Closed beta · invite only

Build pages, ship variants,
measure what works.

MediaLab is the Cloudflare-native page and version management system with built-in A/B testing. Edit your pages in the browser, ship variants without changing URLs, and let server-side cookie assignment do the rest.

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No credit card. Built on Cloudflare Workers + D1 + KV.
Landing page
acme.medialab.page/landing · 2 versions running
12,847
Visits 7d
4.2%
Conv. rate
94%
P(B>A)
A   Original headline
3.7% · 6,412 visitors
B   "Save 4 hours per week"
4.7% · 6,435 visitors
Ship B → 100% traffic
+27% conversion

What's inside

URLs never change

Public URLs stay stable. Version assignment happens server-side via a sticky cookie. No ?v=2 in your links.

Bayesian, not p-values

P(B>A) updates continuously. No magic 95% gate. Stop tests when you've seen enough, not when an arbitrary threshold flips.

Tracking can't break

GA4, Meta Pixel, Clarity injected by the Worker — never embedded in editable HTML. Structurally impossible to ship a page without analytics.

Manage many sites

One account, many workspaces. Each workspace gets its own subdomain (or bring your own domain). Perfect for agencies running multiple clients.

Templates that ship

Start from a polished SaaS landing, lead capture, webinar registration, course page. Edit the headline, hit publish.

Edit-to-live in seconds

Change a headline, hit save, refresh the page. Cloudflare's edge cache means publishes propagate globally instantly.

Ready to ship a page?

Closed beta. No credit card. Spin up your first workspace in under a minute.

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