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85,106 live sites using Optimizely right now

A/B Testing · by Optimizely · since 2010 · Proprietary

85K sites Dataset updated · 2026-08-18
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About Optimizely

webatla tracks 85,106 live websites using Optimizely, 0.0% of every site we index. Download the full list of websites that use Optimizely as a daily JSONL export. Every record includes the domain plus DNS, WHOIS, IP address, hosting country and global rank.

Optimizely is a leading digital experience optimization platform offering A/B testing, multivariate testing, feature flagging, and personalization capabilities for websites and mobile applications. Founded in 2010 and headquartered in San Francisco, Optimizely enables product and marketing teams to experiment at scale and make data-driven decisions to improve conversion rates and user engagement.

The platform provides a visual editor for no-code experiment creation as well as a full-featured SDK for developer-driven testing. Optimizely's feature management capabilities allow engineering teams to safely roll out new features with gradual rollouts and kill switches. In 2021, Optimizely merged with Episerver to form a broader digital experience platform covering content management, commerce, and experimentation. It is used by enterprises across retail, media, technology, and financial services industries.

At a glance

VendorOptimizely
LanguageJavaScript
LicenseProprietary
First release2010-01-01
All figures as of Aug 18, 2026
85,106 Sites detected
0.0% Of all websites

Database preview of Optimizely sites

Optimizely detection is a value inside the Technologies column. Two datasets carry it, switch between them to compare what's included.

webatla-technologies-optimizely-2026-08-18.jsonl.zst · 85,106 rows · 14 columns Daily fresh export
DomainTLD suffixTLDDomain typeHTTP statusIP addressCountry by IPSocial networksTechnologies last data checkedTechnologiesPR valueHarmonic valueDomain creation dateDomain expiration date
clevelandclinic.orgorgorgICANNHTTP 200104.18.32.216US{"youtube":["https://youtube.com/user/clevelandclinic"],"facebook":["https://facebook.com/ClevelandClinic"],"linkedin":["https://linkedin.com/company/cleveland-clinic"],"snapchat":["https://snapchat.com/add/clevelandclinic"],"instagram":["https://instagram.com/clevelandclinic"],"pinterest":["https://pinterest.com/clevelandclinic"],"x-twitter":["https://twitter.com/clevelandclinic"]}2026-07-27HSTS, HTTP/3, jQuery 3.0.0, Favicon, hreflang, Dynatrace, Cloudflare, Google Ads, Open Graph, Optimizely0.000024992318,919,3761998-01-082027-01-07
kotlinlang.orgorgorgICANNHTTP 20013.35.58.20US{"github":["https://github.com/JetBrains/kotlin/releases/tag/v2.4.10","https://github.com/JetBrains/kotlin","https://github.com/JetBrains/kotlin-web-site/blob/master/LICENSE"],"medium":["https://medium.com/mcdonalds-technical-blog/mobile-multiplatform-development-at-mcdonalds-3b72c8d44ebc","https://medium.com/adobetech/streamlining-server-side-app-development-with-kotlin-be8cf9d8b61a"],"reddit":["https://reddit.com/r/Kotlin"],"bluesky":["https://bsky.app/profile/kotlinlang.org"],"youtube":["https://youtube.com/channel/UCP7uiEZIqci43m22KDl0sNw"],"x-twitter":["https://x.com/kotlin"]}2026-08-08HTTP/2, Hotjar, Favicon, Amazon S3, Google Ads, Open Graph, Optimizely, Facebook Pixel, Google Font API, Google Analytics0.000013466717,871,9122013-09-302026-09-30
klaviyo.comcomcomICANNHTTP 20013.32.99.16US{"facebook":["https://facebook.com/Klaviyo"],"linkedin":["https://linkedin.com/company/klaviyo"],"instagram":["https://instagram.com/klaviyo"],"x-twitter":["https://twitter.com/klaviyo"]}2026-08-07PWA, HSTS, Astro, Canva, Slack, HTTP/2, Heroku, Notion, OpenAI, Sanity0.00013069918,197,2562012-03-292032-03-29
mailchimp.comcomcomICANNHTTP 20023.58.104.103DE{"youtube":["https://youtube.com/user/Mailchimp"],"facebook":["https://facebook.com/mailchimp"],"linkedin":["https://linkedin.com/company/mailchimp"],"instagram":["https://instagram.com/mailchimp"],"pinterest":["https://pinterest.com/mailchimp"],"x-twitter":["https://x.com/Mailchimp"]}2026-08-09HSTS, Envoy, Akamai, HTTP/2, Favicon, DigiCert, DocuSign, OneTrust, hreflang, Atlassian0.00011773419,450,7582001-06-292029-06-29
typeform.comcomcomICANNHTTP 2003.167.227.21US{"youtube":["https://youtube.com/channel/UC2nRv6J0FsJVePJTLhUDKgg"],"facebook":["https://facebook.com/typeform"],"linkedin":["https://linkedin.com/company/typeform-com"],"instagram":["https://instagram.com/typeform"],"x-twitter":["https://twitter.com/typeform"]}2026-07-08Miro, Canva, Figma, HTTP/3, Notion, OpenAI, Stripe, Wistia, jQuery 3.5.1, Favicon0.000071957118,654,2742002-06-202034-06-20
DomainTLD suffixTLDDomain typeHTTP statusIP addressCountry by IPSocial networksTechnologies last data checkedTechnologiesDNS last data checkedDNS StatusDNS recordsPR valueHarmonic valueRDAP/WHOIS last data checkedRDAP/WHOIS methodDomain creation dateDomain expiration dateDomain last changedRegistrarRDAP/WHOIS RecordResponse Status RDAP/WHOIS
clevelandclinic.orgorgorgICANNHTTP 200104.18.32.216US{"youtube":["https://youtube.com/user/clevelandclinic"],"facebook":["https://facebook.com/ClevelandClinic"],"linkedin":["https://linkedin.com/company/cleveland-clinic"],"snapchat":["https://snapchat.com/add/clevelandclinic"],"instagram":["https://instagram.com/clevelandclinic"],"pinterest":["https://pinterest.com/clevelandclinic"],"x-twitter":["https://twitter.com/clevelandclinic"]}2026-07-27HSTS, HTTP/3, jQuery 3.0.0, Favicon, hreflang, Dynatrace, Cloudflare, Google Ads, Open Graph, Optimizely2026-08-06TRUE{"A":["104.18.32.216","172.64.155.40"],"DS":[{"digest":"82933ecd1f6c8042e21dfa2bc9cce84fa180f5fc44ee068e9ba85d36884fb913","key_tag":2371,"algorithm":13,"digest_type":2}],"MX":[{"host":"us-smtp-inbound-1.mimecast.com","priority":10},{"host":"us-smtp-inbound-2.mimecast.com","priority":10}],"NS":["bob.ns.cloudflare.com","etta.ns.cloudflare.com"],"SOA":{"mname":"bob.ns.cloudflare.com","retry":2400,"rname":"dns.cloudflare.com","expire":604800,"serial":2411258259,"minimum":1800,"refresh":10000},"TXT":["7f576db0-d122-4e47-8a99-2393581c66e5","Cyber Security. google-site-verification=JbmfgQrxaJNkFtbuyBrETJRlUeAE8CB-XOn9L7N9Zig","MS=ms25572796","d365mktkey=28sa7bafpe2de8vpiioj7eyhf","d365mktkey=3gwph51api0dfr21luukz4df7","d365mktkey=69fhnrl1ynapps6shvxrngv3m","d365mktkey=6vnv94i0t2irkvtbnd7t9qlg5","d365mktkey=bdnrgug1lm2owwuuv3wofe3j","facebook-domain-verification=3lrbkbzm0s2x1t20o5zbm9e8tlaqd5","google-site-verification=01A3wN51E8DU33ZpZlgHePSdKCPTXnwsLMFMkPzRg_I","google-site-verification=JbmfgQrxaJNkFtbuyBrETJRlUeAE8CB-XOn9L7N9Zig","google-site-verification=YAkTaotFYE_Y8NGl0OVXrzJtVwgIy83UPdnPvLDSupI","google-site-verification=jiByQXocollPQ2zxJrg_u2ViUjRcBsaxy8bc0-M8EWQ","v=spf1 include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:spf.constantcontact.com ip4:192.35.79.108 ip4:192.35.79.200 ip4:192.35.79.198 ip4:192.28.148.57 ~all","vZDYsw8mvEaAKUOOQV0AiSUAKcumtLY8gnaetoVvFfDatRSItRpXDv8Tpnr7Zk9WAKdfMNfvvcMRUWA6wY894A=="],"AAAA":["2606:4700:4407::6812:20d8","2a06:98c1:3103::ac40:9b28"],"HTTPS":[{"params":["alpn=h3,h2","ipv4hint=104.18.32.216,172.64.155.40","ipv6hint=2606:4700:4407::6812:20d8,2a06:98c1:3103::ac40:9b28"],"target":"","priority":1}],"DNSKEY":[{"flags":256,"protocol":3,"algorithm":13,"public_key":"oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA=="},{"flags":257,"protocol":3,"algorithm":13,"public_key":"mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+KkxLbxILfDLUT0rAK9iUzy1L53eKGQ=="}]}0.000024992318,919,3762025-12-09RDAP1998-01-082027-01-072025-12-09GoDaddy Corporate Domains, LLC{"raw_response":{"links":[{"rel":"related","href":"https://rdap.brandsight.com/v1/domain/clevelandclinic.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org"},{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org"}],"events":[{"eventDate":"2024-02-07T23:04:55.172Z","eventAction":"transfer"},{"eventDate":"2027-01-07T05:00:00Z","eventAction":"expiration"},{"eventDate":"1998-01-08T05:00:00.608Z","eventAction":"registration"},{"eventDate":"2025-12-08T23:07:19.555Z","eventAction":"last changed"},{"eventDate":"2025-12-09T06:37:55.652Z","eventAction":"last update of RDAP database"}],"status":["client transfer prohibited","renew period"],"ldhName":"clevelandclinic.org","notices":[{"links":[{"rel":"terms-of-service","href":"https://thenew.org/org-people/about-pir/policies/","type":"text/html","value":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org"}],"title":"Terms of Service","description":["Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. Public Interest Registry does not guarantee its accuracy. Users accessing the Public Interest Registry RDAP service agree to use the data only for lawful purposes, and under no circumstances may this data be used to: a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the registrar's own existing customers and b) enable high volume, automated, electronic processes that send queries or data to the systems of Public Interest Registry or any ICANN-accredited registrar, except as reasonably necessary to register domain names or modify existing registrations. When using the Public Interest Registry RDAP service, please consider the following: the RDAP service is not a replacement for standard EPP commands to the SRS service. RDAP is not considered authoritative for registered domain objects. The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data can be requested by submitting a request to WHOISrequest@pir.org. Public Interest Registry Inc. reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy."]},{"links":[{"rel":"glossary","href":"https://icann.org/epp","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org"}],"title":"Status Codes","description":["For more information on domain status codes, please visit https://icann.org/epp"]},{"links":[{"rel":"help","href":"https://icann.org/wicf","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/clevelandclinic.org"}],"title":"RDDS Inaccuracy Complaint Form","description":["URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf"]}],"entities":[{"links":[{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/entity/3786","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/entity/3786"},{"rel":"about","href":"https://rdap.brandsight.com/v1","type":"application/rdap+json","value":"https://rdap.brandsight.com/v1"}],"roles":["registrar"],"handle":"3786","entities":[{"roles":["abuse"],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text",""],["tel",{"type":"voice"},"uri","tel:+1.518831586"],["email",{},"text","abuse@gcd.com"]]],"objectClassName":"entity"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"3786"}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","GoDaddy Corporate Domains, LLC"]]],"objectClassName":"entity"}],"redacted":[{"name":{"type":"Registry Domain ID"},"method":"removal","prePath":"$.handle","pathLang":"jsonpath"}],"secureDNS":{"dsData":[{"digest":"82933ECD1F6C8042E21DFA2BC9CCE84FA180F5FC44EE068E9BA85D36884FB913","keyTag":2371,"algorithm":13,"digestType":2}],"maxSigLife":1,"delegationSigned":true},"nameservers":[{"handle":"b7420fd64fee49688990507711b5c939-LROR","status":["associated"],"ldhName":"bob.ns.cloudflare.com","unicodeName":"bob.ns.cloudflare.com","objectClassName":"nameserver"},{"handle":"341d707e272f4a2e929b0df9f74ac7a6-LROR","status":["associated"],"ldhName":"etta.ns.cloudflare.com","unicodeName":"etta.ns.cloudflare.com","objectClassName":"nameserver"}],"unicodeName":"clevelandclinic.org","objectClassName":"domain","rdapConformance":["rdap_level_0","icann_rdap_response_profile_1","icann_rdap_technical_implementation_guide_1","redacted"]}}Domain is active
kotlinlang.orgorgorgICANNHTTP 20013.35.58.20US{"github":["https://github.com/JetBrains/kotlin/releases/tag/v2.4.10","https://github.com/JetBrains/kotlin","https://github.com/JetBrains/kotlin-web-site/blob/master/LICENSE"],"medium":["https://medium.com/mcdonalds-technical-blog/mobile-multiplatform-development-at-mcdonalds-3b72c8d44ebc","https://medium.com/adobetech/streamlining-server-side-app-development-with-kotlin-be8cf9d8b61a"],"reddit":["https://reddit.com/r/Kotlin"],"bluesky":["https://bsky.app/profile/kotlinlang.org"],"youtube":["https://youtube.com/channel/UCP7uiEZIqci43m22KDl0sNw"],"x-twitter":["https://x.com/kotlin"]}2026-08-08HTTP/2, Hotjar, Favicon, Amazon S3, Google Ads, Open Graph, Optimizely, Facebook Pixel, Google Font API, Google Analytics2026-08-06TRUE{"A":["13.35.58.20","13.35.58.21","13.35.58.3","13.35.58.78"],"MX":[{"host":"alt1.aspmx.l.google.com","priority":5},{"host":"alt2.aspmx.l.google.com","priority":5},{"host":"alt3.aspmx.l.google.com","priority":10},{"host":"alt4.aspmx.l.google.com","priority":10},{"host":"aspmx.l.google.com","priority":1}],"NS":["ns-1287.awsdns-32.org","ns-163.awsdns-20.com","ns-1638.awsdns-12.co.uk","ns-953.awsdns-55.net"],"CAA":[{"tag":"issuewild","flags":0,"value":";"},{"tag":"issue","flags":0,"value":"amazon.com"},{"tag":"issue","flags":0,"value":"letsencrypt.org"},{"tag":"iodef","flags":0,"value":"mailto:caa-iodef@jetbrains.com"}],"SOA":{"mname":"ns-1638.awsdns-12.co.uk","retry":900,"rname":"awsdns-hostmaster.amazon.com","expire":2019072901,"serial":2019052201,"minimum":86400,"refresh":7200},"TXT":["facebook-domain-verification=fz49z7zr0ycqj7f9qvli45x3wqzfrh","google-site-verification=Kldj7OgchCyGYVHwynlh6tOmYdmPHPVno2VxUNeW0TI","v=spf1 include:_spf.google.com a:mkto-mailer.jetbrains.com -all"]}0.000013466717,871,9122026-03-11RDAP2013-09-302026-09-302026-03-11Squarespace Domains II LLC{"raw_response":{"links":[{"rel":"related","href":"https://rdap.squarespace.domains/domain/kotlinlang.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/kotlinlang.org"},{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/domain/kotlinlang.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/kotlinlang.org"}],"events":[{"eventDate":"2018-07-26T02:40:43.078Z","eventAction":"transfer"},{"eventDate":"2026-09-30T08:17:05.714Z","eventAction":"expiration"},{"eventDate":"2013-09-30T08:17:05.714Z","eventAction":"registration"},{"eventDate":"2025-09-22T14:37:46.333Z","eventAction":"last changed"},{"eventDate":"2026-03-11T18:21:22.881Z","eventAction":"last update of RDAP database"}],"status":["client delete prohibited","client transfer prohibited"],"ldhName":"kotlinlang.org","notices":[{"links":[{"rel":"terms-of-service","href":"https://thenew.org/org-people/about-pir/policies/","type":"text/html","value":"https://rdap.publicinterestregistry.org/rdap/domain/kotlinlang.org"}],"title":"Terms of Service","description":["Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. Public Interest Registry does not guarantee its accuracy. Users accessing the Public Interest Registry RDAP service agree to use the data only for lawful purposes, and under no circumstances may this data be used to: a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the registrar's own existing customers and b) enable high volume, automated, electronic processes that send queries or data to the systems of Public Interest Registry or any ICANN-accredited registrar, except as reasonably necessary to register domain names or modify existing registrations. When using the Public Interest Registry RDAP service, please consider the following: the RDAP service is not a replacement for standard EPP commands to the SRS service. RDAP is not considered authoritative for registered domain objects. The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data can be requested by submitting a request to WHOISrequest@pir.org. Public Interest Registry Inc. reserves the right to modify these terms at any time. 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Showing 5 of 85,106 rows · Technologies · Full website tech stack per site: CMS, payments, analytics, frameworks.

Optimizely sites by country

CountrySitesShare
🇺🇸 United States 74,345 96.9%
🇩🇪 Germany 480 0.6%
🇨🇦 Canada 449 0.6%
🇸🇪 Sweden 385 0.5%
🇦🇺 Australia 174 0.2%

Optimizely sites by TLD

TLDSitesShare
.com 58,006 68.2%
.net 4,318 5.1%
.online 3,148 3.7%
.org 3,087 3.6%
.shop 1,827 2.1%

The Optimizely dataset

Every site we've detected as running Optimizely, with version, hosting, country, TLD and traffic rank.

Optimizely lives inside 2 datasets

Optimizely detection is part of Technologies (€159/mo) and All data (€599/mo). Buy either to filter the full 85,106-site list, or grab a free preview first.

Your Optimizely downloads

The datasets you own, sliced to Optimizely. Every button streams the latest daily export directly.

Format: JSONL (zstd) Dataset updated: 2026-08-18

API, columns & recipes → /account/api

Which websites are using Optimizely?

webatla detects every site using Optimizely and exports them as one downloadable list, so you can see who relies on this technology and what else runs alongside it.

Open the Optimizely technology dataset to break adoption down by country and TLD, compare it with a competing technology, and track new domains over time.

Frequently asked questions

How many websites use Optimizely?

webatla detects Optimizely on 85K websites, refreshed daily, each with its domain, DNS, WHOIS, IP, country and ranking.

Can I download the list of websites using Optimizely?

Yes, as structured JSONL. Grab a free sample first.

What's included for each site, and how fresh is it?

Domain, DNS, RDAP/WHOIS, the full technology stack, IP & country, PageRank and Harmonic, re-detected and re-exported daily.

How do I find the websites using Optimizely?

Buy the technology dataset, then download the complete list of domains we detect using Optimizely, re-exported every day.

What else is in the Optimizely technology data?

Each row places Optimizely next to the other technology on the same site, plus DNS, WHOIS, IP, country and ranking.

Can I download just the sites using Optimizely, or the whole database?

Both. Every site running Optimizely comes in the Technologies dataset, one downloadable file. Or buy All data for the entire database: technologies plus identity, ranking, DNS and RDAP/WHOIS for every domain, combined in one file. Daily fresh export.

How do I download the list of websites using Optimizely?

Three steps: (1) grab the free 10,000-row sample to inspect the schema, (2) buy the Technologies dataset, (3) download the full list of every domain we detect running Optimizely as a JSON Lines file. It is re-exported daily, so you can re-download the freshest list any time inside your access window. Each row carries the domain plus DNS, WHOIS, IP, hosting country and rank.

Get the full list of websites using Optimizely

Pick the dataset that covers what you need. Each one includes Optimizely and downloads as JSONL, rebuilt daily.

Want to compare every dataset side by side? Visit the pricing page