Listed below are a number of very good apps that will add a new tool or tools to your classroom. All of these reading apps get good reviews and are used by a number of people in the field. I recommend that you try some of them.
Epic! - Unlimited Books for Kids Honorable Mention
This is an eBook subscription service for educators and parents. The service is free for teachers and librarians. The service also has a number of books that can be read to you. That is very helpful if you are looking for books for someone with a disability related to reading print material.
https://www.getepic.com/educators
https://itunes.apple.com/us/app/epic-unlimited-books-for-kids/id719219382?mt=8&ign-mpt=uo%3D4
Unite for Literacy
This website has a number of free online books for younger readers.
https://www.uniteforliteracy.com/
Newsela Honorable Mention
This website will adjust reading levels for the same article. This means that students on different reading levels can read the same article.
TweenTribune
This is a free reading website for teachers.
GCFLearnFree.org
This website has a number of free activities to help improves skills. The website gets some good reviews.
COMMONLIT
This website is free and tracks student’s progress when reading.
READTHEORY
This is a free website that gives you data on your student’s progress.
Starfall
This website is for young children learning to read. The website has a number of free materials.
https://www.starfall.com/h/index-grades123.php
Read Works
This website has a number of articles that are supported by audio and has other materials.