09/08/2026
โ๏ธ SaaS costs more than the same features in a single-customer app, and it's worth knowing why before you're surprised by it.
Multi-tenancy โ every query now has to be correct about whose data it's touching. Getting this wrong once is a breach, not a bug.
Billing โ plans, upgrades, downgrades, proration, failed payments, dunning. It's a product, and it's usually scoped as a checkbox.
Roles and permissions โ customers will ask for org-level admins on day one of enterprise conversations.
Uptime โ a single-customer app going down is a bad afternoon. A SaaS going down is every customer at once, and now you need on-call.
None of this is on the feature list. All of it is in the build.