Websites Powered by Complianz
573,289 websites tracked using Complianz (A/B Testing) · complianz.io
Complianz is a tool for running A/B and multivariate experiments to compare page variants. Its official site is complianz.io. PoweredBy tracks the websites that use Complianz 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
100K
200K
300K
Oct 2021
Jan 2023
Mar 2024
Jun 2025
Aug 2026
Domains observed using Complianz in each month's HTTP Archive crawl,
Oct 2021 to Aug 2026 · peak 268,789 in Jun 2026. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 2.3 s
INP 75 ms
CLS 0
TTFB 1300 ms
Median site among 256,545 Complianz sites with Chrome UX data, p75 values, Aug 2026.
Top countries
Spain
40,362
Germany
38,227
France
36,059
Italy
29,561
United States
20,910
United Kingdom
17,694
Netherlands
15,238
Czechia
10,520
Sites using Complianz by audience country, Chrome UX Report.
Top sites by authority
9+
3% · 12 of 372 sites
8+
3% · 235 of 7,677 sites
7+
2% · 850 of 45,712 sites
6+
2% · 1,759 of 110,136 sites
5+
1% · 3,683 of 246,751 sites
The share of the web's most authoritative domains, by Open Page Rank tier, seen running Complianz in recent crawls. Only 372 domains worldwide score 9 or higher.
Websites using Complianz
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 1 | europa.eu | 9.57/10 | 42,200 | 31,835 | Aug 2022 |
| 2 | forbes.com | 9.28/10 | 11,895,600 | 3,957,523 | Sep 2022 |
| 3 | who.int | 9.26/10 | 3,114,700 | 778,407 | Mar 2024 |
| 4 | ca.gov | 9.23/10 | 1,457,100 | 28,722 | Apr 2024 |
| 5 | berkeley.edu | 9.10/10 | 166,900 | 5,412 | Mar 2026 |
| 6 | state.gov | 9.07/10 | 3,314,200 | 200,218 | Apr 2025 |
| 7 | nginx.org | 9.05/10 | 17,500 | 22,208 | Jan 2025 |
| 8 | acm.org | 9.05/10 | 24,100 | 17,765 | Nov 2025 |
| 9 | vercel.app | 9.05/10 | - | - | Aug 2026 |
| 10 | wpengine.com | 9.04/10 | 66,500 | 17,967 | Nov 2021 |
| 11 | uk.com | 9.00/10 | 2 | 12 | Nov 2021 |
| 12 | upenn.edu | 9.00/10 | 179,200 | 5,457 | Apr 2026 |
| 13 | complianz.io | 8.98/10 | 510 | 864 | Nov 2021 |
| 14 | ethz.ch | 8.95/10 | 12,900 | 11,869 | Sep 2023 |
| 15 | bayern.de | 8.92/10 | 12,500 | 512 | Nov 2021 |
| 16 | opensource.org | 8.89/10 | 22,200 | 6,030 | Nov 2023 |
| 17 | azurewebsites.net | 8.87/10 | - | - | Dec 2022 |
| 18 | cam.ac.uk | 8.87/10 | 208,200 | 35,354 | Dec 2021 |
| 19 | us.com | 8.86/10 | 32 | 9 | Oct 2021 |
| 20 | ufl.edu | 8.84/10 | 241,600 | 3,624 | Aug 2025 |
| 21 | cnrs.fr | 8.82/10 | 4,300 | 2,992 | Nov 2021 |
| 22 | in.gov | 8.80/10 | 3,076,000 | 1,001,546 | Oct 2025 |
| 23 | ipsos.com | 8.79/10 | 23,800 | 18,825 | Feb 2025 |
| 24 | fraunhofer.de | 8.79/10 | 2,900 | 3,059 | Aug 2023 |
| 25 | msu.edu | 8.78/10 | 149,500 | 2,641 | May 2026 |
| 26 | eu.com | 8.77/10 | - | - | Nov 2021 |
| 27 | gouv.qc.ca | 8.77/10 | - | - | Nov 2022 |
| 28 | usembassy.gov | 8.77/10 | 109,000 | 24,898 | Mar 2025 |
| 29 | mo.gov | 8.75/10 | 136,100 | 9,975 | Nov 2022 |
| 30 | uwaterloo.ca | 8.71/10 | 224,700 | 71,840 | Feb 2025 |
| 31 | pitt.edu | 8.69/10 | 62,900 | 8,815 | Aug 2023 |
| 32 | childmind.org | 8.68/10 | 163,900 | 61,541 | Jan 2026 |
| 33 | tufts.edu | 8.68/10 | 98,500 | 9,726 | Aug 2025 |
| 34 | xsrv.jp | 8.68/10 | - | - | Nov 2023 |
| 35 | pantheonsite.io | 8.67/10 | 7 | 5 | Dec 2022 |
| 36 | ed.ac.uk | 8.67/10 | 29,600 | 5,927 | Jan 2024 |
| 37 | esa.int | 8.67/10 | 412,100 | 94,679 | Nov 2021 |
| 38 | delaware.gov | 8.67/10 | 128,800 | 12,757 | Jul 2026 |
| 39 | hawaii.gov | 8.67/10 | 34 | 270 | Aug 2023 |
| 40 | nba.com | 8.66/10 | 23,476,900 | 1,089,703 | Nov 2024 |
| 41 | altervista.org | 8.66/10 | - | - | Nov 2021 |
| 42 | greenpeace.org | 8.66/10 | 69,500 | 29,682 | Apr 2023 |
| 43 | ru.com | 8.65/10 | - | - | Mar 2026 |
| 44 | uga.edu | 8.65/10 | 234,400 | 2,908 | May 2024 |
| 45 | insee.fr | 8.65/10 | 25,500 | 15,430 | Jun 2024 |
| 46 | cuny.edu | 8.65/10 | 294,000 | 61,388 | May 2025 |
| 47 | usp.br | 8.65/10 | 1 | 19 | May 2023 |
| 48 | gencat.cat | 8.63/10 | 86 | 174 | Dec 2025 |
| 49 | tudelft.nl | 8.63/10 | 23,300 | 7,683 | Jul 2022 |
| 50 | ub.edu | 8.62/10 | 11,300 | 24,177 | Jul 2026 |
| 51 | com.de | 8.62/10 | 5 | 14 | Jun 2022 |
| 52 | hawaii.edu | 8.62/10 | 117,100 | 43,233 | Sep 2025 |
| 53 | unibe.ch | 8.60/10 | 4,700 | 1,336 | May 2026 |
| 54 | krakow.pl | 8.59/10 | 690 | 649 | Oct 2021 |
| 55 | sverigesradio.se | 8.59/10 | 7,100 | 9,581 | Apr 2026 |
| 56 | csic.es | 8.59/10 | 1,200 | 2,107 | Oct 2023 |
| 57 | univie.ac.at | 8.58/10 | 10,000 | 1,103 | Sep 2023 |
| 58 | alberta.ca | 8.58/10 | 115,900 | 65,281 | Dec 2024 |
| 59 | cnr.it | 8.57/10 | 810 | 1,174 | Oct 2021 |
| 60 | doaj.org | 8.56/10 | 36,200 | 25,008 | Apr 2024 |
| 61 | utwente.nl | 8.56/10 | 11,800 | 6,416 | Aug 2022 |
| 62 | cuni.cz | 8.56/10 | 4,400 | 1,637 | Apr 2022 |
| 63 | nhl.com | 8.55/10 | 9,107,800 | 775,789 | Feb 2026 |
| 64 | belgium.be | 8.55/10 | 20,400 | 1,736 | Jun 2025 |
| 65 | nato.int | 8.55/10 | 340,700 | 121,553 | Apr 2023 |
| 66 | rwth-aachen.de | 8.55/10 | 640 | 1,476 | Oct 2022 |
| 67 | missouri.edu | 8.55/10 | 111,700 | 10,535 | Feb 2025 |
| 68 | uvic.ca | 8.54/10 | 44,200 | 19,833 | Apr 2025 |
| 69 | ubisoft.com | 8.53/10 | 983,500 | 199,233 | Nov 2021 |
| 70 | za.com | 8.53/10 | - | - | Aug 2022 |
| 71 | spb.ru | 8.53/10 | - | - | Nov 2022 |
| 72 | uni-stuttgart.de | 8.53/10 | 1,600 | 2,181 | Aug 2025 |
| 73 | uni-hamburg.de | 8.53/10 | 5,500 | 3,110 | Mar 2022 |
| 74 | fsu.edu | 8.53/10 | 247,200 | 10,316 | Mar 2025 |
| 75 | upm.es | 8.52/10 | 2,100 | 1,692 | Jan 2023 |
| 76 | wpml.org | 8.51/10 | 2,100 | 2,370 | Aug 2024 |
| 77 | gov.ro | 8.51/10 | 640 | 166 | Nov 2021 |
| 78 | unizar.es | 8.51/10 | 280 | 138 | Feb 2022 |
| 79 | artificialintelligenceact.eu | 8.51/10 | 19,800 | 12,529 | Aug 2025 |
| 80 | umontreal.ca | 8.50/10 | 3,700 | 761 | Jan 2026 |
| 81 | hostingersite.com | 8.49/10 | - | - | May 2025 |
| 82 | uni-goettingen.de | 8.49/10 | 6,400 | 3,874 | Nov 2021 |
| 83 | tu-dresden.de | 8.49/10 | 2,300 | 3,199 | Aug 2022 |
| 84 | uni-koeln.de | 8.49/10 | 1,200 | 427 | Nov 2021 |
| 85 | panasonic.com | 8.48/10 | 42,700 | 27,959 | Mar 2026 |
| 86 | gov.wales | 8.48/10 | 37,700 | 16,015 | Aug 2022 |
| 87 | tno.nl | 8.48/10 | 4,400 | 2,178 | Jul 2023 |
| 88 | unirioja.es | 8.48/10 | 620 | 1,912 | Jul 2026 |
| 89 | gva.es | 8.47/10 | 490 | 1,924 | Oct 2023 |
| 90 | poznan.pl | 8.47/10 | 320 | 564 | Oct 2021 |
| 91 | de.com | 8.46/10 | - | 2 | Dec 2021 |
| 92 | core.ac.uk | 8.46/10 | 26,700 | 88,757 | Feb 2025 |
| 93 | queensu.ca | 8.46/10 | 44,000 | 26,583 | Jul 2024 |
| 94 | gov.hu | 8.44/10 | - | - | Apr 2026 |
| 95 | laposte.fr | 8.44/10 | 16,300 | 4,767 | May 2022 |
| 96 | ulaval.ca | 8.44/10 | 2,800 | 1,607 | Jun 2023 |
| 97 | us.es | 8.43/10 | 1,400 | 3,306 | Nov 2021 |
| 98 | mcmaster.ca | 8.43/10 | 4,600 | 1,351 | Jul 2026 |
| 99 | openid.net | 8.42/10 | 10,500 | 7,766 | Jul 2023 |
| 100 | hypotheses.org | 8.42/10 | 2 | 4 | Oct 2021 |
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) →
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