Right, I forgot about the iOS version of the OneNote app. I guess I am searching for a more cross-platform solution (much like Google Notebook. Also, it looks like Microsoft is migrating OneNote out of Office suite and make it available as a default app in Windows, but will require a subscription to Office 365 to unlock features [1]. So cost becomes an issue when this occurs..

[1] https://www.pcworld.com/article/3269056/software-productivit...