Heynote is described as 'Dedicated scratchpad for developers. It functions as a large persistent text buffer where you can write down anything you like. Works great for that Slack message you don't want to accidentally send, a JSON response from an API you're working with, notes' and is a Note-taking tool in the development category. There are more than 50 alternatives to Heynote for a variety of platforms, including Mac, Windows, Linux, Web-based and Android apps. The best Heynote alternative is Logseq, which is both free and Open Source. Other great apps like Heynote are Notesnook, Zettlr, Zim and Xournal++.