I just set up Readeck a few weeks ago, and I’ve been liking it. Very minimalist, utilitarian. One feature I’d like that isn’t included is the ability to add specific labels or collections to the sidebar, but that’s my only quibble so far.

It has an official browser extension for adding urls to it, but if you can’t or don’t want to use that, it has a nice api. I use the api to add bookmarks from my phone using a termux-url-opener script, which is as easy as the extension - just hit the “share” button and select termux, and it does the rest.