
We compare six CMS platforms on tenant isolation, per-site cost and ops overhead to find the best fit for agencies running many client sites.

Most best multi-tenancy CMS lists rank platforms by tenant count. That misses what matters at enterprise scale, how the platform handles hundreds of brands, regions, and sites as tenants. Here are the criteria to evaluate on, and how the leading platforms hold up.

Learn how to choose the best CMS for managing multiple client websites by comparing single-tenant, SaaS, and native multi-tenant architectures based on scalability, isolation, deployment, and long-term cost. Discover which approach works best for agencies as their client portfolio grows, what features actually matter at scale, and why multi-tenancy can dramatically reduce operational overhead while improving profitability.

The way software gets built is shifting, and the platforms that benefit are the ones with the right technical foundation. Webiny v6 — new project structure, built-in MCP server, Website Builder, SDK, and more — is built for that reality.