Sharing feature and Pricing of Obsidian, Roam Research and Obsidian

Surprisingly, Roam Research offers no free plan. Not at all.

Compared to that, Obsidian is very generous. For personal use, it’s all free. Sounds like an awesome deal, but there’s a catch. You need to subscribe to a $8-per-month service called Obsidian Sync for between-device synchronization, or you can roll your own. You also need to subscribe to yet another $8-per-month service called Obsidian Publish to publish your data. Collaboration using these seems limited in that it does not offer conflict resolution, unless you use Github as a backend.

RemNote offers a free plan, but to take advantage of collaboration, you need to subscribe to a $8-per-month Pro plan or higher.