Really liked this app until....

I was making good progress on learning Spanish until I reached day 4 and suddenly this crazy "Health" feature showed up. Dont make mistakes or it stops your progress unless you go back and work on stuff you already know OR you buy your way out of the blockage. That is really what they want. They want you to pay. At one level I understand they want to make money. (The advertisement money must not be good enough) On another lever, there are other free apps out there.

Listener Ruth about Duolingo Learn Many Languages for Free, v5.1.7