Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
ClevNote - ClevNote is an amazing mobile application that helps you to write the daily memos on your smartphone.
Standard Notes - A safe place for your notes, thoughts, and life's work
Notepad by Splend Apps - Notepad by Splend Apps is one of the best mobile apps that enables you to create a to-do list and notes.
Startup Notes - Most actionable advice from each Startup School speaker
Keep My Notes - Keep My Notes is a fantastic mobile application that allows you to create notes and organizes your notes in the folder efficiently.