This comparisson was made to help you understand the use of the IBOAPP as an assistent. Because the extensions for scheduling emails (Boomerang, Right Inboxm SndLatr) require the use of the desktop version of Gmail, Google Keep does not have an e-mail interface and sofisticated tools like OneNote and Evernote require 3rd party service for integration with Google Drive. So if you want something that is mobile and easy to work with, IBOAPP might be the right choice.
  IBOAPP Google Keep Evernote  OneNote Boomerang Right Inbox SndLatr
 Google Drive  Integration  +  +
 3rd party service

 3rd party service      
 Offline Access through Drive  +  +  +      
 Voice  Recording  -  +  +  +      
 Checklists  -  +  +  +      
 Images  +  +  +  +      
 Export     +  HTML Conversion Utilities  +      
 Collaboration  +  +  +  +      
 Rich Media  -  -  ~  +      
 Text Editing through Drive  -    +      
 Email Interface  +  +  +  -  -  -
 Mobile +  +  +  +  -  - -
 Reminders  +  +  + Outlook Tasks   +  +  +
 Recurring    -        -  +  -
 Scheduling  +        +  +  +
 Random Time  -        +  -  -
 Snippet  -        -  -  +
 Timezone  Support  ~        -  +  -
http://www.pcworld.com/article/2031818/google-keep-vs-onenote-vs-evernote-we-name-the-note-app-winner.html
http://www.journalisten-tools.de/recherchieren/sieben-evernote-alternativen-mit-und-ohne-cloud-speicherung/
http://praxistipps.chip.de/evernote-vs-google-keep-ein-vergleich_29274
https://www.thegooru.com/gmail-email-scheduler-which-one-is-right-for-you/