Edited 2.12.25
I had to eventually refund because there was too much latency for me.
However, the features were good overall and well thought out.
It became frustrating to type in Upbase due to the lag, so I started returning to Notion over time.
____
Prior review:
I've been looking for a good organizational / idea capturing tool.
I tried many on Appsumo so far and Upbase has the features and UX I've been looking for.

If you're a Notion.io user like me, taking notes on Upbase will feel intuitive.
You can also manage tasks via kanban card like Trello.
Plus several other great organizational sections like files, links, messages, chat, and a calendar.

You can create Folders, and add Lists inside, which I use to partition my projects.
Each List has it's own notes, kanban, etc. So it's a great way to jot my ideas down into it's bucket as inspiration hits me.

Finally, inviting others to work in your space is super intuitive, and you have the ability to choose which List(s) they can access.