Hello teachers! I was told about this resource at a workshop, and I thought you might find it useful. It is free to a certain extent, that it, you can change the complexity of the texts by changing the amount of words there will be (which is great for adjusting difficulty levels within a same group!) and you have access to quizzes related to the readings. The only limitation to the free account seems to be that you will not have access to all of the texts offered.
This is how you determine the difficulty of the text.
This text above has less words, while the text below has more.
You can assign (and print) quizzes to accompany the text.
Hi
How can we have acess to it
Thyx