B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
34
34 -- median annual a b tests run for companies running A/B tests (2026)
The median company runs 34 A/B tests per year.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
34
Unit
Count
Data Vintage
2026
Entity
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Optimizely
Primary
Tier C
https://kirro.io/client-side-vs-server-side-a-b-testing ↗
Source Article
Server side testing vs client side: the honest comparison
Client-side testing changes what visitors see inside the browser. Server side testing decides what to send before the page even loads. That’s the core difference between client side vs server side A/B testing.
For most small businesses testing headlines, buttons, and landing pages, client-side does …
Original Research
Optimizely
· Original study ↗
Methodology
Cited by Kirro, attributed to Optimizely experiment analysis
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
companies running A/B tests: 34 median annual a b tests run. Source: Optimizely (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/median-tests-per-year
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<blockquote cite="https://lighthousedata.io/data/median-tests-per-year" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>34</strong> -- median annual a b tests run for companies running A/B tests<br><small>Source: Optimizely (2026) · <a href="https://lighthousedata.io/data/median-tests-per-year" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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