DUOL
Duolingo, Inc.
DUOL offers stronger valuation, but that advantage does not outweigh its weaker overall profile.
SNDK
Sandisk Corporation
SNDK has the edge over DUOL overall, supported by stronger modeled upside and stronger fundamentals.
DUOL Fundamentals
| Metric | Status |
|---|---|
| Healthy | |
| Stable | |
| Strong | |
| Strong |
DUOL's revenue, cash flow and balance sheet are currently healthy, and its profitability is stable.
SNDK Fundamentals
| Metric | Status |
|---|---|
| Strong | |
| Strong | |
| Strong | |
| Strong |
SNDK's revenue, profitability, cash flow and balance sheet are all currently strong.
DUOL PE Valuation
| Level | PE | Price | Vs current |
|---|---|---|---|
| Cheap | 15x | $46.37 | -71% |
| Current | 51x | $157 | — |
| Forward | 51x | $157 | — |
| Fair | 151x | $464 | +195% |
| Expensive | 207x | $637 | +305% |
Historical ranges are pointers, not guarantees.
DUOL's PE is in its fair range at 51.1x. On analysts' estimates for next year's earnings, today's price would be 51.4x.
SNDK PE Valuation
| Level | PE | Price | Vs current |
|---|---|---|---|
| Forward | 3.8x | $937 | — |
| Current | 7.5x | $937 | — |
| Cheap | 17x | $2,173 | +132% |
| Fair | 24x | $3,048 | +225% |
| Expensive | 59x | $7,452 | +695% |
Historical ranges are pointers, not guarantees.
SNDK has the edge over DUOL in the historical PE scenario, which offers more potential upside but is not a forecast.
DUOL Forward outlook
| Metric | Outlook |
|---|---|
| Stable | |
| Growth | |
| Growth | |
| Weakening | |
| Limited | |
| Low |
Analysts expect earnings and revenue growth for DUOL, but weaker profitability. However, they disagree widely on these estimates.
SNDK Forward outlook
| Metric | Outlook |
|---|---|
| Strongly improving | |
| Strong growth | |
| Strong growth | |
| Strongly improving | |
| Moderate | |
| High |
SNDK has the edge over DUOL on the outlook, with more favorable valuation and profitability expectations.
DUOL Earnings Per Share
| Quarter | TTM EPS | YoY |
|---|---|---|
| Forward | $3.07 | -0.5% |
| Q3 2026 | $3.08 | -61% |
| Q2 2026 | $8.49 | +249% |
| Q1 2026 | $8.74 | +331% |
| Q4 2025 | $8.57 | +356% |
| Q3 2025 | $7.89 | +329% |
| Q2 2025 | $2.43 | +72% |
| Q1 2025 | $2.03 | +107% |
| Q4 2024 | $1.88 | +437% |
DUOL earned $3.08 per share over the past year, down 61% from the year before.
SNDK Earnings Per Share
| Quarter | TTM EPS | YoY |
|---|---|---|
| Forward | $247.30 | +97% |
| Q3 2026 | $125.61 | +$137.63 |
| Q2 2026 | $73.76 | +$85.07 |
| Q2 2025 | -$11.31 | -$6.65 |
SNDK has the edge over DUOL in the latest year-over-year earnings comparison.
DUOL Quarterly Revenue
| Quarter | Revenue | YoY |
|---|---|---|
| Q3 2026 | $309M | +14% |
| Q2 2026 | $298.5M | +18% |
| Q1 2026 | $292M | +27% |
| Q4 2025 | $282.9M | +35% |
| Q3 2025 | $271.7M | +41% |
| Q2 2025 | $252.3M | +41% |
| Q1 2025 | $230.7M | +38% |
| Q4 2024 | $209.6M | +39% |
DUOL's revenue has grown year over year every quarter since late 2020: $309M last quarter, up 14% from the same quarter a year ago.
| Quarter | Margin | YoY |
|---|---|---|
| Q3 2026 | 7.8% | -5.1 points |
| Q2 2026 | 11% | -1.9 points |
| Q1 2026 | 15% | +5 points |
| Q4 2025 | 15% | +8.7 points |
| Q3 2025 | 13% | +5.9 points |
| Q2 2025 | 13% | +2.7 points |
| Q1 2025 | 10% | +0.4 points |
| Q4 2024 | 6.6% | +3.4 points |
DUOL's operating margin was 7.8% last quarter, down 5.1 points from the same quarter a year ago.
SNDK Quarterly Revenue
| Quarter | Revenue | YoY |
|---|---|---|
| Q3 2026 | $11B | +378% |
| Q2 2026 | $9B | +372% |
| Q1 2026 | $6B | +251% |
| Q4 2025 | $3B | +61% |
| Q3 2025 | $2.3B | +23% |
| Q2 2025 | $1.9B | +8% |
| Q1 2025 | $1.7B | -0.6% |
| Q4 2024 | $1.9B | +13% |
SNDK's revenue has grown year over year for six quarters in a row: $11B last quarter, up 378% from the same quarter a year ago.
| Quarter | Margin | YoY |
|---|---|---|
| Q3 2026 | 80% | +72 points |
| Q2 2026 | 78% | +78 points |
| Q1 2026 | 69% | +180 points |
| Q4 2025 | 35% | +25 points |
| Q3 2025 | 7.6% | -9 points |
| Q2 2025 | 0.9% | N/A |
| Q1 2025 | -111% | -122 points |
| Q4 2024 | 10% | +6.6 points |
SNDK has the edge over DUOL on profitability, with a higher operating margin.
DUOL Free Cash Flow
| Quarter | Free cash flow | YoY |
|---|---|---|
| Q3 2026 | $78.5M | -1.1% |
| Q2 2026 | $81.4M | -9.1% |
| Q1 2026 | $150.6M | +44% |
| Q4 2025 | $96.6M | +19% |
| Q3 2025 | $79.4M | +50% |
| Q2 2025 | $89.5M | +57% |
| Q1 2025 | $104.3M | +27% |
| Q4 2024 | $81.4M | +69% |
DUOL generated $407M in free cash flow over the past year, up 15% from the year before.
SNDK Free Cash Flow
| Quarter | Free cash flow | YoY |
|---|---|---|
| Q3 2026 | $6.3B | +1340% |
| Q2 2026 | $7.1B | +14355% |
| Q1 2026 | $3B | +$3B |
| Q3 2025 | $438M | +$636M |
| Q2 2025 | $49M | +$217M |
| Q1 2025 | -$18M | +$23M |
| Q3 2024 | -$198M | -$157M |
SNDK has the edge over DUOL on cash flow, with more consistent year-over-year improvement.
DUOL Total Shares
| Period | Change % | Net change |
|---|---|---|
| Quarterly | -0.2% | -101K shares |
| 1 year | +1.6% | +786K shares |
| 3 years | +6.4% | +3M shares |
| 5 years | +279% | +36.8M shares |
| Available history | +39% | +14M shares |
DUOL has the edge over SNDK on shareholder dilution, with a more favorable share count trend.
| Quarter | Spent |
|---|---|
| Q3 2026 | $6.9M |
| Q2 2026 | $45.3M |
| Q1 2026 | $24.3M |
| Q4 2022 | — |
| Q3 2022 | — |
| Q2 2022 | — |
| Q1 2022 | — |
| Q4 2021 | — |
SNDK Total Shares
| Period | Change % | Net change |
|---|---|---|
| Quarterly | -0.6% | -1M shares |
| 1 year | +3.4% | +5M shares |
| 3 years | +6.9% | +10M shares |
SNDK has 154M diluted shares, up 3.4% from a year ago.
| Quarter | Spent |
|---|---|
| Q3 2026 | $5B |
| Q3 2024 | — |
| Q2 2024 | — |
| Q1 2024 | — |
| Q4 2023 | — |
| Q3 2023 | — |
DUOL Net Leverage
| Quarter | Net Leverage | Status |
|---|---|---|
| Q3 2026 | -7.6x | Net Cash |
| Q2 2026 | -6.8x | Net Cash |
| Q1 2026 | -6.6x | Net Cash |
| Q4 2025 | -6.9x | Net Cash |
| Q3 2025 | -8.4x | Net Cash |
| Q2 2025 | -10.0x | Net Cash |
| Q1 2025 | -10.8x | Net Cash |
| Q4 2024 | -10.7x | Net Cash |
DUOL has the edge over SNDK on leverage, with a lower net debt burden relative to earnings.
SNDK Net Leverage
| Quarter | Net Leverage | Status |
|---|---|---|
| Q3 2026 | -0.2x | Net Cash |
| Q2 2026 | -0.4x | Net Cash |
| Q1 2026 | -0.7x | Net Cash |
SNDK has more cash than debt.
DUOL Weekly Momentum
| Metric | Value | Status |
|---|---|---|
| RSI | 57.9 | Neutral |
| Stochastic | 58.5 | Neutral |
DUOL's weekly RSI is 58 (neutral) and its Stochastic is 59 (neutral).
SNDK Weekly Momentum
| Metric | Value | Status |
|---|---|---|
| RSI | 40.2 | Neutral |
| Stochastic | 10.6 | Oversold |
SNDK's weekly RSI is 40 (neutral) and its Stochastic is 11 (oversold).
DUOL PE vs Technology Sector
| Metric | DUOL | Sector median | Relative |
|---|---|---|---|
| PE | 51x | 28x | 83% above |
| PE % | 37 | 44 | 7 pts below |
DUOL is trading at 51x earnings, a 83% premium to the Technology sector's median of 28x.
SNDK PE vs Technology Sector
| Metric | SNDK | Sector median | Relative |
|---|---|---|---|
| PE | 7.5x | 28x | 73% below |
| PE % | 4 | 27 | 23 pts below |
SNDK has the edge over DUOL on valuation relative to its sector.
DUOL Weekly Moving Averages
| Moving average | MA price | Relative |
|---|---|---|
| 8 week MA | $146.5 | 7.5% above |
| 20 week MA | $140.5 | 12% above |
| 50 week MA | $132.5 | 19% above |
| 100 week MA | $241.7 | 35% below |
| 200 week MA | $215.7 | 27% below |
DUOL has stronger trend alignment. DUOL is above 3 of 5 weekly averages versus SNDK above 0 of 3.
SNDK Weekly Moving Averages
| Moving average | MA price | Relative |
|---|---|---|
| 8 week MA | $1,317.5 | 29% below |
| 20 week MA | $1,465.4 | 36% below |
| 50 week MA | $1,119.6 | 16% below |
SNDK is in a downtrend: it's below all three of its weekly moving averages, and 16% below its 50-week average.
DUOL Yearly ROI
| Year | Start price | End price | ROI |
|---|---|---|---|
| 2021 | $140.3 | $109.0 | -22% |
| 2022 | $109.0 | $70.7 | -35% |
| 2023 | $70.7 | $226.9 | +221% |
| 2024 | $226.9 | $333.3 | +47% |
| 2025 | $333.3 | $181.7 | -46% |
| 2026 YTD | $181.7 | $157.4 | -13% |
DUOL's yearly returns have swung widely, from +221% in 2023 to −46% in 2025. It's down 13% so far in 2026.
SNDK Yearly ROI
| Year | Start price | End price | ROI |
|---|---|---|---|
| 2025 | $50.4 | $250.1 | +396% |
| 2026 YTD | $250.1 | $937.5 | +275% |
SNDK has the edge over DUOL on returns for 2026, with the stronger performance.