A/B Testing; Personalisation
Who left Optimizely, and who still runs it
2,482 websites in the top 1M run Optimizely, observed directly from the rendered page in the July 2026 crawl.
299
stopped running it that month
36
of those are 11–500 employees
482
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running Optimizely
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Google Analytics 88%Google Tag Manager 86%Open Graph 77%HSTS 74%core-js 70%Cloudflare 68%Amazon Web Services 59%jQuery 56%Facebook Pixel 52%Priority Hints 49%
Share of a 2,482-domain sample of Optimizely users that also run each.