MoLoPoLY

If you can selfhost, you can try my SyncMarks AddOn. It will work on any webextension compatible browser, e.g Firefox, Chrome, Chromium, Edge, Brave, Kiwi and so on. You can sync across all Browsers.

The backend is working with selfhosted PHP/MySQL (or SQLITE) stack. If you can’t use this, you can fallback to WebDAV as backend, but with limited functionality.

The addon can work together with the standard sync mechanisms in all these browsers, but it’s up to you if you want that.

If the addon is not installed, you can access the backend url with any browser and use it as WebApp. With apps like Tasker or HTTPShortcuts, you can share any url, from any to the backend.

I have a similar issue but in my case between KDE and Gnome. KDE is much cleaner by display the fonts as Gnome. But I prefer using Gnome, because of the cluttered interface of most KDE applications.