Experiment Nation

Experiment Nation

Analytics & Attribution
By
Rommil Santiago
Rommil Santiago founded it, and most editions point to a recorded conversation with a named practitioner.
SUBSCRIBERS
2,000+
HOW OFTEN
Weekly
ACCESS
Free
WRITER
Rommil Santiago
Last updated
August 5, 2026

Preview

Experiment Nation

What it is.

Experiment Nation was founded by Rommil Santiago, described on the site as an award-winning Conversion Rate Optimization Leader. The Substack lists over 2,000 subscribers, and the site states the newsletter is weekly.

The format is mostly recorded conversation: practitioners answer CRO questions on camera and the email carries the episode. One episode covers what to do when winning an A/B test loses money long term.

Subscribing also brings an eBook of 60+ learnings from experimenters, access to 65 recorded conference sessions, and the Slack channel.

What you get.

  • A weekly email with new practitioner interviews
  • Recorded question and answer episodes with named CRO leads
  • An eBook of 60+ learnings from experimenters around the world
  • Access to 65 recorded conference sessions
  • An invitation to the Experiment Nation Slack channel
OUR PICKS

Editions we'd start with.

Why CRO "Best Practices" Keep Failing (And AI Might Make It Worse) ↗

Two practitioners take reader CRO questions on camera, good on why copied playbooks stall on your own traffic.

Ethical CRO: How Better Experiments Build Trust, Retention and Revenue ↗

Covers tests that win this quarter and cost money later, worth an hour if your roadmap is all quick wins.

Subscribe at the source.

Goes straight to Rommil Santiago.
Subscribe

Questions about Experiment Nation

How big is the audience?
Who runs it?

Questions about Analytics & Attribution

How long should a B2B A/B test run before you call it?
Can a winning test still be the wrong call?
Strengths
  • Founded by a working CRO lead, and the Substack states over 2,000 subscribers
  • Guests are named practitioners answering reader questions on camera
  • Free, with an eBook of 60+ learnings and 65 recorded conference sessions included
Limitations
  • The audience is small next to general marketing newsletters, at over 2,000 subscribers
  • Most editions are video, so there's little to skim in text
  • Editions lean on interviews, so first-party test data is rare
  • Its own conference and Slack get promoted through the emails
Skip this if
  • Skip it if you already read GoodUI and want one CRO send.
Ideal for
  • CRO specialists
  • Experimentation leads
  • Growth marketers
  • Product managers
  • Stage: Startup • Scaleup • Enterprise

Reading is the cheap part.

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