I tried out a few apps and found this to be
– most responsive
– easy interface
– intuitive
– allows you to edit text if misunderstood
If it had more languages available it would get a 5+ rating!
https://itunes.apple.com/us/app/id536091314
photos copyright app owners – used here solely to make this app recognizable from amongst the many others also available under similar names on the ios store.