CRO Tools & Software

Most “CRO tools” articles list 15 products and tell you to pick a few from each category. That’s advice built for teams with dedicated optimization specialists and five-figure budgets. If you’re a marketer or founder at a smaller company, you need a different approach.

Here’s the reality: only 0.2% of websites use any A/B testing tool at all. The gap isn’t knowledge. It’s that the industry keeps selling full “CRO platforms” to people who need one or two tools.

A/B testing tools and CRO tools are different things, even though people use the terms like they mean the same thing. An A/B testing tool does one job: it shows two versions of a page to different visitors and tells you which one performs better. A CRO tool is a broader category that includes heatmaps, session recordings, surveys, form analytics, and personalization alongside testing. Think of A/B testing as one wrench. CRO tools are the whole toolbox.

The question is whether you need the toolbox or just the wrench. For most small teams, the answer is the wrench plus one or two free tools you probably already have access to.

The 3-tool stack that covers 90% of what you need

This isn’t a theoretical framework. It’s what actually works for small teams:

Google Analytics 4 handles the “measure” part. Track traffic, conversions, funnels, and user behavior. It’s free and it’s the foundation.

Microsoft Clarity handles the “watch” part. Free heatmaps and session recordings with no limits on traffic or sessions. See where people click, how far they scroll, and where they rage-click. No credit card, no caps, no catch. Hotjar still owns 55% of the heatmap market, but Clarity does the same core job for zero dollars.

Kirro handles the “test” part. Change a headline, swap a button, try a new hero section. EUR 99/month, unlimited tests, unlimited visitors, 9KB script. The visual editor means no developer needed.

Total cost: EUR 99/month. The enterprise equivalent (Optimizely + Hotjar Business + GA4 360) runs $50,000+ per year. Same workflow. Different price tag.

Our take: The VWO and AB Tasty merger in January 2026 signals where the industry is heading. PE-backed consolidation pushes tools upmarket and prices up. The gap for small teams keeps getting wider. Building your stack from focused, affordable tools protects you from that trend.

Which post should you read first?

Every post in this cluster covers a different part of the CRO toolkit. Start with the one that matches where you are right now.

Choosing tools by category? Our CRO tools guide breaks down all six types of conversion optimization tools (analytics, heatmaps, testing, surveys, form analytics, personalization). It includes a decision framework based on your traffic level and budget, plus honest recommendations for each category. Start here if you’re building your stack from scratch.

Ready to buy software? The CRO software buyer’s guide is for people who already know what they need and want to compare specific products. It covers pricing, stacks by budget tier, and the trade-offs between all-in-one platforms and best-of-breed setups. Includes the post-merger VWO/AB Tasty picture.

Need to understand user behavior first? Our session replay tools roundup compares every major heatmap and recording tool, starting with free options. If you want to see what visitors actually do on your site before deciding what to test, start there.

Thinking about switching from Hotjar? The Hotjar alternatives guide covers why teams leave (pricing, session limits on the free plan) and what to use instead. Includes a head-to-head with Microsoft Clarity and the full comparison with FullStory, Mouseflow, and Lucky Orange.

The thread connecting all of this

Most businesses get stuck because they either skip straight to testing (without knowing what to test) or they buy observation tools and never act on what they find. Most businesses get stuck because they skip straight to testing (without knowing what to test) or buy observation tools and never act on what they find.

The posts in this cluster cover the full picture, from choosing the right tool categories to comparing specific products. The parent A/B Testing pillar page ties this into the broader testing and experimentation strategy.

When you’re ready to start testing, Kirro’s free trial gives you 30 days with the full product. No features locked. No credit card required. Pair it with Clarity and GA4, and you’ve got the same CRO workflow the enterprise teams use.