Feedable
An offline feed reader with no sign-up, no account, no login, and no server database. Prepend feedable.doublememory.com/ to any webpage that has an RSS feed — it discovers the feed and loads it into a well-typographed reader.
https://feedable.doublememory.com

Why?
I was reading Daring Fireball on my reMarkable and the text just wasn't readable enough. I didn't want to install Android apps, register an account, or download anything — I just wanted to read.
So I built Feedable. Turned out great for me.
How it works
Open a feed directly, or prepend Feedable to any URL:
https://feedable.doublememory.com/https://example.com/blog

Favorite feeds and reading status per article are saved in your local storage — nothing leaves your device. Navigate with arrow keys on desktop, or tap the left and right edges of a post on a tablet.
Hopefully it's useful to others. If not, that's okay — it's useful to me.
Related
Same offline, no-account ethos as Podshare — another side quest where the URL does the heavy lifting. Podshare packs podcast feeds into a shareable link; Feedable prepends to any feed URL.