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ZYBERNO
Stock Report
Updated Aug 30, 2026

Duolingo, Inc. (DUOL)

Technology • NASDAQ

$146.98
Duolingo Inc. is an American educational technology company headquartered in Pittsburgh, Pennsylvania, that offers language learning through its freemium application. Founded in 2011 by Luis von Ahn and Severin Hacker, Duolingo is the world's most downloaded education app with over 500 million registered users across more than 40 languages, operating a mobile-first gamified learning platform with a subscription tier (Duolingo Plus/Super) and additional courses in math and music.

Professional Investment Analysis

ZYBERNO SCORE →
Is it a great business? Is it getting better?
92.0/100
GREAT BUSINESS
Duolingo, Inc. (DUOL) scores 92/100 — exceptional capital returns and consistent cash generation across all measurement periods.
📊 How is the Zyberno Score calculated? +
VALUATION SIGNAL
MARGIN OF SAFETY
Is this stock cheap or expensive relative to what the business has historically generated for owners?
+54.8%
Undervalued
Is the market underestimating or overestimating what this business is capable of going forward?
-6.0%
Slight Overestimate
↑ UNDER
+50%
Brina Gap
-50%
↓ OVER
← OVERVALUED
-100%
Margin of Safety
UNDERVALUED →
+100%
UNDERESTIMATED
GROWTH
DOUBLE
DISCOUNT
EXPENSIVE
HYPE
VALUE
TRAP
0,0
MoS +54.8%  ·  Gap -6.0%

Two independent signals. One tells you if the stock is cheap relative to what the business has historically generated for owners — the Margin of Safety. The other tells you if the market is underestimating what the business is capable of going forward — the Brina Gap.

They are calculated from completely different data sources and answer completely different questions. The Margin of Safety reads the past. The Brina Gap reads the present economics and compares them against what the current stock price is assuming about the future.

When both point in the same direction simultaneously — DOUBLE DISCOUNT — the probability of genuine mispricing is high. The market is wrong on two independent dimensions at once, which is rare and significant.

The most dangerous scenario is not an overvalued stock — those are easy to avoid. It is a VALUE TRAP: a stock that appears cheap historically but where the market is already pricing in stronger growth than the business fundamentals support. Without the Brina Gap signal this looks identical to a genuine opportunity. The matrix separates them instantly.

The Brina Gap is the more powerful of the two signals. Most investors and analytical tools focus on valuation alone — whether a stock is cheap relative to earnings. Far fewer systematically compare what the business economics structurally support against what the stock price is actually assuming. That gap between fundamental growth potential and market expectations is where the most reliable mispricings live, and where this matrix earns its value.

Use this as your first filter. A stock in DOUBLE DISCOUNT territory is worth investigating. Everything else requires either more caution or a specific reason to act.

VALUE TRAP SIGNAL
Duolingo, Inc. (DUOL) appears cheap historically (Margin of Safety +54.8%) but the Brina Gap (-6.0%) shows the market already prices in stronger growth than fundamentals support. Verify before acting.
🎯 Expected Annual Return →
40.6%
Margin of Safety convergence — your return if the market re-prices to intrinsic value (5-yr annualised)
2.0%
Brina Gap convergence — your return if the market corrects the growth mispricing the Gap measures
18.6%
Yield + growth — what the business alone earns you, even if the market never re-rates
💰 How is Margin of Safety calculated? +
📈 How is Brina Gap calculated? +

Critical Financial Health Indicators

Return on Equity (Profitability):EXCELLENT (30.1%)
Debt-to-Equity (Solvency Risk):EXCELLENT (0.13x)
Operating Margin (Operational Efficiency):AVERAGE (13.7%)
Return on Capital (Capital Efficiency):EXCELLENT (36.0%)
📊 Valuation Trilogy
Three interconnected metrics for complete valuation analysis
💎
Intrinsic Value
DCF Fair Value
$325.04
🛡️
Margin of Safety
Valuation Gap
54.8%
🎯
Expected Return
Projected Annual
40.6%
Click any metric for full methodology and detailed analysis
Zyberno's Verdict

According to Zyberno, Duolingo, Inc. (DUOL) shows a Value Trap signal — GREAT BUSINESS (92/100) with an apparent Margin of Safety of +54.8%, but a Brina Gap of -6.0% reveals the current price still assumes faster growth than the business can deliver.

According to Zyberno's DCF model, Duolingo, Inc. (DUOL) trades at $146.98 against an estimated intrinsic value per share of $325.04 — a +54.8% Margin of Safety based on Owner Earnings of $424.27M TTM, projected at 98.1% growth for 10 years with a 2.5% terminal growth rate. The Brina Gap of -6.0% weakens the case: based on the company's ROIC (36.0%) and reinvestment rate (32.1%), the business can fundamentally grow at 11.5% — but the current enterprise value implies the market expects 17.6%. This places DUOL in the Value Trap quadrant of the Brina Matrix — a value-trap signal where the apparent discount is undermined by overpriced growth expectations. Zyberno's model translates this into a 5-year expected return of 40.6% annually.

Over the trailing twelve months, DUOL generated $424.27M in Owner Earnings. Capital was deployed as follows: $24.33M returned via share buybacks, $16.92M invested in capital expenditures. Reinvestment rate: 32.1%. Owner Earnings have grown at 98.1% annually over the trailing five years using log-linear regression.

DIVISION I: EXECUTIVE SUMMARY
A. Market Valuation

Market Price & Capitalization (2)

Current Price:146.98
Market Cap:$5.97B

Valuation Multiples (4)

P/E Ratio:
17.31x
📊 Click to view full DUOL P/E analysis →
P/B Ratio:4.23x
P/S Ratio:5.21x
Peg Ratio:0.07x

Enterprise Metrics (3)

Enterprise Value:$4.88B
Ev Ebitda Ratio:28.45x
Pfcf Ratio:14.35x

Price Action & Momentum (3)

12-1 Momentum:
-64.7% (3th pctile)
📈 Click to view full DUOL Momentum analysis →
Momentum Percentile:3 / 100
% of 52-Week High:41.6%
B. Profitability Assessment

Return Metrics (7)

ROE:
30.1%
📊 Click to view full DUOL ROE analysis →
ROA:20.5%
Roic:
36.0%
📊 Click to view full DUOL ROIC analysis →
Reinvestment Rate:32.1%
Fundamental Growth Rate (g):11.5%
Market-Implied Growth Rate:17.6%
Brina Gap:
-6.0%
☷ Click to view full DUOL Brina Gap analysis →

Margin Analysis (3)

Operating Margin Ttm:13.7%
Net Margin Ttm:35.9%
Ebitda Margin:15.0%

TTM Performance (3)

Gross Margin Ttm:72.7%
Operating Margin Ttm:13.7%
Net Margin Ttm:35.9%

Yield Metrics (3)

Earnings Yield:$5.78
Owner Earnings Yield:$7.11
Dividend Yield:0.0%
C. Log-Linear Regression Growth Trends

Earnings Surprise (SUE) (3)

Earnings Surprise (SUE):
-0.73
📊 Click to view full DUOL Earnings Surprise analysis →
EPS Surprise vs Expected:-58.8%
Latest Earnings Filed:2026-08-06

Revenue Growth (Linear) (1)

Revenue Growth Rate (Linear):37.6%

Earnings Growth (Linear) (1)

Net Income Growth Rate (Linear):100.0%

Cash Flow Growth (Linear) (2)

Free Cash Flow Growth Rate (Linear):99.1%
Operating Cash Flow Growth Rate (Linear):94.3%

Operating Growth (Linear) (1)

Operating Income Growth Rate (Linear):68.6%
D. Financial Stability

Liquidity Ratios (3)

Current Ratio:2.72x
Quick Ratio:2.72x
Cash Ratio:2.04x

Leverage Analysis (3)

Debt To Equity Ttm:0.13x
Debt-to-Equity Ratio:0.13x
Debt To Ebitda:0.53x

Coverage Ratios (1)

Times Interest Earned:-999.00

Capital Structure (4)

Working Capital:993,281,000.00
Cash And Cash Equivalents:1,180,887,000.00
Long Term Debt:$86.14M
Net Debt:-$1.09B
DIVISION II: FINANCIAL STATEMENTS ANALYSIS
A. Income Statement Analysis

Revenue Components (2)

Revenue TTM: $1.15B
Linear Growth: 37.6%
📊 Click to view full DUOL Revenue analysis & methodology →
Cost Of Revenue Ttm:$312.39M

Profitability Breakdown (2)

Gross profit TTM: $832.62M
Linear Growth: 37.2%
📊 Click to view full DUOL Gross Profit analysis & methodology →
Operating income TTM: $157.09M
Linear Growth: 68.6%
📊 Click to view full DUOL Operating Income analysis & methodology →

Bottom Line Performance (3)

Net income TTM: $410.77M
Linear Growth: 100.0%
📊 Click to view full DUOL Net Income analysis & methodology →
Income Before Tax:$201.87M
Ebitda Ttm:171,522,000.00

Operating Expenses (5)

Operating Expenses:675,531,000.00
R And D Expense:337,432,000.00
Sga Expense:189,391,000.00
Income Tax Expense:-$207.36M
Interest Expense:0.00

Expense Ratios (3)

R And D To Revenue Percentage:113.1%
Sga To Revenue Percentage:63.5%
Ebitda Margin:15.0%
B. Balance Sheet Analysis

Asset Composition (5)

Total Assets:$2.07B
Current Assets:$1.57B
Ppe Net:42,619,000.00
Goodwill:35,335,000.00
Intangible Assets:$27.60M

Liability Structure (4)

Total Liabilities:664,211,000.00
Current Liabilities:577,833,000.00
Long Term Debt:$86.14M
Short Term Debt:$4.07M

Equity & Capital (3)

Equity:$1.41B
Retained Earnings:$364.84M
Common Stock:5,000.00

Working Capital Items (3)

Accounts Receivable:130,979,000.00
Inventory:0.00
Accounts Payable:55,429,000.00

Special Items (2)

Contract Liabilities:505,102,000.00
Stock Based Compensation:38,210,000.00
C. Cash Flow Analysis

Operating Activities (2)

Operating cash flow TTM: $432.96M
Linear Growth: 94.3%
Free cash flow TTM: $416.04M
Linear Growth: 99.1%
📊 Click to view full DUOL Free Cash Flow analysis & methodology →

Investment Activities (2)

Investing Cash Flow:-$16.75M
Capital Expenditures Ttm:16,919,000.00

Financing Activities (3)

Financing Cash Flow:-$31.85M
Dividends Paid Ttm:0.00
Stock Repurchase:24,331,000.00

Capital Transactions (3)

Common Stock Issuance:0.00
Long Term Debt Issuance:$0.00
Long Term Debt Repayments:$0.00

Non-Cash Items (1)

Depreciation Amortization Ttm:14,437,000.00
DIVISION III: OPERATIONAL METRICS
A. Per Share Analysis

Earnings Per Share (3)

EPS (Basic TTM):8.93
Eps diluted TTM: $8.49
Linear Growth: 100.0%
📊 Click to view full DUOL EPS analysis & methodology →
Earnings Per Share Ttm:$10.11

Revenue & Cash Per Share (3)

Sales Per Share Ttm:28.19
Operating Cash Flow Per Share:$9.55
Fcf Per Share Ttm:10.24

Book Value & Capital (2)

Book Value Per Share:$34.71
Cash Per Share:29.07

Dividend Policy (1)

Dividend Payout Ratio:0.00x
B. Operational Efficiency

Asset Utilization (2)

Asset Turnover Ttm:0.57x
Working Capital Turnover Ttm:1.15x

Receivables Management (2)

Receivables Turnover Ttm:8.74x
Days Sales Outstanding Ttm:41.75

Inventory Management (2)

Inventory Turnover Ttm:-999.00x
Days Inventory Outstanding Ttm:-999.00

Payables & Cash Cycle (2)

Days Payable Outstanding:64.76
Cash Conversion Cycle:-1,022.01
C. Quality & Risk Metrics

Financial Quality Scores (2)

Financial Strength Score:100.00
Quality Score:85.00

Market Metrics (2)

Beta:0.00x
Volatility Category:unknown
DIVISION IV: INVESTMENT ANALYSIS
A. Value Investment Framework

Owner Earnings Analysis (3)

Owner earnings TTM: $424.27M
Linear Growth: 98.1%
📊 Click to view full DUOL Owner Earnings analysis & methodology →
Owner Earnings Per Share:$10.45
Owner Earnings Yield:$7.11

Growth Assessment (1)

Owner Earnings Growth Rate:$98.10

Damodaran Growth Analysis (4)

Reinvestment Rate:32.1%
Fundamental Growth Rate (g):11.5%
Market-Implied Growth Rate:17.6%
Brina Gap:
-6.0%
☷ Click to view full DUOL Brina Gap analysis →

Intrinsic Value Models (1)

Intrinsic Value:
$13.20B
📊 Click to view full DUOL DCF valuation →

Margin of Safety (1)

Margin Of Safety:
54.8%
📊 Click to view full DUOL valuation analysis →

Return Scenarios (2)

Theoretical 5-Year Return:
40.6%
📊 Click to view full DUOL expected return analysis →
Forward Expected Return (Yield + Growth):
18.6%
📊 Click to view full DUOL expected return analysis →

Investment Assessment (1)

Buffett Assessment:Excellent margin of safety
B. Log-Linear Regression Growth Analysis

Growth Rates (Log-Linear Regression) (3)

Revenue Growth Rate (Linear):37.6%
Net Income Growth Rate (Linear):100.0%
Operating Income Growth Rate (Linear):68.6%

Cash Flow Growth Rates (2)

Free Cash Flow Growth Rate (Linear):99.1%
Operating Cash Flow Growth Rate (Linear):94.3%

Other Growth Rates (3)

Gross Profit Growth Rate (Linear):37.2%
Book Value Growth Rate (Linear):29.5%
Owner Earnings Growth Rate:$98.10
C. Company Profile & Context

Corporate Information (6)

Symbol:DUOL
Company Name:Duolingo, Inc.
Sector:Technology
Industry:Software
Exchange:NASDAQ
Country:United States

Market Classification (3)

Market Cap Category:N/A
Price Category:high
Volume Category:N/A

Share Structure (3)

Shares Outstanding:40.62M
Shares Outstanding Basic:40.62M
Shares Outstanding Diluted:50.03M

Data Processing Info (3)

Processing Version:v3.0
Last Updated:2026-08-30 03:41:18 UTC
Data Timestamp:2026-08-30T03:41:18.985117
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