Last year, Duolingo's (NASDAQ: DUOL) stock price seemed detached from the company's terrific performance. The number of daily active users on its language learning app surged 62%, but the stock lost nearly one-third of its value.

This year, it seems the stock market has finally begun to realize that Duolingo's language learning application can do more than just sign up a lot of free users. The stock is up 119% this year.

Is it too late to buy Duolingo now that it's more than doubled this year? Here's what you should know.

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Source Fool.com