Single-tenant software gives every customer their own house: their own copy, their own updates, their own costs. Multi-tenant builds one well-run apartment building: one system, one upgrade that reaches everyone at once, shared infrastructure economics, and locked doors between units. That efficiency is why SaaS pricing works at all.
Tenancy is a foundation decision, not a feature you add later. A product built single-tenant that succeeds faces a rebuild to scale; a product built multi-tenant from day one onboards customer number two hundred the same way it onboarded number two. When we build SaaS for founders, workspace isolation, per-tenant roles, and billing hooks go in from the first migration, because retrofitting them is the expensive version.
How is my data isolated from other tenants, and has that isolation been tested? Can I export everything if I leave? Does heavy usage by another tenant degrade my experience? Vendors with real answers have engineered for them; vendors who change the subject have not.
Well-engineered isolation is standard across the software you already trust. The honest risk is sloppy implementation, which is why isolation deserves testing, not assumption.
Unrelated questions. Data usage is a policy and contract matter; read it in the terms regardless of architecture.
Yes, through per-tenant configuration, branding, and feature flags. The code is shared; the experience does not have to be.
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