Technologies / A/B Testing / Personalisation
Optimizely
Optimizely is a digital experience platform whose core product is A/B testing and experimentation for websites and apps; since merging with Episerver the suite also covers content management, commerce and feature flags.
The experimentation snippet is found on sites of retailers, media groups, travel companies, banks, telecoms and SaaS companies, mostly mid-market and enterprise in North America and Europe. Running Optimizely means a conversion or growth team, an enterprise contract and a mature marketing stack with analytics and tag management.
A list of Optimizely sites is a list of companies that spend on conversion rate optimisation. It is used by CRO and analytics agencies, sellers of competing or complementary tools (session replay, heat maps, feedback, personalisation, product analytics, customer data platforms), user research platforms and consultancies. New Optimizely sites show a company that has just funded an experimentation programme; dropped sites may have moved to another testing tool or cut the programme, which interests lower-priced alternatives and agencies.
Optimizely runs on 155,345 websites, which is 35% of all A/B Testing detections we record. Websites optimised with Optimizely are most often served from United States (122,256), Germany (11,999) and Canada (1,693), and .com, .net and .org are the most common domain endings.
Websites using Optimizely
Preview filters with coarse ranges. Exact ranks and registration dates are available in the dashboard when you download a list.
155,345 websites. Sign in to download the full list (free sample below, full lists from $69/mo)
25 days ago 5 websites used Optimizely; today it is 155,345 (+3106800%).
Top countries for Optimizely
Top TLDs
Sample of 15 websites using Optimizely
best-ranked first; the full list has 155,345| Domain | Country | Majestic rank | NetAPI rank | Contacts | First seen |
|---|---|---|---|---|---|
| zoom.us | US | 82 | 30 | phone | 2026-10-20 |
| bbc.com | DE | 96 | 37 | 2026-10-14 | |
| cnn.com | DE | 99 | 39 | 2026-10-10 | |
| gitlab.com | - | 158 | 930 | 2026-10-12 | |
| mailchimp.com | DE | 256 | 1,033 | phone | 2026-10-09 |
| eepurl.com | DE | 370 | 1,170 | phone | 2026-10-10 |
| typeform.com | US | 376 | 1,170 | 2026-10-25 | |
| elsevier.com | - | 418 | 1,217 | 2026-10-25 | |
| wpastra.com | - | 405 | 1,223 | 2026-10-25 | |
| clevelandclinic.org | - | 534 | 1,228 | phone | 2026-10-27 |
| zoom.com | US | 478 | 1,249 | phone | 2026-10-16 |
| sky.com | DE | 698 | 1,321 | 2026-10-10 | |
| asu.edu | US | 770 | 1,379 | email phone | 2026-10-11 |
| zend.com | US | 628 | 1,489 | 2026-10-16 | |
| parallels.com | - | 658 | 1,523 | phone | 2026-10-10 |
Websites that started using Optimizely in the last 60 days
sample of 15; the full list has 155,345Period:last 7 dayslast 14 dayslast 30 dayslast 60 dayslast 90 days
| Domain | Country | Majestic rank | NetAPI rank | Contacts | First seen |
|---|---|---|---|---|---|
| zoom.us | US | 82 | 30 | phone | 2026-10-20 |
| bbc.com | DE | 96 | 37 | 2026-10-14 | |
| cnn.com | DE | 99 | 39 | 2026-10-10 | |
| gitlab.com | - | 158 | 930 | 2026-10-12 | |
| mailchimp.com | DE | 256 | 1,033 | phone | 2026-10-09 |
| eepurl.com | DE | 370 | 1,170 | phone | 2026-10-10 |
| typeform.com | US | 376 | 1,170 | 2026-10-25 | |
| elsevier.com | - | 418 | 1,217 | 2026-10-25 | |
| wpastra.com | - | 405 | 1,223 | 2026-10-25 | |
| clevelandclinic.org | - | 534 | 1,228 | phone | 2026-10-27 |
| zoom.com | US | 478 | 1,249 | phone | 2026-10-16 |
| sky.com | DE | 698 | 1,321 | 2026-10-10 | |
| asu.edu | US | 770 | 1,379 | email phone | 2026-10-11 |
| zend.com | US | 628 | 1,489 | 2026-10-16 | |
| parallels.com | - | 658 | 1,523 | phone | 2026-10-10 |
Websites that stopped using Optimizely in the last 60 days
sample of 15; the full list has 5,742Period:last 7 dayslast 14 dayslast 30 dayslast 60 dayslast 90 days
| Domain | Country | Majestic rank | NetAPI rank | Contacts | Dropped |
|---|---|---|---|---|---|
| starbucks.com | DE | 1,750 | 2,785 | 2026-10-26 | |
| winzip.com | DE | 3,273 | 7,466 | 2026-10-25 | |
| ucs.org | - | 3,728 | 8,417 | 2026-10-28 | |
| corel.com | DE | 4,898 | 9,203 | 2026-10-26 | |
| cengage.com | US | 8,731 | 9,992 | phone | 2026-10-28 |
| pokerstars.com | DE | 6,588 | 11,576 | 2026-10-27 | |
| checkout.com | - | 22,489 | 18,062 | 2026-10-30 | |
| aloyoga.com | CA | 26,340 | 20,557 | 2026-10-24 | |
| taskrabbit.com | US | 15,196 | 22,844 | phone | 2026-10-24 |
| worldnomads.com | - | 13,096 | 24,178 | phone | 2026-10-25 |
| commscope.com | - | 15,001 | 24,799 | 2026-10-26 | |
| virginvoyages.com | US | 40,421 | 24,884 | 2026-10-24 | |
| dpd.co.uk | DE | 53,241 | 26,729 | 2026-10-27 | |
| pinnaclesys.com | DE | 17,665 | 31,031 | 2026-10-27 | |
| kaywa.com | US | 17,432 | 31,113 | 2026-10-28 |
Alternatives to Optimizely in A/B Testing
All A/B Testing technologies
Often used together with Optimizely
Questions about Optimizely websites
How many websites use Optimizely?
As of November 2, 2026, 155,345 websites load Optimizely on their homepage. The number is recalculated every night from our own crawl of the web.
Who buys lists of websites using Optimizely?
Competing testing, personalisation and pop-up vendors, analytics and consent tools, and agencies that sell conversion optimisation. A website that runs experiments has traffic worth optimising and a team that measures results; one that just added Optimizely has just started that work, one that dropped it has changed tools or stopped.
Where are Optimizely websites hosted?
United States leads with 122,256 websites, followed by Germany (11,999) and Canada (1,693). The country is where the website is served from; sites on a hosted platform show the platform's country.
How do I find websites that just started using Optimizely?
The New tab on this page lists websites where our crawler saw Optimizely for the first time in the last days, newest first; the Dropped tab lists the ones that removed it. Both download with a subscription and refresh every morning.
How do I get a list of websites using Optimizely?
A free BetaScan account downloads a {sample_rows}-row sample. A subscription from $69 a month gives the full list of 155,345 domains, or a dataset with emails, phones, country, hosting and ranks, filtered by country, TLD, rank and registration date. See pricing.
How does BetaScan detect Optimizely?
Our crawler fetches the homepage of every domain we track and matches the page and its response headers against the signatures of 7,636 technologies. A website counts as using Optimizely when its latest crawl shows the signature; when the signature disappears, the site moves to the dropped list.
How can you tell a website uses Optimizely?
The page loads a project script from cdn.optimizely.com (or the PCI-compliant variant of that domain) with the account's project id in the file name, and exposes a global optimizely JavaScript object used by the experiments. Sites using the Optimizely CMS or commerce products show different markers; this signature covers the experimentation snippet.
Is Optimizely used by large companies or small ones?
Mid-market and enterprise companies. The contract pricing and the staff needed to run experiments properly put it out of reach of small sites, so the list is made up of retailers, publishers, travel and financial brands, telecoms and software companies with dedicated growth, product or digital teams and a budget for optimisation.
What can you sell to companies running Optimizely?
Products and services around experimentation: CRO and analytics agencies, user research and feedback tools, session replay and heat maps, personalisation engines, product analytics, customer data platforms, data warehousing, and competing testing platforms at renewal time. The buyers are growth, product and digital teams who already measure and pay for conversion improvements.