Websites Powered by Optimizely
66,497 websites tracked using Optimizely (A/B Testing) · www.optimizely.com
Optimizely is a tool for running A/B and multivariate experiments to compare page variants. Its official site is optimizely.com. PoweredBy tracks the websites that use Optimizely across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the a/b testing ecosystem.
Usage trend
10K
20K
30K
Apr 2018
May 2020
Jul 2022
Aug 2024
Sep 2026
Domains observed using Optimizely in each month's HTTP Archive crawl,
Apr 2018 to Sep 2026 · peak 29,730 in Sep 2024. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 1.9 s
INP 100 ms
CLS 0.05
TTFB 800 ms
Median site among 32,009 Optimizely sites with Chrome UX data, p75 values, Sep 2026.
Top countries
United States
25,713
Canada
6,439
India
5,059
United Kingdom
4,863
Australia
4,155
Germany
3,558
France
3,449
Spain
3,393
Sites using Optimizely by audience country, Chrome UX Report.
Usage by industry
| Industry | Share | Websites |
|---|---|---|
| Automotive | 9.91% | 6,883 |
| Healthcare | 0.85% | 907 |
| Finance and insurance | 0.72% | 119 |
| Restaurants and food | 0.54% | 741 |
| Education | 0.41% | 203 |
| Professional services | 0.25% | 104 |
| Games | 0.23% | 11 |
| Non-profit and religious | 0.22% | 17 |
| Home and construction | 0.15% | 70 |
| Legal | 0.15% | 34 |
| News and media | 0.12% | 51 |
| Retail | 0.12% | 365 |
Share of each industry's websites with a detected stack that use Optimizely; industries come from what sites declare in their own structured data.
Top sites by authority
9+
8% · 31 of 372 sites
8+
5% · 409 of 7,677 sites
7+
3% · 1,164 of 45,712 sites
6+
2% · 1,833 of 110,136 sites
5+
1% · 2,639 of 246,751 sites
The share of the web's most authoritative domains, by Open Page Rank tier, seen running Optimizely in recent crawls. Only 372 domains worldwide score 9 or higher.
Websites using Optimizely
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 1 | adobe.com | 9.48/10 | 8,261,900 | 815,230 | Jul 2023 |
| 2 | cloudfront.net | 9.47/10 | - | - | Mar 2022 |
| 3 | github.io | 9.43/10 | 1,800 | 1 | Aug 2018 |
| 4 | zoom.us | 9.29/10 | 681,100 | 57,492 | May 2017 |
| 5 | harvard.edu | 9.24/10 | 472,700 | 11,444 | Aug 2018 |
| 6 | mailchimp.com | 9.19/10 | 424,300 | 91,330 | Feb 2018 |
| 7 | cnn.com | 9.16/10 | 15,758,100 | 2,569,749 | Jan 2016 |
| 8 | npr.org | 9.16/10 | 10,414,500 | 1,914,771 | Sep 2018 |
| 9 | bbc.com | 9.15/10 | 21,781,400 | 3,075,286 | Jan 2016 |
| 10 | wiley.com | 9.14/10 | 76,400 | 29,151 | Jun 2018 |
| 11 | hbr.org | 9.14/10 | 597,200 | 196,139 | Jun 2018 |
| 12 | klaviyo.com | 9.13/10 | 68,700 | 14,050 | Feb 2025 |
| 13 | ibm.com | 9.13/10 | 11,139,500 | 518,522 | Jul 2017 |
| 14 | wsj.com | 9.13/10 | 3,080,500 | 919,012 | Jul 2017 |
| 15 | myshopify.com | 9.12/10 | - | - | May 2017 |
| 16 | squarespace.com | 9.11/10 | 233,400 | 29,406 | Aug 2018 |
| 17 | prnewswire.com | 9.11/10 | 1,805,000 | 1,041,607 | Jan 2019 |
| 18 | zendesk.com | 9.10/10 | 416,900 | 60,938 | May 2017 |
| 19 | salesforce.com | 9.10/10 | 1,368,700 | 131,215 | Jul 2018 |
| 20 | berkeley.edu | 9.10/10 | 166,700 | 4,721 | Aug 2018 |
| 21 | cornell.edu | 9.10/10 | 140,600 | 19,190 | Oct 2023 |
| 22 | imgur.com | 9.07/10 | 834,200 | 577,884 | Jun 2025 |
| 23 | typeform.com | 9.07/10 | 54,200 | 11,336 | Feb 2016 |
| 24 | wpengine.com | 9.04/10 | 66,200 | 15,765 | May 2017 |
| 25 | mayoclinic.org | 9.04/10 | 60,718,700 | 3,415,662 | Jun 2018 |
| 26 | slack.com | 9.02/10 | 544,200 | 88,852 | Aug 2018 |
| 27 | atlassian.com | 9.01/10 | 1,049,000 | 152,410 | May 2017 |
| 28 | netlify.app | 9.01/10 | 2 | 2 | Jul 2022 |
| 29 | unicef.org | 9.01/10 | 286,700 | 135,578 | Aug 2018 |
| 30 | gitlab.com | 9.00/10 | 87,500 | 29,195 | Jul 2017 |
| 31 | uk.com | 9.00/10 | 2 | 12 | Jan 2016 |
| 32 | square.site | 8.99/10 | 91,400 | 35,156 | May 2019 |
| 33 | fortune.com | 8.99/10 | 1,515,200 | 527,201 | Jun 2017 |
| 34 | constantcontact.com | 8.98/10 | 48,500 | 20,710 | May 2017 |
| 35 | clevelandclinic.org | 8.97/10 | 2,400 | 597 | Jun 2024 |
| 36 | gofundme.com | 8.96/10 | 596,700 | 165,546 | Jul 2019 |
| 37 | theconversation.com | 8.96/10 | 1,494,300 | 816,726 | Jul 2026 |
| 38 | change.org | 8.96/10 | 209,800 | 138,005 | Oct 2018 |
| 39 | webflow.io | 8.95/10 | 79 | 1 | Nov 2022 |
| 40 | nsw.gov.au | 8.95/10 | 75,300 | 73,181 | Jul 2023 |
| 41 | mynavi.jp | 8.95/10 | 81 | 14 | Aug 2018 |
| 42 | economist.com | 8.94/10 | 417,900 | 145,490 | Jun 2018 |
| 43 | techtarget.com | 8.91/10 | 2,092,900 | 338,991 | Jan 2018 |
| 44 | gallup.com | 8.91/10 | 125,900 | 27,953 | Aug 2018 |
| 45 | nypost.com | 8.91/10 | 5,009,700 | 1,907,312 | Aug 2017 |
| 46 | nyu.edu | 8.90/10 | 674,000 | 142,032 | Aug 2018 |
| 47 | hbs.edu | 8.89/10 | 262,700 | 50,518 | Aug 2018 |
| 48 | zapier.com | 8.88/10 | 1,212,000 | 201,550 | Jul 2026 |
| 49 | azurewebsites.net | 8.87/10 | - | - | Jan 2019 |
| 50 | barnesandnoble.com | 8.87/10 | 5,321,100 | 1,057,739 | Sep 2018 |
| 51 | optimizely.com | 8.86/10 | 149,400 | 9,101 | May 2017 |
| 52 | site.com | 8.86/10 | - | 1 | Aug 2021 |
| 53 | nami.org | 8.86/10 | 621,700 | 102,202 | May 2024 |
| 54 | northwestern.edu | 8.86/10 | 193,400 | 45,922 | Aug 2018 |
| 55 | smh.com.au | 8.86/10 | 190,800 | 204,181 | Aug 2018 |
| 56 | cvent.com | 8.85/10 | 700,000 | 230,289 | Jul 2017 |
| 57 | heart.org | 8.85/10 | 3,118,800 | 377,461 | Aug 2018 |
| 58 | news.com.au | 8.85/10 | 494,400 | 340,842 | Sep 2023 |
| 59 | intuit.com | 8.84/10 | 806,400 | 28,834 | Jun 2018 |
| 60 | marketwatch.com | 8.84/10 | 7,101,000 | 546,328 | Jun 2018 |
| 61 | politico.com | 8.84/10 | 1,637,900 | 483,715 | Aug 2016 |
| 62 | foxnews.com | 8.84/10 | 3,829,400 | 1,132,332 | Jun 2018 |
| 63 | ufl.edu | 8.84/10 | 241,500 | 3,277 | Oct 2024 |
| 64 | ucsd.edu | 8.84/10 | 48,100 | 2,261 | Jul 2023 |
| 65 | hootsuite.com | 8.83/10 | 90,200 | 24,229 | Jun 2017 |
| 66 | ucdavis.edu | 8.83/10 | 381,100 | 81,485 | Jul 2019 |
| 67 | unc.edu | 8.83/10 | 341,300 | 24,562 | Aug 2018 |
| 68 | bigcommerce.com | 8.82/10 | 88,600 | 17,983 | May 2017 |
| 69 | tableau.com | 8.82/10 | 261,800 | 56,830 | Aug 2016 |
| 70 | asu.edu | 8.82/10 | 144,500 | 3,666 | Jul 2021 |
| 71 | it.com | 8.81/10 | - | - | Jun 2026 |
| 72 | wikihow.com | 8.81/10 | 8,169,600 | 3,244,805 | May 2017 |
| 73 | squareup.com | 8.80/10 | 1,016,500 | 123,017 | Dec 2017 |
| 74 | bitly.com | 8.79/10 | 133,500 | 16,485 | Nov 2019 |
| 75 | hp.com | 8.78/10 | 2,701,800 | 494,419 | Jun 2018 |
| 76 | georgetown.edu | 8.78/10 | 136,900 | 25,266 | Aug 2018 |
| 77 | msu.edu | 8.78/10 | 149,500 | 2,186 | Sep 2018 |
| 78 | sproutsocial.com | 8.77/10 | 353,400 | 70,594 | Sep 2020 |
| 79 | wpenginepowered.com | 8.77/10 | - | - | Jan 2025 |
| 80 | eu.com | 8.77/10 | - | - | Aug 2016 |
| 81 | kpmg.com | 8.77/10 | 125,800 | 81,369 | Nov 2025 |
| 82 | asana.com | 8.77/10 | 536,400 | 80,322 | Aug 2017 |
| 83 | unhcr.org | 8.77/10 | 178,800 | 55,400 | Mar 2025 |
| 84 | elastic.co | 8.76/10 | 97,600 | 39,956 | Jun 2020 |
| 85 | web.app | 8.76/10 | - | - | Apr 2022 |
| 86 | thesun.co.uk | 8.76/10 | 549,800 | 570,089 | Sep 2020 |
| 87 | rutgers.edu | 8.75/10 | 146,600 | 28,567 | Jun 2025 |
| 88 | jetbrains.com | 8.74/10 | 219,300 | 101,335 | Jan 2024 |
| 89 | herokuapp.com | 8.74/10 | - | - | Jan 2019 |
| 90 | today.com | 8.74/10 | 5,184,700 | 1,625,275 | Jan 2016 |
| 91 | sky.com | 8.73/10 | 363,900 | 95,333 | Jun 2018 |
| 92 | mirror.co.uk | 8.73/10 | 612,700 | 589,543 | Jan 2016 |
| 93 | ctvnews.ca | 8.72/10 | 248,200 | 295,610 | May 2023 |
| 94 | freshdesk.com | 8.71/10 | 3 | 2 | Aug 2018 |
| 95 | justgiving.com | 8.71/10 | 3,100 | 5,043 | Aug 2017 |
| 96 | moma.org | 8.71/10 | 1,435,700 | 117,195 | Jun 2018 |
| 97 | ikea.com | 8.71/10 | 10,029,900 | 1,215,786 | Nov 2018 |
| 98 | arizona.edu | 8.71/10 | 127,500 | 23,873 | Mar 2024 |
| 99 | rackcdn.com | 8.70/10 | - | - | Oct 2025 |
| 100 | sfgate.com | 8.70/10 | 1,315,100 | 532,900 | Aug 2018 |
Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.
Download top 10,000 as CSV (zip) →
Columns: domain, Open Page Rank, first seen, last seen, industry (from the site's own structured data, blank when none).
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