PullApprove vs Octokit: What are the differences?
PullApprove: Approve Pull Requests with a comment. Just start a comment with "Approved" (or a custom regular expression) to sign-off without ever leaving GitHub. PullApprove can be configured by a .pullapprove.yml YAML file in the root of your repo. With it, decide exactly what "approval" means to your team; Octokit: GitHub API Client Library for .NET. It is a client library targeting .NET 4.5 and above that provides an easy way to interact with the GitHub API.
PullApprove and Octokit belong to "Tools for GitHub" category of the tech stack.
Octokit is an open source tool with 1.79K GitHub stars and 870 GitHub forks. Here's a link to Octokit's open source repository on GitHub.