On-Premises vs Private Cloud vs Public Cloud: What’s the Difference?

Two Separate Choices: Where It Runs and Who Shares It

Every hosting model answers two questions: where the infrastructure sits and whether other organizations share it. Most of the confusion between these terms comes from treating them as one question. These choices sit underneath real-time communication infrastructure and every other software platform.

The last two rows are both on-premises. The difference is whether your team runs the servers as a cloud, with virtualization, self-service provisioning, and automation, or as individual machines.

How the Models Compare

More control and isolation often cost more and take more work to run, though the balance depends on workload, scale, contracts, and staffing. In this table, on-premises includes an on-premises private cloud, since the location and ownership are the same.

In our experience, the operations row is the one teams underestimate. Hardware requires ongoing maintenance and eventual replacement, while patching, monitoring, backups, and on-call support continue throughout the deployment’s life.

Private Cloud vs On-Premises: What’s the Difference?

Private cloud and on-premises are not the same thing, though they can overlap. On-premises describes location: servers in your own facility. Private cloud describes tenancy and operating model: cloud-style infrastructure dedicated to one organization.

That gives three common setups:

• On-premises private cloud: you run a private cloud platform on your own hardware, in your own building.
• Hosted private cloud: a provider runs dedicated infrastructure for you in its data center. You get isolation without owning hardware.
• On-premises without a private cloud: traditional servers you manage individually.

One term adds to the confusion. A virtual private cloud (VPC), such as those offered by AWS or Google Cloud, is a logically isolated network inside the public cloud. It gives network isolation, but the underlying hardware can still be shared, so it isn’t a private cloud in the strict sense. For communication services, a VPC is often how teams keep traffic between messaging, video, and AI components on controlled network paths.

Shared vs Dedicated Cloud

Public cloud tenancy comes in degrees. Shared, or multi-tenant, hosting runs many customers on the same resources, with each customer’s data kept separate; it’s usually the cheapest and fastest way to start. Dedicated hosting reserves some resources for one customer, which improves performance isolation and leaves more room for custom security controls.

A dedicated application environment doesn’t necessarily mean dedicated physical hardware. Ask which resources are exclusive to your organization: the application instance, the virtual machines, or the physical servers. Cloud providers sell dedicated hardware separately, for example, as dedicated instances or hosts.

When you use a software vendor, there’s a third question: whose cloud account the environment lives in. Many vendors host only in their own account. Others can deploy into yours, which keeps the data in an account your organization controls and bills.

On-Premises vs Cloud vs Hybrid

Hybrid hosting combines on-premises or private infrastructure with public cloud and connects them. The usual pattern keeps sensitive data and core systems on-premises or in a private cloud, while development, testing, analytics, or overflow capacity run in public cloud.

In healthcare, a common version keeps the EHR and other legacy clinical systems on-premises while chat, video, and AI services run in the cloud, connected through secure integrations.

Hybrid suits organizations with existing data centers that want cloud flexibility without moving everything. The cost is complexity: two environments to secure, monitor, and connect, and a clear rule for which data may live where.

How to Choose a Hosting Model

Work through these in order. The first one that rules a model out usually settles the question.

1. Regulation and data residency. Does law or a contract require data in a specific country, facility, or account you control?
2. Operations capacity. Do you have staff to patch, monitor, and support infrastructure around the clock?
3. Budget model. Can you commit capital upfront, or do you need costs to scale with usage?
4. Speed. How soon do you need to launch?
5. Load pattern. Is usage steady, or does it spike and need elastic capacity?
6. Existing systems. What must the new platform integrate with, and where does that already run?

For real-time chat and video, location matters for performance too. Media servers close to your users reduce latency, so the regions a model can deploy in are part of the decision. For the wider build-or-buy question, see Build vs Buy for Communication Infrastructure.

Compliance and Data Residency

No hosting model is compliant or non-compliant by itself. Regulations set requirements for safeguards, contracts, and data location, and each model can meet them when it’s configured and run properly.

In regulated industries, the isolation level changes how much governance work you carry more than whether you can comply at all.

• Cross-border data transfers: under GDPR and similar laws, moving personal data out of a country or region needs an appropriate legal basis, so where the infrastructure sits matters.
• Sector rules: healthcare, finance, and government buyers often add their own requirements on location, isolation, and audit evidence.
• HIPAA: any external provider handling ePHI on behalf of a covered entity or business associate must meet HIPAA’s safeguards and sign a Business Associate Agreement, whatever the model. See What Is HIPAA-Compliant Hosting?

Common Misconceptions

“On-premises is always more secure.” Security depends on the controls and the people running them. A well-run cloud environment is often more secure than an under-staffed server room.

“Private cloud means on-premises.” Private cloud means cloud infrastructure reserved for one organization. It can run in that organization’s own facility or be hosted by a provider.

“A virtual private cloud is a private cloud.” A VPC is an isolated network in a public cloud. Useful, but not the same as dedicated infrastructure.

“Cloud is always cheaper.” Cloud often reduces upfront hardware spending. For large, steady workloads, dedicated or on-premises infrastructure can cost less over several years, depending on usage, contracts, and staffing.

“Moving to the cloud means giving up control of your data.” Running in your own cloud account gives you control over configuration, region, and permissions. It doesn’t automatically settle provider access, subprocessors, backups, or international transfers, so check those in your contracts.

The QuickBlox Perspective

QuickBlox offers its communication platform (chat, video calling, and AI agents) in three deployment options, so customers can choose the setup that meets their requirements:

• Shared cloud: our managed cloud on AWS, the fastest way to start.
• Dedicated cloud: an application environment reserved for one customer, in our cloud or in the customer’s own account with AWS, Microsoft Azure or Google Cloud. We install, monitor and support it under an SLA.
• On-premises: installed on the customer’s own servers. Most on-premises customers run their own operations and limit our access; we support their DevOps team with monitoring and troubleshooting guidance.

A pattern we see often is a team that asks for on-premises and turns out to need control rather than location: regulated data in an account they own, in a region they choose. A dedicated deployment in their own cloud account usually meets that requirement, without the hardware and staff on-premises demands. Where a policy really does require servers you own, on-premises is the right call, and we support it.

Compare our hosting options, from cloud hosting to on-premises deployment.