Paid subscriber. It changes correct responses to make them wrong in the "check response process" with words you didn't input ; it omits exclamatory first words; misspells names, etc., in voice type. It has a worm algorithm; you have to scrutinize every character you voice type. If you click off the mic quick after your input, you can stop it from changing your correct response. App stops after 2X XP, drops points. You have to fight your way through; takes the fun out of the learning process.