There are a number of ways to teach spelling. I want to make a few suggestions. When you are teaching spelling to young children, you have to teach phonics and the parts of a word. You can find lists of the most commonly used 100 words. Every child should know how to spell all of those words. Memorizing letters within a word can be a mundane task. Anytime that you find a way to make this task more interesting or better target common words that is a win. I recommend looking at the options below.
Scholar - Spelling Bee Quiz
This app teaches you to spell commonly misspelled words. It gets into similar words. The ratings are excellent and well deserved. This is a difficult subject to address. This app will help you improve your spelling if you take the time to use it.
https://itunes.apple.com/us/app/scholar-spelling-bee-quiz/id1308540467
Spelling Training
This website allows you to make a list of spelling words or import one to study. This is a nice twist to the traditional way of learning spelling.
https://www.spellingtraining.com/
Spelling Notebook
You can create a list of spelling words to practice. This app helps teach spelling.
https://itunes.apple.com/us/app/spelling-notebook/id461225509?mt=8
Simplex Spelling Phonics - Rhyming With CVC Words
This is a very good spelling app.
https://itunes.apple.com/us/app/simplex-spelling-phonics-rhyming/id580762950?mt=8&ign-
Website: http://www.pyxwise.com/ssphonicscvc.html
Little Stars - Word Wizard
This is a highly rated game that teaches spelling.
https://itunes.apple.com/us/app/little-stars-word-wizard/id521736568?mt=8
Wonster Words Learning
This app teaches phonics and spelling. The app also gets great reviews.
https://apps.apple.com/us/app/wonster-words-learning/id881119321
Ultimate English Spelling Quiz
Google Play https://play.google.com/store/apps/details?id=com.damtechdesigns.quiz.spelling&hl=en
Windows https://www.microsoft.com/en-us/store/apps/ultimate-english-spelling-quiz/9nblggh1r9ns
American Wordspeller
Instead of looking a word up in the dictionary, you can use this app. Spelling rules do not apply. You can spell a word phonetically, and the app can find it. This is an app for those with poor spelling that needs to look up a word.
https://itunes.apple.com/us/app/american-wordspeller/id397617771?mt=8
Spell Board
This app creates fun activities to help you learn custom spelling lists.
https://itunes.apple.com/us/app/spellboard/id390290951?mt=8
Website: http://www.palasoftware.com/SpellBoard.html
YouTube.com
You can find videos of the most common 100 words and countless videos on phonics. When I show videos to students, they just focus or listen better. As much as I want to think of myself as being interesting YouTube.com tends to be more engaging interesting to my students.