B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
39%
39% -- agency test win rate for CRO agencies (CXL experiment analysis) (2025)
CXL's analysis of 28,304 experiments found that agencies produce clear winners in about 39% of tests.
- The source notes this is 'about 39%'
Attribution:
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Lighthouse Research Team
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Source verified
Evidence graded
Value
39%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
28,304
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
CXL
Primary
Tier B
https://kirro.io/ab-testing-agency ↗
Source Article
A/B Testing Agency: Costs, Red Flags, and Alternatives
Most small businesses don’t need an A/B testing agency. They need a decent tool and a few hours a month.
That’s not what agencies want you to hear. But the math is pretty clear: unless you’re doing $250K+ in monthly revenue with 50,000+ visitors, an agency’s retainer eats most of the gains it produc…
Original Research
CXL
· Original study ↗
Methodology
Analysis of 28,304 experiments
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
CRO agencies (CXL experiment analysis): 39% agency test win rate. Source: CXL (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/cxl-agency-test-win-rate
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<blockquote cite="https://lighthousedata.io/data/cxl-agency-test-win-rate" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- agency test win rate for CRO agencies (CXL experiment analysis)<br><small>Source: CXL (2025) · <a href="https://lighthousedata.io/data/cxl-agency-test-win-rate" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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