I was a heavy Pocket user. When Mozilla closed it, I tried the alternatives, watched a couple of those shut down too, and then built the tool I actually wanted. Readit is a free read-it-later app: save what you find, read it in a clean reader, listen to it on a walk.
Free. Sign in, upload your Pocket CSV export, done.
Upload the CSV from Pocket's export, and articles re-parse in the background into clean, readable, listenable pages. Instapaper exports work too.
Readit is built and run by one person, and it's new. Things will occasionally break, and I'll fix them. It's free, the browser extension is open source, and your data exports anytime from Settings, because I know exactly how it feels when a reading app disappears.
Also switching from Omnivore, Matter, or Instapaper? The importer takes any CSV or list of links.