---
title: "CRO – conversion rate optimization in practice | Sweet Lava"
description: "CRO is the loop of diagnosing where users drop off, testing changes on data and shipping winners. See how it raises results without more traffic."
url: https://sweetlava.eu/en/glossary/cro/
lang: en
alternate_pl: https://sweetlava.eu/pl/slownik/cro/
---

E-commerce & analytics 

# What is CRO (conversion rate optimization)?

CRO is the systematic process of raising conversion: diagnosing where users drop off, forming hypotheses, testing changes on data and shipping the variants that win.

CRO is the scientific method applied to sales: instead of "I feel a red button would work better" – hypothesis, A/B test, decision on numbers. The cycle: analytics and session recordings reveal a problem → research suggests the cause → we design a variant → the test decides.

The biggest reserves rarely lie in button colour. Usually they are: an unclear value proposition, hidden delivery costs, an overlong form, missing trust signals (reviews, returns, contact), a slow site on mobile.

**The precondition:** enough traffic to test. With low traffic, qualitative research and proven patterns replace A/B tests – equally effective, just slower to verify.

## Related services

- [ E-commerce development & online stores → ](https://sweetlava.eu/en/services/e-commerce/)

## Related articles

E-commerce · 7 August 2026

## [ How to increase your online store's conversion rate – CRO in practice ](https://sweetlava.eu/en/blog/how-to-increase-ecommerce-conversion-rate/) 

Traffic grows but sales don't? Conversion rate optimization (CRO) is a cycle of diagnosis, hypothesis, test and rollout. We show where stores lose the most and where to start.

## Related terms

- [A/B testing](https://sweetlava.eu/en/glossary/ab-testing/)
- [Conversion & conversion rate](https://sweetlava.eu/en/glossary/conversion-rate/)
- [Heatmap](https://sweetlava.eu/en/glossary/heatmap/)

## Planning an online store, or changes to your current one?

We build stores on WooCommerce, Shopify and custom platforms, with analytics that show what actually sells. Quote within a few days.

[ Get in touch ](https://sweetlava.eu/en/contact/?source=glossary-cro)