with PHP, Python, Perl or Ruby. On the other hand, *ngrok** is detailed as "Securely expose a local web server to the internet and capture all traffic for detailed inspection and replay". ngrok is a reverse proxy that creates a secure tunnel between from a public endpoint to a locally running web service. ngrok captures and analyzes all traffic over the tunnel for later inspection and replay.
MAMP and ngrok can be categorized as "localhost" tools.
ngrok is an open source tool with 16.7K GitHub stars and 2.9K GitHub forks. Here's a link to ngrok's open source repository on GitHub.
a2c systems, Bannerman, and Yproximite are some of the popular companies that use ngrok, whereas MAMP is used by RANGER, Thrivera, and Pharma4u GmbH. ngrok has a broader approval, being mentioned in 34 company stacks & 82 developers stacks; compared to MAMP, which is listed in 4 company stacks and 8 developer stacks.