As of October 15, 2026, Optimizely is used by 87,369 websites in the TechLeads index: 3.1% of all Conversion Optimization detections, the 7th most-used of 261 Conversion Optimization technologies.
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Citation
TechLeads. "Optimizely Customers and Market Share." Data as of October 15, 2026. https://techleads.fyi/technology/optimizely/market-shareHTML link
<a href="https://techleads.fyi/technology/optimizely/market-share">Optimizely market share (TechLeads data)</a>Websites using each technology in the TechLeads index, and its share of all Conversion Optimization detections.
| # | Technology | Websites | Share |
|---|---|---|---|
| 1 | Preact | 776,893 | 27.8% |
| 2 | Klaviyo | 386,769 | 13.9% |
| 3 | Hotjar | 383,994 | 13.8% |
| 4 | LinkedIn Insights | 354,648 | 12.7% |
| 5 | Yandex Metrika | 149,778 | 5.4% |
| 6 | comScore | 114,371 | 4.1% |
| 7 | Optimizely | 87,369 |
In HTTP Archive's monthly crawl of public websites, Optimizely was detected on 118,227 pages in September 2026, down 15.1% from a year earlier (peak: 225,005). Among the 1,000 most-visited sites, it appeared on 12. HTTP Archive is a separate dataset from the TechLeads index, so its numbers are not added to ours.
Same month, other A/B Testing technologies in HTTP Archive: Complianz 897,049, OneSignal 182,075, Google Optimize 86,890, Zoho PageSense 38,017, Adobe Target 34,792.
Based on country-code domains (such as .de or .co.uk); websites on .com and other generic domains are not assigned a country.
See all 87,369 websites using Optimizely or download the full list as a CSV for $29.
TechLeads scans public websites and detects Optimizely from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is Optimizely's website count divided by the website counts of all Conversion Optimization technologies we track; a site using two Conversion Optimization tools counts for both. Counts were last refreshed on October 15, 2026 and update daily.
| 3.1% |
| 8 | Matomo | 84,597 | 3.0% |
| 9 | Pendo | 32,680 | 1.2% |
| 10 | Mailmunch | 25,889 | 0.93% |
| 11 | Zoho PageSense | 22,981 | 0.82% |
| 12 | Adpearance | 21,056 | 0.75% |
| 13 | Secomapp | 16,688 | 0.60% |
| 14 | Get Lasso | 16,124 | 0.58% |
| 15 | Bold Commerce | 14,595 | 0.52% |
| 16 | PageFly | 14,568 | 0.52% |
| 17 | Ptengine China | 14,348 | 0.51% |
| 18 | Etracker | 14,141 | 0.51% |
| 19 | Poptin | 13,906 | 0.50% |
| 20 | Rebuy | 13,894 | 0.50% |
| 21 | Bing Conversion Tracking | 13,829 | 0.50% |
Rows link to each competitor's market share page where one exists. The table lists the 21 most-used technologies; ranks are by website count.