EP McGuffey Primer is in the Google Play Store. It's an offline app to use to practice those sight words.
Here's an overview of what you'll find in our early education courses. They learn to read well, numbers to 100, basic calendar lessons, handwriting and writing letters, numbers, words, building to sentences.
It kind of cuts me off at the end. Hopefully, it gives you a good idea of how it works and how to use it.