I was quite fond of using this app now it appears they're branching out into ancient languages.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://catholicherald.co.uk/news/2019/08/28/latin-course-launches-on-duolingo/&ved=2ahUKEwj1lqSxjajkAhUSnVwKHb1bC7UQxfQBMAB6BAgBEAQ&usg=AOvVaw3hCUHeU9L0TtU_9o8ylgaZ
https://www.google.com/url?sa=t&source=web&rct=j&url=https://catholicherald.co.uk/news/2019/08/28/latin-course-launches-on-duolingo/&ved=2ahUKEwj1lqSxjajkAhUSnVwKHb1bC7UQxfQBMAB6BAgBEAQ&usg=AOvVaw3hCUHeU9L0TtU_9o8ylgaZ