What are some alternatives?
When comparing Langotto and Duolingo, you can also consider the following products
Fluent - Fluent is a people-based marketing platform that uses real-time, one-to-one interaction to create custom audiences and serve personalized ads that drive performance at scale.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
MondlyAR - Learn languages in augmented reality
Rosetta Stone - Rosetta Stone is the world's most popular software for learning languages. It is offered at a cost of just $169 when purchased outright, but it is also possible to purchase language programs in a subscription format that offers ongoing support.