Recently, I humbly tried to put one together. I chose a few apps that I think have nice word prediction capabilities. Each app offers a little something different in features, exporting options, and appearance. These are important differences to note because in the school setting, there is more to evaluate when choosing an app than just "does it offer word prediction?" For example, in my school district we are very conscientious of digital citizenship- we do not allow underage children to use email accounts on our devices. Therefore, if I am purchasing a word prediction app for an elementary aged student, I am looking for an app that exports products to the student's Google Drive app (this way they can share their work with teachers securely through our school provided Google Doc accounts.)
You can find my word prediction comparison chart of iOS apps here:
Word Prediction iOS Apps: Features Comparison Chart
*This is not an all-inclusive list of word predictions apps; the features listed for each app are subject to change as updates are made available through the app store.
If you are interested in purchasing word prediction software for a computer, check out Spectronics comparison chart here: Literacy Support Software Comparison Chart
Apps featured in the comparison chart: