This is an app for iOS and Android which has a lot of content, much of it in the form of comics. You can also find the text for each comic separately, but not all the content is free. It’s a little bit hard to figure out what is actually free, but I have used the app for a while and it seems that much is available for free.
The pictures are high-quality and really helps with understanding, and you can even click words inside of the comics to bring up definitions, Pinyin and so on.You can toggle translations, read grammar notes and more. The only downside is that the app seems quite buggy at the moment and some images don’t load. Still, even if you ignore the comic bit and only use the pure text version, it’s still a good reading resource for beginners!