I have a 900+ day streak, which sounds incredible but it is not. You get 5 hearts per day and ads to watch to refill, and most lessons are a guessing game. I've made it like 3 tiers into Spanish and can't go any further because it doesn't actually teach you verbs and how to use them it just makes you guess so I find myself using 4 hearts to try and do the lesson then saving a heart to go and repair a lesson just to keep the streak. It's too expensive for unlimited hearts. I'm annoyed now