Was recently talking to a friend who works in this field. He says the golden standard of nudging is currently achieved by Duolingo. They manage to find that sweet spot between being pushy enough while it not being too much. Of course, YMMV, but they do have lots of recurring customers.
I haven’t used Duolingo before, but I had it in mind when I was writing this article. Do you care about the streak you’re maintaining on Duolingo?
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