IaaS vs PaaS: Choosing the Right Cloud Service Model
Compare Infrastructure as a Service with Platform as a Service. Understand resource management, control levels, and which cloud model fits your development and IT needs.
IaaS (Infrastructure as a Service)
IaaS provides virtualized compute, storage, and networking resources on demand. You manage the OS, middleware, runtime, and applications — the provider manages the physical infrastructure.
Advantages
- Maximum control — configure the entire software stack
- Run any application, OS, or architecture
- Flexible — scale compute and storage independently
- Closest cloud equivalent to owning your own servers
Limitations
- You manage OS patching, security, middleware, and runtime
- Higher operational overhead compared to PaaS
- Requires in-house or MSP expertise for system administration
- Easy to over-provision and waste money
Best For
Custom applications, legacy workloads migrated to cloud, organizations that need full control over their environment, and lift-and-shift migrations.
PaaS (Platform as a Service)
PaaS provides a managed platform for developing, running, and managing applications without dealing with the underlying infrastructure. The provider manages OS, middleware, runtime, and scaling.
Advantages
- Developers focus on code — platform handles infrastructure
- Built-in scaling, load balancing, and high availability
- Faster development cycles with managed databases, caching, messaging
- Reduced operational burden — no OS patching or server management
Limitations
- Less control over the underlying infrastructure
- Potential vendor lock-in with proprietary services
- May not support all application architectures
- Costs can be higher for steady-state workloads
Best For
Development teams building new applications, SaaS companies, organizations prioritizing developer productivity, and workloads that benefit from managed services.
Head-to-Head
Key Differences
How IaaS (Infrastructure as a Service) and PaaS (Platform as a Service) compare across critical factors.
You manage
IaaS (Infrastructure as a Service)
OS, middleware, runtime, data, apps
PaaS (Platform as a Service)
Data and applications only
Provider manages
IaaS (Infrastructure as a Service)
Servers, storage, networking
PaaS (Platform as a Service)
Everything except your app and data
Control level
IaaS (Infrastructure as a Service)
High — full stack access
PaaS (Platform as a Service)
Limited — app layer only
Ops overhead
IaaS (Infrastructure as a Service)
High — you administer servers
PaaS (Platform as a Service)
Low — platform managed
Vendor lock-in risk
IaaS (Infrastructure as a Service)
Low — standard VMs/OS
PaaS (Platform as a Service)
Moderate-high — proprietary APIs
Best for
IaaS (Infrastructure as a Service)
Infrastructure teams
PaaS (Platform as a Service)
Development teams
Our Verdict
IaaS is the right starting point for most business cloud migrations — it provides familiar server environments with cloud benefits (scalability, redundancy, pay-as-you-go). PaaS is ideal for development teams building new applications who want to ship faster without managing infrastructure. Summit DNC helps businesses choose the right cloud model, execute migrations, and manage cloud infrastructure on an ongoing basis.
Common Questions
Frequently Asked Questions
Which is right for migrating existing applications to the cloud?
IaaS is typically the right choice for migrating existing applications ("lift and shift") because you can replicate your on-premises server environment in the cloud with minimal application changes. PaaS migration requires refactoring your application to fit the platform, which can be significant. Most businesses start with IaaS migration and selectively adopt PaaS for new development.
Is PaaS cheaper than IaaS?
PaaS reduces operational costs (no server management) but platform services often carry premium pricing. When you factor in the engineering time saved by not managing infrastructure, PaaS is often cheaper total cost of ownership for development-focused workloads. For infrastructure workloads, IaaS is typically cheaper because you are not paying for platform features you do not use.
What about SaaS — how does it compare?
SaaS (Software as a Service) sits above PaaS — you simply use the application (like Microsoft 365 or Salesforce) with no control over platform or infrastructure. Most businesses consume SaaS (email, CRM, accounting), use IaaS for infrastructure (servers, storage), and PaaS for custom application development. These models are complementary, not competing.
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