Readwise has been building its own fully integrated reading app. It’s a more powerful, more flexible version of the classic read-it-later app. From newsletters, RSS reading, Twitter threads, web highlighting, read-it-later, and PDFs, Readwise is looking for their Reader app to be the one-stop place for power readers to get all of their reading done. They're working on features from instant syncing, to highlighting images, to powerful search, also:

It’s made to handle modern and established content alike, from Twitter threads to PDFs, and everything in-between.
It serves both casual and power users, with the flexibility to accommodate a variety of consumer, professional, and academic use cases.
It’s designed with a local-first, cross-platform architecture enabling blazingly fast interactions and full-text search across all of your devices (even offline).
It connects seamlessly with all your other tools for thought such as Roam Research, Notion, Evernote, and Obsidian.
It embeds powerful workflows to help you conquer content overload — one of the most acute pain points of read-it-later power users.
It's being actively developed with responsive customer support and rapid feedback loops informed by beta testers who are already reading in the app for hours a day.

Readwise reading app is still in private beta because it's not ready yet for self-serve onboarding, but they’re letting in friendly beta testers. If you're an existing Readwise subscriber, you can be among the first users to gain access to the public beta once it's launched. If you wish to gain earlier access (or you’re not already a Readwise user), sign up to join the waitlist for the private beta.

I am really looking forward to this app. I’m already sold on Readwise and being able to put the entire read-it-later workflow into one app (with all these features) sounds great.