Quip: I type notes in a Quip document on my laptop and also open the same document on my Android phone. Quip syncs the notes automatically. When I want to note

Quip: I type notes in a Quip document on my laptop and also open the same document on my Android phone. Quip syncs the notes automatically. When I want to note down a math equation, I write it on a piece of paper, take a photo and append it to the Quip doc using the app. Later, I export the Quip doc to Markdown and make it searchable by adding it to Algolia.