Genuine whitelabel platforms: Multisite makes sense when your product truly is a network of related sites sharing the same core — a whitelabel platform giving each customer their own subdomain fits this model well.

Centralized management needs: Regional product variants or internal tooling suites across departments benefit from Multisite’s centralized plugin and theme updates across every site in the network.

Shared admin access requirements: If the same admin team needs access across all sites, Multisite’s shared user accounts remove the friction of managing separate logins per site.

The trade-off that matters most: every site on a Multisite network shares the same database and core files. A security issue, a plugin conflict, or a bad update on one site can affect every customer simultaneously — a much bigger blast radius than single-tenant architecture. For a SaaS product handling customer data, this shared blast radius is often the deciding factor against Multisite, even when the management convenience is genuinely appealing.

It’s also worth considering how this risk compounds as your customer base grows. A vulnerability that affects ten customers on a shared network is a serious incident; the same vulnerability affecting a thousand customers is a genuinely different scale of problem, both operationally and in terms of customer trust. Multisite’s shared-risk model doesn’t scale its downside linearly the way single-tenant isolation does.

Converting away from Multisite after customer data is already commingled in a shared database is also a substantially harder migration than starting with the right architecture from day one — worth weighing heavily before choosing Multisite based on short-term convenience alone.