Duolingo, Inc. — FY 2023 Form 10-K
Reporting period: Fiscal year ended December 31, 2023. Although the request references 2023 Q4, this filing reports annual financial results; the supplied text does not provide a clear set of fourth-quarter revenue or profit figures. User metrics are reported for the three months ended December 31.
Business context
Duolingo operates a freemium learning platform, with subscription revenue as its primary source, alongside advertising, in-app purchases and the Duolingo English Test. It reported 88.4 million average monthly active users and 6.6 million paid subscribers in Q4 2023. The company also offers math, music and early-literacy products and introduced the AI-powered Duolingo Max tier in 2023.
Financial and operating metrics
| Metric | FY 2023 | FY 2022 | Change |
|---|---|---|---|
| Revenue | $531.1 million | $369.5 million | +44% |
| Subscription revenue | $404.7 million | $273.5 million | +48% |
| Gross margin | 73.2% | 73.1% | +0.1 percentage points |
| Operating loss | $13.3 million | $65.2 million | Loss narrowed |
| Net income (loss) | $16.1 million | $(59.6) million | Turned profitable |
| Adjusted EBITDA (non-GAAP) | $93.7 million | $15.5 million | Increased |
| Net cash from operating activities | $153.6 million | $53.7 million | Increased |
| Free cash flow (non-GAAP) | $144.3 million | $46.2 million | Increased |
Net income included $31.1 million of interest income, compared with $7.2 million in 2022; the company still recorded an operating loss. Stock-based compensation expense was $95.2 million, up from $73.8 million.
- Growth and engagement: Q4 MAUs rose 46% year over year to 88.4 million; DAUs rose 65% to 26.9 million, and the DAU/MAU ratio improved to 30.4% from 26.9%. Period-end paid subscribers increased 57% to 6.6 million.
- Bookings: Subscription bookings increased 49% to $495.5 million; total bookings increased 45% to $622.2 million. Bookings are not GAAP revenue and reflect customer purchases before revenue recognition.
- Revenue mix: Advertising contributed $49.9 million (up 11%); English Test revenue was $41.2 million (up 26%); in-app purchases were $34.7 million (up 94%).
- Liquidity: Cash and cash equivalents were $747.6 million at year-end, including $697.2 million in money market funds. Current assets were $897.8 million and current liabilities $277.4 million. Deferred revenue was $249.2 million.
- Debt and commitments: The balance sheet reports no borrowings or debt. Operating lease liabilities totaled $25.0 million. Total contractual obligations were $206.7 million, including $123.3 million in hosting and web-services commitments.
Material changes versus FY 2022
Revenue growth, improved operating expense leverage and higher interest income accompanied a shift from net loss to net income. Operating expenses rose 20%, slower than revenue growth of 44%; research and development remained the largest expense, increasing 29% to $194.4 million. Gross margin was essentially flat. Operating cash flow and free cash flow both increased substantially. Advertising pricing declined, partially offsetting growth in ad impressions.
Outlook, risks and unusual items
- The filing gives no quantified revenue, earnings or margin guidance. Management says existing cash and operating cash flow should fund working capital and capital expenditure needs for at least the next 12 months. It expects continued product and infrastructure investment; it expects R&D and sales and marketing to decline as a percentage of revenue over the long term.
- Management attributes user growth to product improvements, engagement initiatives and marketing. It identifies user retention and paid conversion, competition, new-product execution and maintaining profitability as significant uncertainties. Math and Music had not generated material revenue as of the filing.
- Platform concentration is material: Apple and Google app stores accounted for 59% and 20% of FY 2023 revenue, respectively. The company also relies on third-party cloud providers, including AWS and Google Cloud.
- Other key risks include privacy and data-protection regulation, cybersecurity, AI accuracy and regulation, international operations (including China), foreign exchange, and continued acceptance of the English Test. The company says it has not identified cybersecurity threats that materially affected it; it also discloses prior immaterial security incidents.
- No material legal proceedings were pending. The company reported no off-balance-sheet financing arrangements. A new New York office sub-sublease commenced in January 2024; related rent payments are scheduled to begin after a 20-month period.
- Tax expense and cash taxes are affected by the requirement to capitalize and amortize U.S. research and development costs under IRC Section 174. The company maintained a $156.9 million valuation allowance against U.S. federal and state deferred tax assets.
- The 10-K reports 79.7% of voting power held by directors, executives, 5% stockholders and affiliates through the dual-class structure. The company does not intend to pay dividends in the foreseeable future.
Investor facts to verify
- How much of reported growth and profitability is recurring, given the operating loss, $31.1 million of interest income and $95.2 million of stock-based compensation?
- Whether subscriber growth, retention and bookings continue to convert into recognized subscription revenue and cash flow.
- How app-store fees, distribution terms and customer-payment concentration affect revenue, margins and cash receipts.
- Whether Duolingo Max and newer learning products achieve adoption and monetization sufficient to justify investment.
- The scale and timing of office lease costs, hosting commitments, equity compensation and potential dilution.
- That operating metrics are company-calculated estimates and have not been validated by an independent third party; assess comparability if methodologies change.
The financial statements received an unqualified audit opinion, and management and the auditor reported effective internal control over financial reporting as of December 31, 2023.