As an experienced, National Board Certified Teacher I have high standards for what I think is a good app, especially when it comes to paid ones. This app is a must have for families and teachers of 3-8 year olds. It allows students to practice spelling at their level, whether CVC words, CVCe, etc. I especially love the hint feature that allows children to successfully complete more challenging words.
I use this app in my kindergarten class during reading groups. It is very useful for Making Words lessons, by using the moveable alphabet.
The most recent update has only made the app more perfect for school and home use, allowing you to choose a spelling pattern to focus on.
My 3 yr old likes to play with it, building words using the hints and repeating the letter sounds. My 7 year old practices his spelling with it too.
There are few apps I would pay for to put on all of my classroom iPads, but this is certainly one of them.