One more question

Can I build GitHub Apps using Octokits in other languages? 

Hi @happydogcode!

Yes! In fact, if you want to get started with Octokit.js, we recommend using Probot, a Node.js framework for building GitHub Apps that comes prepackaged with Octokit.js, including both REST and GraphQL APIs. We also support Octokit.net.

Check out all of the official Octokit Libraries!