Top 35 language learning sites. Cast your vote.
Anki isn't on the list. There's also a large difference in how ''user-generated'' Duolingo courses are, versus Memrise ones. The best way to compare the sites would be to let people take CEFR tests in those languages after they used these sites, and then look at which one is most effective.
Impossible. No learner (at least no serious learner) will be using just one website. Impossible to compare someone using just Duo, someone using Duo+a serious coursebook, someone using Anki+Duo+Pimsleur, and so on.
There is also Linguaphone
It costs money but doesn't seem to be as expensive as Rosetta Stone. It is self-study using cd's and books. Some of the language courses have mp3 downloads.
As well, there isn't the motivation like there is with Duolingo: no streaks, no lingots, no friends, no discussion, but the bright side for some people is there would be no health bars.
..................................... Some of my experiences with LInguaphone
In the early 1980's I did a French Campion Language course, which was a branch of Linguaphone. It was on cassette tapes (outdated technology). I liked it. There was a workbook, the lesson book. It was conversations, no translating like Duolingo has. I completed this course. I had to mail in my written tests and my oral tests, which was on a cassette tape. The teacher mailed the cassette tape back to me, with her talking on it in French, translating some of it to English, because she maybe wasn't sure if I would understand. She gave me tips about my pronunciation. One I remember was when she said to say "Jshwee" instead of "Je suis". She said my French was good and to keep doing something with French so I wouldn't forget French. ..........................
I also have a Chinese Linguaphone course and a Spanish Linguaphone course, which I bought in the 1980's. I never did anything with the Spanish course, but I tried the Mandarin Chinese. Basically, it is conversations, 30 lessons in all, each 3 parts. One was a monologue, with one speaker talking, then two conversations. You were supposed to listen, looking at the English. At first it was all Greek to me, but after I listened to it a million times, it would play in my head (kind of memorizing it). Then I'd start to understand some of the words. Each lesson had a vocabulary section and grammar section, where it analyzed each sentence and explained the grammar.
I found it extremely hard on my brain at the time but I managed to learn a little bit.
I read the English texts for some of the later lessons. In one, there is a long monologue where Wang Dawen, who was a tour guide, was guiding some people around Tiananmen Square. He was telling about what an important square it was, etc.
Another lesson was interesting. A woman got hurt and was in a hospital in China. The nurse and doctor were talking to her and saying her Chinese was good. I don't remember it all.
I was working at a Chinese restaurant at the time, and one time I was reciting some of the Chinese lesson from memory to a cook there who was from China and knew Mandarin. He liked it but told me to talk loud. He was always getting me to help him with his English.
I never attempted their writing.