CloudZero is a cost intelligence platform built around unit economics — answering engineering-team questions like "what does each product or feature cost to run?" Strong fit for SaaS companies whose CFO cares about gross margin per customer and whose engineering org needs cost visibility at the service or team level.
Refine is purpose-built for AWS — and free. The depth on AWS-specific findings, narrative reports, anomaly detection with AI commentary, and the 380+ security-check catalog sit outside CloudZero's unit-economics focus. Trade-off: Refine is less specialized for cost-per-customer mapping.
Honest summary: If your highest-value question is gross margin per customer or per product, CloudZero is purpose-built for that and worth the commercial price. If you want AWS optimization plus security in a free tool, Refine is the cheaper, deeper option for that workload.