Investing.com - Duolingo Inc (NASDAQ: DUOL) second-quarter daily active user growth is tracking ~21.7% year-over-year, ahead of the +20.4% consensus and nearly 200 basis points above the company's own guidance, according to a June 29 update from DA Davidson analyst Wyatt Swanson. The encouraging headline, however, comes with a notable caveat: week-over-week DAU momentum has decelerated for three consecutive weeks, going flat in the fourth week of June after +0.6% the prior week, raising questions about what comes next for the app's engagement story.

DA Davidson tracks a proprietary panel of more than 170,000 existing Duolingo user accounts to estimate DAU trends ahead of quarterly results. Swanson's dataset now shows June DAUs tracking +5.7% month-over-month, up from the +5.0% reading two weeks prior, which feeds into the firm's consolidated 2Q'26 DAU estimate of 21.7% Y/Y growth. Swanson cautions that the panel structurally understates growth due to its underweight exposure to Asia-Pacific users. "We are still likely underestimating DAU growth, we believe because our panel is underweight APAC, and therefore there is likely upside to our 21.7% Y/Y estimates," he wrote. DA Davidson's final 1Q'26 panel estimate came in at 19.5% Y/Y versus Duolingo's reported 21.2%, a gap consistent with the firm's historical 100-200 basis point underestimation.

Despite the likely 2Q beat, Swanson's tone on the sustainability of that momentum is cautious. Duolingo launched a streak revival campaign at the start of June, which DA Davidson credited as a driver of the strong early-month surge. But by late June, the lift had faded entirely even as the campaign remained active. "What we're seeing now is despite the ongoing campaign, growth seems to have completely stalled, leading us to have further questions on the sustainability of DAU growth going into 2H'26," Swanson said.

The monetization picture adds another layer of uncertainty. Swanson notes that highly engaged users who rejoined through the streak revival promotion were likely on a one-month free trial, meaning any paid conversions would show up in third-quarter bookings rather than the current period. But he is skeptical about whether that flow translates into durable growth. "We aren't sure this streak revival event will translate to sustainable bookings growth and believe some more meaningful monetization changes will need to be made for both DAUs and bookings to grow hand-in-hand," he wrote.

The bar for the third quarter is where the math gets particularly demanding. Consensus currently estimates 3Q'26 DAUs at 60.7 million (+20.2% Y/Y). Swanson calculates that if Duolingo beats its own 3Q guide by 170 basis points, that would imply 58.0 million DAUs, requiring the company to add 2.7 million net DAUs quarter-over-quarter just to hit consensus. The three-year average for third-quarter Q/Q net adds is 2.9 million, so meeting that bar is feasible but tight. Replicating the scale of beat that DA Davidson now expects for 2Q'26 would demand something far harder: 3.4 to 3.5 million net Q/Q DAU adds in the third quarter. "Net adds of that magnitude would represent the largest Q/Q net adds in any 3Q in Duolingo's history," Swanson noted, with the previous third-quarter record standing at 3.1 million net adds in 3Q'24.

Against that backdrop, DA Davidson reiterated a Neutral rating and a $120 price target on DUOL, a level the firm says implies 15x its 2026 EBITDA estimate and 13x its 2027 EBITDA estimate. The firm's stance reflects a view that near-term DAU outperformance is likely but that the conditions for a sustained re-rating are not yet in place. Investors watching the stock into Duolingo's second-quarter earnings release will want to scrutinize not just the headline DAU figure but also any management commentary on 3Q engagement trends and whether the streak revival campaign has driven meaningful conversion to paid subscriptions. How Duolingo answers that question may determine whether the 2H'26 growth story holds.