Based on our record, HelloChinese seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
My experience with DuoLingo as well. I've learned Portuguese, Spanish, and some Italian with it, but Mandarin seems to fall short. I'm liking HelloChinese so far. Source: over 4 years ago
I don't think Rosetta Stone will be nearly advanced enough for you, from what I recall it's quite basic. I'm personally really liking HelloChinese as a way to learn and practice, but again I'm far below your level. I've heard good things about Skritter for learning characters, and I've used Memrise before for other languages to improve my vocabulary and I've heard it's good for Mandarin as well. Searching for... Source: over 4 years ago
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Learn Chinese (Hello-Hello) - Chinese Learn Chinese Hello Hello free download - Hello English: Learn English, Learn Chinese, Learn Chinese with Hello-Hello, and many more programs
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Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.