Duolingo, Inc.

0000001 - Document - Cover Page

0000002 - Document - Audit Information

9952151 - Statement - CONSOLIDATED BALANCE SHEETS

9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)

9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

9952154 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS??? EQUITY

9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS

9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

9952157 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

9952158 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9952159 - Disclosure - FAIR VALUE

9952160 - Disclosure - ACQUISITIONS

9952161 - Disclosure - REVENUE

9952162 - Disclosure - PROPERTY and EQUIPMENT, net

9952163 - Disclosure - INTANGIBLE ASSETS AND GOODWILL

9952164 - Disclosure - LEASES

9952165 - Disclosure - INCOME TAXES

9952166 - Disclosure - STOCK-BASED COMPENSATION

9952167 - Disclosure - COMMITMENTS AND CONTINGENCIES

9952168 - Disclosure - EMPLOYEE BENEFIT PLAN

9952169 - Disclosure - EARNINGS (LOSS) PER SHARE

9952170 - Disclosure - SUBSEQUENT EVENTS

995410 - Disclosure - Pay vs Performance Disclosure

995445 - Disclosure - Insider Trading Arrangements

995447 - Disclosure - Insider Trading Policies and Procedures

995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure

9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9955513 - Disclosure - FAIR VALUE (Tables)

9955514 - Disclosure - ACQUISITIONS (Tables)

9955515 - Disclosure - REVENUE (Tables)

9955516 - Disclosure - PROPERTY and EQUIPMENT, net (Tables)

9955517 - Disclosure - INTANGIBLE ASSETS AND GOODWILL (Tables)

9955518 - Disclosure - LEASES (Tables)

9955519 - Disclosure - INCOME TAXES (Tables)

9955520 - Disclosure - STOCK-BASED COMPENSATION (Tables)

9955521 - Disclosure - EARNINGS (LOSS) PER SHARE (Tables)

9955522 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details)

9955523 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

9955524 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Useful Life (Details)

9955525 - Disclosure - FAIR VALUE - Schedule of Net Unrealized Gains (Losses), and Fair Value by Major Security Type for Our Investments (Details)

9955526 - Disclosure - FAIR VALUE - Narrative (Details)

9955527 - Disclosure - ACQUISITIONS - Narrative (Details)

9955528 - Disclosure - ACQUISITIONS - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)

9955529 - Disclosure - REVENUE - Narrative (Details)

9955530 - Disclosure - REVENUE - Schedule of Disaggregation of Revenue (Details)

9955531 - Disclosure - REVENUE - Schedule of Revenue by Geographic Areas (Details)

9955532 - Disclosure - REVENUE - Schedule of Deferred Revenues (Details)

9955533 - Disclosure - PROPERTY and EQUIPMENT, net - Schedule of Property and Equipment (Details)

9955534 - Disclosure - PROPERTY and EQUIPMENT, net - Schedule of Depreciation Expense (Details)

9955535 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details)

9955536 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Narrative (Details)

9955537 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets Amortization Expense (Details)

9955538 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets, Future Amortization Expense (Details)

9955539 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Goodwill (Details)

9955540 - Disclosure - LEASES - Narrative (Details)

9955541 - Disclosure - LEASES - Schedule of Components of Lease Cost (Details)

9955542 - Disclosure - LEASES - Schedule of Future Minimum Rental Payments for Operating Leases (Details)

9955543 - Disclosure - INCOME TAXES - Income Before Income Tax, Domestic and Foreign (Details)

9955544 - Disclosure - INCOME TAXES - Provision of Income Taxes (Details)

9955545 - Disclosure - INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)

9955546 - Disclosure - INCOME TAXES - Deferred Tax Assets and Liabilities (Details)

9955547 - Disclosure - INCOME TAXES - Narrative (Details)

9955548 - Disclosure - INCOME TAXES - Valuation Allowance (Details)

9955549 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details)

9955550 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Stock Option Activity (Details)

9955551 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Restricted Stock Unit Activity (Details)

9955552 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Payment Award (Details)

9955553 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Weighted Average Pricing Model (Details)

9955554 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Income Statement Location for Compensation Expense (Details)

9955555 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)

9955556 - Disclosure - EMPLOYEE BENEFIT PLAN (Details)

9955557 - Disclosure - EARNINGS (LOSS) PER SHARE - Narrative (Details)

9955558 - Disclosure - EARNINGS (LOSS) PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details)

9955559 - Disclosure - EARNINGS (LOSS) PER SHARE - Schedule of Antidilutive Securities (Details)