Duolingo, Inc. annual report, FY2021

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Duolingo, Inc. — FY2021 Form 10-K

Reporting period: Fiscal year ended December 31, 2021, compared with FY2020. Although the request specifies 2021 Q4, this filing is an annual report. It provides selected Q4 operating metrics, but does not provide a clear standalone Q4 income statement, cash flow, or balance-sheet comparison in the supplied text.

Business context and operating metrics

Duolingo operates a freemium language-learning platform, monetized primarily through subscriptions, advertising, in-app purchases, and the Duolingo English Test. It also offers Duolingo ABC. At year-end, the language app had about 42 million monthly active users and courses in more than 40 languages. The company completed its IPO in July 2021.

  • Q4 average MAUs were 42.4 million, up 15% year over year; average DAUs were 10.1 million, up 20%. DAU/MAU engagement rose to 23.8% from 22.8%.
  • Paid subscribers reached 2.5 million at December 31, up 56% from 1.6 million a year earlier.
  • FY2021 subscription bookings were $224.5 million, up 56%; total bookings were $294.2 million, up 55%. Bookings are a non-GAAP operating metric and are not equivalent to recognized revenue.

Financial performance and liquidity

Amounts below are in U.S. dollars; financial-statement figures are rounded to millions.

  • Revenue: $250.8 million, up 55% from $161.7 million. Subscription revenue was $180.7 million (+54%), advertising $38.5 million (+42%), Duolingo English Test $24.7 million (+63%), and other revenue $6.9 million (+246%).
  • Profitability and margins: Gross profit was $181.6 million; gross margin improved to 72.4% from 71.6%. Operating loss was $60.0 million versus $16.0 million; net loss was $60.1 million versus $15.8 million. Adjusted EBITDA, a non-GAAP measure, was negative $1.1 million versus positive $3.6 million. Net loss per share was $2.57 versus $1.24.
  • Costs: Operating expenses rose 83% to $241.6 million, faster than revenue. Research and development increased 96% to $103.8 million; sales and marketing rose 69% to $59.2 million; general and administrative rose 80% to $78.6 million.
  • Cash flow: Operating cash flow was $9.2 million, down from $17.7 million. Investing cash outflow was $6.2 million. Free cash flow, as defined by the company, was $12.7 million versus $14.0 million.
  • Liquidity and obligations: Cash and cash equivalents were $553.9 million at year-end, versus $120.5 million. Current assets were $619.3 million and current liabilities $119.1 million. The company said existing cash and operating cash flow should fund working capital and capital expenditures for at least 12 months. No borrowings are shown on the supplied balance sheet; operating lease liabilities totaled $32.5 million, with $44.4 million of undiscounted lease commitments and $23.0 million of hosting commitments.

Material changes, outlook, and unusual items

  • Revenue growth reflected higher average paid subscribers, advertising revenue, English Test volume and in-app purchases. The company attributed user growth to product improvements, engagement initiatives and marketing.
  • Management said expense growth outpaced revenue and gross profit, driving the decline in Adjusted EBITDA. It expects continued investment in research and development, infrastructure, products and employees; public-company costs are also expected to add to general and administrative expenses. No specific revenue or earnings guidance is provided in the supplied filing text.
  • The IPO generated $426.2 million of net proceeds recorded in financing cash flows. FY2021 net loss included $40.8 million of stock-based compensation, including IPO-related vesting costs and founder awards. The first two tranches of founder performance-based RSUs met their stock-price hurdles; estimated total compensation expense for the founder awards was approximately $110.8 million over their derived service periods.
  • A 2021 employee tender offer and related costs, plus one-time contributor awards of approximately $4.2 million, were unusual expenses. The company ended its non-employee volunteer contributor program.
  • Management reported no material negative operating or financial impact from COVID-19 to date, while noting that the pandemic had increased certain user and financial metrics in 2020. It expects the English Test’s increased acceptance during the pandemic to persist.

Risks and contingencies

  • Growth and monetization depend on retaining and engaging users and converting free users to paid subscriptions, amid intense competition and low switching costs.
  • Distribution and payment are concentrated in Apple and Google platforms; in 2021 they accounted for 50% and 20% of revenue, respectively. The company also relies heavily on AWS and Google Cloud; an AWS outage took Duolingo offline for more than five hours on December 7, 2021.
  • Privacy, data security, changing regulation, advertising-platform policies, and international operations present material risks. In China, the app became unavailable for download on most app stores in fall 2021; the company believed this was temporary and was in discussions with authorities.
  • The company reported no material legal proceedings, but disclosed potential sales/use and VAT liabilities in multiple jurisdictions while pursuing voluntary disclosure agreements; additional amounts could be due.
  • Dual-class shares concentrated 92.4% of voting power with pre-listing holders and affiliates at year-end. Management said a previously identified internal-control material weakness was remediated as of December 31, 2021; the company was not required to obtain an auditor attestation on internal controls.

Investor verification priorities

  • Confirm the standalone Q4 financial results and trends from quarterly disclosures; the annual filing’s selected Q4 metrics do not establish Q4 revenue or profitability.
  • Track whether subscription growth, renewals and paid conversion sustain revenue growth, and reconcile bookings with recognized revenue and deferred revenue.
  • Assess the trajectory of operating expenses, GAAP losses, stock-based compensation and founder awards, including the impact of further share dilution.
  • Review cash generation and liquidity alongside lease and hosting commitments, and verify whether cash-flow improvement depends materially on deferred-revenue timing.
  • Monitor reliance on app stores and cloud providers, China app availability, privacy/regulatory exposure, and the status of sales and VAT assessments.
  • Review future internal-control reporting and the effects of the dual-class voting structure on shareholder influence.