HelloChinese seems well regarded
askchapo
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HelloChinese is the one I've heard the most good things about, it seems to work well for most people
I've used Pimsleur in the past with good success for Portuguese and Mandarin. It seems to work really well for me. Duo Lingo did nothing for me. There are also some dedicated Mandarin learning apps, but I've never used any of them.
Bump cause I'm also interested