A single-tenant cloud is dedicated to one customer (one tenant, the customer’s resources are not shared), a multi-tenant cloud shares infrastructure across customers (the resources are pooled). The right answer is single-tenant for compliance-heavy workloads (healthcare, finance, government, workloads that need data residency), multi-tenant for cost-sensitive workloads (SaaS, web apps, any workload that does not have strict data residency). The mistake every team makes: the team picks single-tenant for cost reasons, the team is paying 5x what they need, the team’s product is not competitive on price.
Table of contents
- The isolation — the difference is the boundary
- The cost — single-tenant is 3-5x more expensive
- The compliance — the right answer for healthcare, finance, government
- The scaling — multi-tenant scales better
- The maintenance — single-tenant is more isolated, multi-tenant is faster
- The right choice for each workload
- How this fits the rest of the stack
- FAQ
The isolation — the difference is the boundary
The isolation is the difference. A single-tenant deployment has dedicated resources (CPU, memory, storage, network) for one customer, the resources are not shared. A multi-tenant deployment shares the resources across customers, the isolation is at the software layer (namespaces, containers, row-level security).
The right answer for a compliance-heavy workload is single-tenant. The right answer for a cost-sensitive workload is multi-tenant.
The cost — single-tenant is 3-5x more expensive
Single-tenant deployments are 3-5x more expensive than multi-tenant deployments at the same scale. The reason: the single-tenant deployment has dedicated resources, the multi-tenant deployment shares the resources (the resource utilization is higher, the cost is amortized across customers).
The right answer for a team that is cost-sensitive is multi-tenant, the right answer for a team that has a compliance requirement is single-tenant. The wrong answer is to pick single-tenant for cost reasons — the team is paying 5x what they need.
The compliance — the right answer for healthcare, finance, government
The compliance requirement (HIPAA for healthcare, PCI for finance, FedRAMP for government) often requires single-tenant deployments. The reason: the compliance auditor wants to verify that the customer’s data is not commingled with other customers’ data, the single-tenant deployment makes the verification straightforward.
The right answer for a team that has a compliance requirement is single-tenant. The wrong answer is to assume multi-tenant is fine — the team’s compliance auditor will fail the deployment, the team has to migrate to single-tenant.
The scaling — multi-tenant scales better
Multi-tenant deployments scale better. The provider pools the resources, the provider can move resources between customers as the demand changes, the provider can over-provision less (the multi-tenant provider amortizes the over-provisioning across customers). Single-tenant deployments scale linearly — the team’s resources are the team’s resources, the team pays for the team’s resources.
The maintenance — single-tenant is more isolated, multi-tenant is faster
Single-tenant deployments are more isolated. The team’s upgrade does not affect other customers, the team’s outage does not affect other customers. Multi-tenant deployments share the maintenance window — the provider upgrades all customers at once, the provider’s outage affects all customers.
The right answer for a team that values isolation is single-tenant, the right answer for a team that values speed of updates is multi-tenant.
The right choice for each workload
The right answer is a function of the workload:
- Healthcare app with PHI — single-tenant (HIPAA).
- Financial app with PCI data — single-tenant (PCI).
- Government app with FedRAMP — single-tenant (FedRAMP).
- SaaS web app with no compliance — multi-tenant.
- Mobile app backend — multi-tenant.
- E-commerce site with no compliance — multi-tenant.
- Internal tool with sensitive data — single-tenant.
- Internal tool with no sensitive data — multi-tenant.
How this fits the rest of the stack
The infrastructure question is a small piece of a larger pattern: the team’s runtime, storage, database, secret store, logs, and deployment platform are all parts of the same platform. The right answer is to model the full stack before the project ships, not after. The RunxBuild hosting calculator is the right place to do that exercise — pick the runtime, the memory tier, the storage, the secret store, and the egress, and the calculator shows what the deploy actually costs at the team’s actual usage.
Useful related references:
FAQ
What is the difference between single-tenant and multi-tenant?
Single-tenant is dedicated to one customer. Multi-tenant shares infrastructure across customers.
Is single-tenant more expensive than multi-tenant?
Yes — 3-5x more expensive at the same scale. The reason: the single-tenant deployment has dedicated resources.
When should I use single-tenant?
For compliance-heavy workloads (healthcare, finance, government), for workloads that need data residency, for workloads that value isolation.
When should I use multi-tenant?
For cost-sensitive workloads (SaaS, web apps), for workloads that do not have strict data residency, for workloads that value speed of updates.
Is single-tenant more secure than multi-tenant?
Not necessarily. The security depends on the implementation, not the tenancy model. A well-implemented multi-tenant is as secure as a single-tenant, the right answer is to verify the security of both.
Can I migrate from single-tenant to multi-tenant?
Yes, but the migration is complex (the data model may differ, the integration points may differ). The right answer is to plan the migration in advance.
What is the right tenancy model for a SaaS app?
Multi-tenant for a SaaS app that does not have compliance requirements. Single-tenant for a SaaS app that has compliance requirements (healthcare SaaS, finance SaaS).
What is the right tenancy model for an internal tool?
Depends on the data. Single-tenant for an internal tool with sensitive data. Multi-tenant for an internal tool with no sensitive data.