Abyss

Abyss offers an easy way to store links for later reading. Every link that you store will be available to you on your iPhone, iPad, and Mac, forever.

You'll never have to sign in to any external service because all your data is safely stored on your own personal iCloud account and only you have access to it. Everything that you save on your iPhone will also appear on your Mac and on your iPad without you having to do anything.