Updated 4/3/2021
There are tons of these apps. I’ve only tried a few. Many of these apps can open and annotate pdf files also. I’ve tried a few others but these stand out. My current favorites are Noteshelf and Goodnotes.
iOS
iOS Text Editors, Word Processors, and Markdown Editors
Updated 4/3/2021
While I’m not interested in reviewing apps, I’ve been asked several times which ones I use. This is my step to answer those questions.
Keep in mind that word processors offer more formatting options than text editors.
Please see this site for a great comparison of iOS text editors.
iOS PDF Annotation Packages
Updated 4/5/2019
I spend a lot of time reading articles for research–these articles are generally pdf files. I’ve tried several different annotation packages for the iPad.
Note: I have no interest in reviewing apps–lots of other people do that already. However several people have asked what apps I use. Your preferences will vary.