A side-by-side comparison of two a/b testing & experimentation tools, based on the 21,296 A/B Testing sites tracked by Site Stats Database.
Last updated
| Metric | Convert | Optimizely |
|---|---|---|
| Websites | 1,160 | 1,701 |
| Market share | 5.4% | 8.0% |
| Share of top 10K sites | 0.36% | 1.6% |
| Share of top 100K sites |
|---|
| 0.36% |
| 0.55% |
| Rank | #6 | #5 |
|---|
| Median DR | 52 | 54 |
|---|
| Average DR | 50 | 48 |
|---|
| Median keywords | 2,480 | 1,631 |
|---|
| Median referring domains | 1,114 | 1,150 |
|---|
| Median domain age | 18 yrs | 21 yrs |
|---|
| Average domain age | 18 yrs | 20 yrs |
|---|
| Average monthly traffic | 147,977 | 1,268,707 |
|---|
| Combined monthly traffic | 171,652,847 | 2,158,071,304 |
|---|
Monthly snapshots of each segment, 2026-06 to 2026-07. Website counts move when our catalog grows; the share of tracked sites is normalized, so it only moves when real prevalence changes.
Websites
Share of tracked sites
Combined monthly traffic
1,160 websites · rank #6
Top industries
Top markets
1,701 websites · rank #5
Top industries
Top markets
Optimizely is used by more websites in our catalog: 1,160 use Convert and 1,701 use Optimizely.
Optimizely sites have the higher median Ahrefs Domain Rating (Convert: 52, Optimizely: 54).
Between 2026-06 and 2026-07, Convert went from 0.18% to 0.13% of all tracked sites, while Optimizely went from 0.21% to 0.19%. Optimizely is gaining ground faster in our index.
7 websites in our catalog use both Convert and Optimizely.
Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.
Citation
Site Stats Database. "Convert vs Optimizely." Site Stats Database, July 1, 2026. https://sitestatsdb.com/technologies/ab-testing/compare/convert-vs-optimizely
Site Stats Database tracks 1,160 websites using Convert and 1,701 using Optimizely, each enriched with full monthly traffic history, authority, keywords, referring domains, and the complete detected tech stack. We detect every A/B testing tool by crawling each site's HTML, response headers, and DNS; traffic and SEO metrics come from DataForSEO and Ahrefs. Everything refreshes at least monthly.
See plans & pricing| English |
| 82 |
| 198,939 |
| 23,202 |
| 30 yrs |
| 6,165,836 |
| Convert |
| nature.org | English | 88 | 159,235 | 63,379 | 30 yrs | 3,925,652 | Convert |
| art.com | English | 76 | 183,919 | 25,709 | 27 yrs | 3,573,144 | Convert |
| studiosuits.com | English | 65 | 61,556 | 2,436 | 17 yrs | 3,417,730 | Convert |
| brecks.com | English | 54 | 68,790 | 3,586 | 30 yrs | 3,417,345 | Convert |
| rotorooter.com | English | 74 | 73,501 | 7,625 | 28 yrs | 3,293,319 | Convert |
| roll20.net | English | 77 | 116,213 | 54,391 | 14 yrs | 3,241,834 | Convert |
| haircuttery.com | English | 58 | 40,896 | 3,324 | 28 yrs | 3,133,044 | Convert |
| outsideonline.com | English | 90 | 385,391 | 102,954 | 27 yrs | 3,091,489 | Convert |
| English |
| 93 |
| 3,887,532 |
| 716,813 |
| 36 yrs |
| 145,867,646 |
| Optimizely |
| cnn.com | English | 93 | 3,578,724 | 1,035,782 | 32 yrs | 110,708,925 | Optimizely |
| starbucks.com | English | 89 | 319,049 | 100,499 | 32 yrs | 39,976,207 | Optimizely |
| cinemark.com | English | 76 | 271,185 | 12,909 | 30 yrs | 33,417,105 | Optimizely |
| heart.org | English | 91 | 559,706 | 159,503 | 31 yrs | 29,746,075 | Optimizely |
| michaels.com | English | 83 | 1,192,309 | 71,560 | 31 yrs | 27,717,581 | Optimizely |
| oanda.com | English | 84 | 98,144 | 28,934 | 29 yrs | 23,705,563 | Optimizely |
| petsmart.com | English | 80 | 528,037 | 20,803 | 30 yrs | 22,276,272 | Optimizely |
| peacocktv.com | English | 82 | 358,336 | 34,509 | 13 yrs | 20,788,718 | Optimizely |