There are some great kindle, android and ios apps out there for learning! I've also listed some of my favorite multi-sensory programs and resources that work well for our students and are worth the investment. Here are just a few suggestions:
Abby Sight Words Games & Flash Cards for Reading Success. There is a free and paid version. Android and iOS.
More resources on the app. For Kindle, Android, and iOS
Teachly: Addimal Adventures. Free and paid versions. Single digit addition, multiple strategies
Not an app, but multi-sensory learning package to learn to spell Letters & Sounds, Colors & Shapes, Numbers, Math, Sight Words, CVC & Word Family Songs, Phonics.
Touch Math is a fantastic method that works for many of our students. The touchscreen apps are the best way to learn this system.
Child 1st offers a number of learning products. I really like the Snapwords product which offers visual and whoie body strategies to learn site words and more. They also have apps for this.
Sight Words that stick is a favorite teaching tool.
I See, I Spell, I Learn is one of my favorite sight word products.