VOL. XCIV, NO. 247
★ WIDE MOAT STOCKS COMPARISON ★
NO ADVICE
Wednesday, January 7, 2026
Stock Comparison
CoStar Group, Inc. vs Duolingo, Inc.
Compare moat strength, market structure, and segment coverage to understand how each company defends its edge.
CoStar Group, Inc.
CSGP · NASDAQ
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
Full stock profile
Dive deeper into CoStar Group, Inc.'s moat claims, evidence, and risks.
View CSGP analysisDuolingo, Inc.
DUOL · NASDAQ
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
Full stock profile
Dive deeper into Duolingo, Inc.'s moat claims, evidence, and risks.
View DUOL analysisComparison highlights
- Moat score gap: CoStar Group, Inc. leads (75 / 100 vs 68 / 100 for Duolingo, Inc.).
- Segment focus: CoStar Group, Inc. has 6 segments (39% in Multifamily (Apartments.com Network)); Duolingo, Inc. has 2 segments (93.9% in Duolingo App).
- Primary market structure: Oligopoly vs Competitive. Pricing power: Strong vs Moderate.
- Moat breadth: CoStar Group, Inc. has 9 moat types across 4 domains; Duolingo, Inc. has 6 across 3.
Primary market context
CoStar Group, Inc.
Multifamily (Apartments.com Network)
Online multifamily rental marketplaces and advertising
United States
Two-sided (renters + property managers/owners)
Marketplace (subscription advertising + workflow tools)
39%
Duolingo, Inc.
Duolingo App
Mobile-first, freemium language learning and adjacent subjects (math, music)
Global
Consumers (end-users); advertisers
Digital learning platform / content & software publisher
93.9%
Side-by-side metrics
Moat coverage
Shared moat types
CoStar Group, Inc. strengths
Duolingo, Inc. strengths
Segment mix
CoStar Group, Inc. segments
Full profile >CoStar (commercial real estate info & analytics)
Oligopoly
Information Services (lease management software + international info)
Competitive
Multifamily (Apartments.com Network)
Oligopoly
LoopNet (commercial property marketing marketplace)
Oligopoly
Residential (Homes.com + OnTheMarket)
Oligopoly
Other Marketplaces (Ten-X, Land.com, BizBuySell, etc.)
Competitive
Duolingo, Inc. segments
Full profile >Duolingo App
Competitive
Duolingo English Test
Oligopoly
Want the full wide moat stocks list?
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Proven models entering the expansion stage with unit economics that work.
View expansion-stage stocksCuration & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.