Tireez

I tried it after I've been using other apps and I really enjoyed it but I was very disappointed to see that not only there isn't a free option, it was expensive to buy it and use it. There's a 7 day trial, not even a month. I'll stick with other apps that are actually free. Edit after reply: when you only care about one language one lesson doesn't help to get a better idea of what this app has to offer. A free ad supported version would be ideal for this or at least a 30 day trial period.

Love it.