What is Reddit's opinion of Umbrella Note?
From 3.5 billion Reddit comments

➔ Umbrella Note website

By popularity on Reddit, this Service is:

#203 in Note-taking apps

1 review of this app found across Reddit:

Someone is working on an open source app similar to OneNote called UmbrellaNote

https://www.reddit.com/r/opensource/comments/8bz4bm/free_open_source_and_better_looking_version_of/

https://umbrellanote.com/

Looks promising. I look forward to seeing competing software in this realm.