ACI WORLDWIDE, INC. vs Duolingo, Inc.
Side-by-Side SaaS Metrics & Valuation Comparison
analyticsVertical SaaS
Data as of Q2 2026
Summary Verdict
ACIW: 1—DUOL: 4wins
Rule of 40
26.1ACIW
81.8DUOL
check_circleDUOL leads
Revenue Growth
9.1%ACIW
49.0%DUOL
check_circleDUOL leads
Gross Margin
46%ACIW
73%DUOL
check_circleDUOL leads
FCF Margin
17.0%ACIW
32.8%DUOL
check_circleDUOL leads
Operating Margin
15.2%ACIW
13.2%DUOL
check_circleACIW leads
NRR
—ACIW
—DUOL
Metric
Rule of 40Efficiency score
ACIW
26.1
DUOL
81.8check_circle
Revenue GrowthYoY
ACIW
9.1%
DUOL
49.0%check_circle
Gross Margin% of revenue
ACIW
46%
DUOL
73%check_circle
FCF MarginFree cash flow
ACIW
17.0%
DUOL
32.8%check_circle
Operating MarginGAAP
ACIW
15.2%check_circle
DUOL
13.2%
NRRNet retention
ACIW
N/A
DUOL
N/A
EV / RevenueValuation multiple
ACIW
3.3xcheck_circle
DUOL
5.2x
Market CapUSD
ACIW
$5.1B
DUOL
$6.6Bcheck_circle
ARR GrowthYoY
ACIW
N/A
DUOL
N/A
CAC PaybackMonths to recover
ACIW
N/A
DUOL
N/A
insights
Analysis
As of Q2 2026, ACI WORLDWIDE, INC. trades at 3.3x EV/Revenue versus Duolingo, Inc. at 5.2x. On the Rule of 40, ACI WORLDWIDE, INC. scores 26.1 compared to Duolingo, Inc.'s 81.8, placing Duolingo, Inc. ahead in operating efficiency. Gross margins stand at ACI WORLDWIDE, INC. 46% vs Duolingo, Inc. 73%.
Sector Context
Both companies operate in the Vertical SaaS sector. The median columns above show where each company stands relative to their peers.