Authentication
Who left Clerk, and who still runs it
339 websites in the top 1M run Clerk, observed directly from the rendered page in the July 2026 crawl.
101
stopped running it that month
2
of those are 11–500 employees
392
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running Clerk
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Cloudflare 99%Cloudflare Bot Management 99%React 84%Node.js 79%Open Graph 76%Webpack 75%Next.js 74%Tailwind CSS 74%HSTS 74%Priority Hints 73%
Share of a 339-domain sample of Clerk users that also run each.