I built CROTool because I couldn't afford VWO.

I'm Paulo, a conversion rate optimization specialist based in Rotterdam. For years I helped e-commerce teams run A/B tests using a stack of 5 different tools: VWO for testing, GA4 for analytics, Jira for planning, Airtable for the backlog, and Hotjar for behavior insights.

The combined cost was over $500/month. And every time I switched between tools, I lost context. The insight from the heatmap lived in one tab. The test I wanted to run lived in another. The results ended up in a spreadsheet nobody looked at.

So I built CROTool — one product that handles the entire A/B testing workflow, from idea to live test to result.

You describe what you want to test. AI writes the variant code. You preview it on your real site, publish to Google Tag Manager in one click, and see results in your existing Google Analytics. No new scripts on your site. No developer tickets. No $300/month bills.

Why it's free

CROTool uses infrastructure you already pay for — Google Tag Manager and Google Analytics. We don't need to run a separate analytics engine or a CDN for test delivery. That means our costs are a fraction of traditional testing tools, and we can pass that on as a generous free tier.

Free gets you 3 active tests with the full AI variant builder. Pro at $49/month gives you unlimited tests, more workspaces, and 1,000 AI requests. That's 6x cheaper than VWO's cheapest plan — and you don't need Jira or Airtable on top.

Where this is going

Right now, CROTool is an A/B testing platform with AI assistance. The vision is bigger: a single tool that sees what visitors do, thinks about why they leave, tests a fix, and proves the revenue impact. See, Think, Act, Prove — one loop that never stops.

Today you run it. Tomorrow the AI runs it for you.