Language-learning software maker Duolingo (DUOL) late Thursday beat Wall Street's targets for subscribers, total users and revenue in the fourth quarter. But Duolingo stock fell in extending trading.

The Pittsburgh, Pa.-based company added 900,000 paying customers in the December quarter, ending the period with 9.5 million subscribers. It reported 40.5 million daily active users and 116.7 million monthly active users, topping consensus estimates of 40.2 million and 116.5 million, respectively.

Duolingo offers instruction in more than 40 different languages on its freemium service. Its free service is supported by advertising while its paid subscription service is ad-free.

Duolingo's revenue rose 39% year over year to $209.6 million in Q4. Its adjusted earnings before interest, taxes, depreciation and amortization increased 49% to $52.3 million. Duolingo did not give an earnings-per-share figure in its shareholder letter.

Analysts polled by FactSet had expected earnings of 48 cents a share on sales of $205.5 million. In the year-earlier period, Duolingo earned 26 cents a share on sales of $151 million.

In after-hours trading on the stock market today, Duolingo stock slid more than 2% to 366.25. During the regular session Thursday, Duolingo stock fell 2.8% to close at 375.78.

Earnings report details to follow.

Duolingo stock is on two IBD lists: IBD 50 and Tech Leaders.

Follow Patrick Seitz on X, formerly Twitter, at @IBD_PSeitz for more stories on consumer technology, software and semiconductor stocks.

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