The customer support is amazing: when I first downloaded this app, it kept on crashing as soon as I wanted to change the reference language. I sent an email to the customer support, and less then 24h after, they contacted me to tell me that theyve solved the problem! I can now use this app perfectly. I really like the way they add a bit of grammar an sentence structure while making you learn useful dialogue skills. I do not regret subscribing for a year!