SaaS and cloud computing are two terms you’ll frequently hear when evaluating technology solutions for your business. Though SaaS is built on cloud infrastructure, the two aren’t interchangeable. Understanding the differences—and how they align with your business needs—is essential for making smart technology investments. This guide explains what each model delivers, their key trade-offs, and how Canadian businesses can choose the right approach.
If you’re making platform decisions instead of just learning the definitions, our vCIO and vCISO services page is the right fit for roadmap and architecture guidance, and our IT assessment page is the fastest way to scope the right cloud model for your business.
KEY TAKEAWAYS
- SaaS is software you use (like Microsoft 365). Cloud computing is infrastructure you build on (like Azure or AWS). They’re different models.
- Most SMBs use SaaS daily without realizing it. Understanding the distinction matters when you’re planning IT strategy and budgets.
- IaaS gives you control, PaaS gives you a platform, SaaS gives you a product. Your business probably needs all three.
SaaS (Software as a Service) is ready-to-use software delivered over the internet—like Microsoft 365 or Salesforce. Cloud computing is the broader category that includes SaaS plus IaaS (infrastructure) and PaaS (platforms). Most Canadian SMBs use SaaS daily without realizing it; understanding the distinction matters for IT budgeting and security.
What is cloud computing?
The difference between SaaS and cloud computing: Cloud computing is the umbrella term for delivering computing resources (servers, storage, databases, networking, software) over the internet. SaaS is one of three cloud service models, alongside IaaS (Infrastructure as a Service) and PaaS (Platform as a Service). SaaS delivers complete, ready-to-use software applications; cloud computing encompasses the entire infrastructure stack.
TL;DR
SaaS (Software as a Service) is one delivery model within cloud computing. Cloud computing is the broader infrastructure—IaaS, PaaS, and SaaS—that delivers computing resources over the internet. SaaS provides ready-to-use software (Microsoft 365, Salesforce); IaaS provides virtual infrastructure (AWS EC2); PaaS provides development platforms (Azure App Service). Most businesses use all three without realizing it.
Cloud computing refers to uploading, storing, and accessing data over the internet through remote data centers maintained by third-party providers. Instead of owning and managing on-premises servers, you rent computing resources on demand. Common cloud resources include databases, storage, virtual servers, and networking infrastructure. The market’s growth has been staggering—according to Grand View Research, the global cloud computing market reached $943.65 billion in 2025, with SaaS holding a 53.6% revenue share. Gartner forecasts public cloud spending hit $723.4 billion in 2025, up from $595.7 billion in 2024. About 87% of companies report business acceleration through cloud services, and enterprise cloud adoption now exceeds 94%, with most organizations running three to five clouds simultaneously.
Fusion Computing is a Canadian-owned managed IT and cybersecurity provider serving businesses with 10 to 150 employees since 2012. With a 93% first-contact resolution rate and CISSP-certified security leadership, Fusion Computing delivers monitoring, help desk, and security services aligned to CIS Controls v8.1.
What is SaaS?
Cloud computing is the broad delivery of computing resources—servers, storage, networking, and databases—over the internet. SaaS (Software as a Service) is one layer of cloud computing where applications are hosted by a provider and accessed through a browser. All SaaS is cloud computing, but cloud computing also includes IaaS and PaaS models.
SaaS (Software as a Service) is a delivery model where vendors provide ready-to-use applications accessed over the internet through a web browser. You don’t install or manage the software locally; the vendor handles all infrastructure, security, maintenance, and updates. You pay a subscription fee per user, typically monthly. Examples include Microsoft 365, Salesforce, QuickBooks, Zoom, and Slack. About 80% of businesses now run at least one SaaS application, often without realizing how many different SaaS tools they’re actually using.
According to Precedence Research, the global SaaS market reached $408.21 billion in 2025, growing at a 12.85% CAGR. That’s not slowing down—MedhaCloud reports that SaaS spending is growing at 8% annually compared to overall IT budgets at just 3–5%. Understanding which model fits your business matters more than ever, and 95% of organizations are expected to adopt AI-powered SaaS applications by 2025.
The Three Cloud Service Models: IaaS vs PaaS vs SaaS
Cloud computing comes in three primary service models that transfer different levels of responsibility to the provider. Understanding these cloud computing service models and the control trade-offs helps you choose the right fit. Most organizations use a mix of all three across different applications and workloads. If you’re weighing managed IT services cost as part of this decision, it’s worth noting that SaaS typically shifts costs from capital to operational, while IaaS can reduce per-unit costs at scale.
Infrastructure as a Service (IaaS)
IaaS provides raw computing resources—servers, storage, networking, and databases—that you rent and configure yourself. You install your own applications, manage access controls, and handle data backups. Providers like Amazon Web Services (AWS), Microsoft Azure, and Google Cloud handle the physical infrastructure, redundancy, and security of the data centers. According to Gartner, the IaaS market grew 22.5% in 2024 to $171.8 billion, with Amazon leading at 37.7% market share. IaaS is ideal for organizations with technical teams who need custom configurations, big data workloads, or application testing environments. You’ll gain maximum control but you’ll also accept maximum management responsibility.
Platform as a Service (PaaS)
PaaS offers a pre-configured environment where developers can build, test, and deploy applications without managing underlying infrastructure. Tools, databases, and security features come pre-built. Microsoft Azure, AWS, and Google App Engine are major PaaS platforms used in finance, web development, and API integration. PaaS is ideal when you want development flexibility without infrastructure management overhead. You manage your applications; the provider handles everything else. If you’re evaluating whether to build custom tools or buy off-the-shelf SaaS, that’s exactly the kind of decision a PaaS environment helps you prototype before committing.
Software as a Service (SaaS)
SaaS provides complete, ready-to-use applications accessed through a browser. The vendor manages everything: infrastructure, security, updates, backups, and availability. You simply log in and use it. SaaS is best for non-technical business functions like CRM, accounting, project management, HR, and collaboration tools. You’ve got minimal control over the underlying system, but zero infrastructure management burden. That’s the trade-off most Canadian SMBs are happy to make.
Key Differences: SaaS vs Cloud Computing
Though SaaS runs on cloud infrastructure, the differences in control, cost, and management responsibility are significant. Here’s how they compare across the factors that matter most to Canadian businesses.
| Dimension | SaaS | Cloud Computing |
|---|---|---|
| What you get | Ready-to-use application | Infrastructure, platform, or software |
| Examples | Microsoft 365, Salesforce, Slack | Azure, AWS, Google Cloud Platform |
| Management | Vendor manages everything | You manage apps + data (IaaS/PaaS) |
| Customization | Limited to vendor features | Full control over configuration |
| Cost model | Per-user subscription | Pay-as-you-go (compute + storage) |
Control and Management
With SaaS, the vendor manages all infrastructure, security, and maintenance. You don’t get much visibility into how data is stored or processed—you simply use the application. With cloud infrastructure (IaaS/PaaS), you’re managing configurations, backups, access controls, and monitoring yourself. You own the decision-making but accept the operational burden. Cloud infrastructure gives you visibility into alerts, events, and system performance; SaaS typically doesn’t expose anything the vendor doesn’t want you to see.
Cost Structure
SaaS uses subscription pricing: fixed monthly or annual per-user fees regardless of actual usage. You’ve got predictable costs and no infrastructure investment, but you’re paying more per feature than you might use. With cloud infrastructure, you pay only for resources you consume—compute hours, storage gigabytes, data transfer. You can reduce costs 10–20% by committing to annual terms with AWS or Azure. Cloud infrastructure offers more granular cost control but requires active management to avoid bill surprises. MedhaCloud reports that per-employee SaaS spending now averages $4,830 annually, and that figure keeps climbing.
Implementation and Labour
SaaS requires minimal setup; you’ll typically gain access within hours. There’s no implementation labour for your IT team. Cloud infrastructure demands significant upfront configuration, testing, and optimization before it’s production-ready. Most organizations use an MSP or hire cloud engineers to handle this. The labour cost difference is substantial: SaaS has low labour costs but high subscription costs; cloud infrastructure has low subscription costs but high labour costs. Your choice depends on whether your team has cloud expertise or would rather outsource that responsibility. If you’re weighing these trade-offs against a cloud migration, it’s worth mapping the hidden costs before you commit.
Vendor Lock-In and Portability
Exiting a SaaS platform can be difficult. Data export formats vary; some vendors make it easy, others deliberately complicate migration. With cloud infrastructure, you maintain more control over data and configuration, but migrating between AWS, Azure, and Google Cloud still requires significant effort. Before committing to either model, confirm data portability options and export formats so you’re not locked in if your needs change.
Cloud Computing Deployment Models: Public, Private, and Hybrid
Beyond service models (IaaS, PaaS, SaaS), cloud infrastructure can be deployed in different environments. Each offers different balances of cost, control, and complexity. Fortune Business Insights projects the cloud computing market will reach $3,349.61 billion by 2033—so regardless of which deployment model you choose, you’re investing in the dominant infrastructure paradigm for the foreseeable future.
Public Cloud
Third-party providers like AWS, Microsoft Azure, and Google Cloud Platform manage the infrastructure shared across many customers. You pay only for what you use with no upfront investment. Public cloud offers data centre redundancy across zones, transparent pay-as-you-go pricing, and automatic scalability as your business grows. The trade-off: less visibility into processes, limited configuration customization, and monthly operational costs that can escalate with heavy usage.
Private Cloud
Private cloud runs on dedicated hardware either in your own data centre or co-located with a provider. You maintain full control over configuration, security policies, and customization. VMware, Helion Cloud Suite, and on-premises solutions offer this model. Private cloud is ideal for highly regulated industries or organizations with specific compliance requirements. The major drawback is cost: higher upfront capital investment, higher ongoing maintenance, and you’ve got to purchase and maintain hardware yourself. You lose the financial flexibility of pay-as-you-go public cloud.
Hybrid Cloud
Hybrid cloud combines on-premises infrastructure you control with public or private cloud resources. Sensitive or regulated workloads stay on-site; variable or test workloads use public cloud. You get the cost advantages of public cloud for non-critical work while maintaining control of sensitive assets. The drawback: hybrid deployments are complex to architect and operate, require consistent security policies across both environments, and aren’t as scalable as pure public cloud. Most organizations treat hybrid as a transition model, not a permanent destination.
SaaS vs IaaS vs PaaS: Which Model for Which Business Need?
If you’re trying to figure out which cloud model fits a specific use case, this table cuts through the jargon. Most businesses won’t pick just one—you’ll likely use all three for different workloads. The key is matching the right model to the right problem.
| Use Case | Best Model | Example | Canadian Provider Option |
|---|---|---|---|
| Email & collaboration | SaaS | Microsoft 365, Google Workspace | Fusion Computing (M365 managed) |
| Custom web app development | PaaS | Azure App Service, Heroku | Azure Canada (Toronto & Quebec regions) |
| Virtual desktops & remote work | IaaS | Azure Virtual Desktop, AWS WorkSpaces | OVHcloud Canada, Azure Canada |
| CRM & sales pipeline | SaaS | Salesforce, HubSpot | HubSpot (Canadian data centres) |
| Data analytics & big data | IaaS/PaaS | AWS Redshift, Azure Synapse | AWS Canada (Montreal region) |
| Accounting & payroll | SaaS | QuickBooks Online, Sage | QuickBooks Canada, Wave (Canadian-founded) |
| Backup & disaster recovery | IaaS | Veeam, Datto, Azure Backup | Fusion Computing (BDR managed) |
| Cybersecurity monitoring | SaaS/IaaS | CrowdStrike, SentinelOne, Splunk | Fusion Computing (MDR managed) |
When Should You Choose SaaS vs Cloud Infrastructure?
The right choice depends on your technical expertise, control requirements, and budget priorities.
Choose SaaS if: You need applications quickly with minimal IT involvement. Your team prefers predictable subscription costs and doesn’t want to deal with infrastructure management. You don’t require deep customization or control over the underlying system. You’re a small-to-medium business without dedicated cloud engineers.
Choose Cloud Infrastructure (IaaS/PaaS) if: You need custom configurations for specific workloads. Your team has cloud expertise or you can hire it. You want granular control over costs and performance. You’re building applications or data solutions that SaaS platforms can’t deliver. You require visibility into security configurations and compliance controls.
Choose Hybrid if: You’ve got existing on-premises infrastructure you need to use during transition. You have compliance requirements that demand on-premises data residency for some workloads. You want to test cloud without full commitment. Just understand that hybrid adds complexity; it’s usually a stepping stone, not an end state.
How an MSP Helps You Navigate Both Models
Whether you deploy SaaS applications, cloud infrastructure, or both, a managed IT services provider simplifies the decision-making and reduces risk. Since 2012, Fusion Computing has helped hundreds of Canadian organizations navigate these choices, from 10-person firms to organizations over 1,000 employees.
An MSP helps you evaluate your current workloads, assess cloud readiness, and design a deployment that balances cost and control. For SaaS, an MSP manages licences, user provisioning, security settings, and integrations so applications stay aligned with your business. For cloud infrastructure, an MSP handles architecture design, cost optimization, backups, monitoring, and incident response so you avoid surprises. For hybrid environments, an MSP ensures consistent security policies, manages data flow between on-site and cloud resources, and handles the operational complexity so your team can focus on business priorities.
Related Resources
This article is part of Fusion Computing’s managed IT services hub, which covers the full Canadian SMB technology program from cloud strategy and SaaS administration through CISSP-led security and 24/7 Canadian-staffed support.
For more on choosing and operating cloud services in Canada, read our companion analysis of cloud migration challenges Canadian SMBs hit most often, our practical guide to Microsoft 365 Copilot for Canadian businesses, and our MSSP-perspective comparison of Google Workspace vs Microsoft 365.
Why this matters for Canadian businesses: Statistics Canada reports that more than two-thirds of Canadian businesses now use at least one paid cloud service, with Software as a Service the dominant on-ramp for small and mid-sized firms. The Canadian Centre for Cyber Security has issued repeated guidance that misconfigured SaaS tenants, weak identity controls, and unmanaged third-party access are among the leading root causes of breaches that get reported to the Office of the Privacy Commissioner under PIPEDA. Innovation, Science and Economic Development Canada (through the CyberSecure Canada certification) and provincial regulators such as the IPC of Ontario point SMBs toward documented cloud governance, conditional access with multi-factor authentication, and Canadian data residency where the workload allows. Choosing between IaaS, PaaS, and SaaS is therefore not just a cost question, it is a privacy, sovereignty, and insurability question. Sources: statcan.gc.ca, cyber.gc.ca, ised-isde.canada.ca, ipc.on.ca.
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No. SaaS is one specific delivery model built on cloud infrastructure. Cloud computing is the broader category that includes SaaS, PaaS, and IaaS. Think of cloud computing as the building and SaaS as a particular type of apartment inside it. Not all SaaS runs on public cloud, and cloud computing includes far more than just software applications. IaaS (Infrastructure as a Service) provides raw compute, storage, and networking resources you manage yourself. PaaS (Platform as a Service) adds pre-built tools and development environments. SaaS (Software as a Service) delivers complete, ready-to-use applications. Each transfers increasing levels of management responsibility to the provider, with SaaS transferring the most and IaaS the least. Cloud infrastructure gives you significantly more control. With SaaS, the provider owns and manages the underlying systems, so your visibility is limited to what they expose. With cloud infrastructure (IaaS/PaaS), you manage your own servers, configure backups, and control access policies directly. The trade-off is that you also assume more responsibility for security and operations. SaaS uses fixed per-user subscription fees with higher ongoing costs but minimal labour investment. Cloud infrastructure charges only for resources used, with costs you can reduce 10–20% through annual commitments, but requires implementation and ongoing management labour. For most SMBs, SaaS starts cheaper; for large deployments with technical teams, cloud infrastructure can be more economical long-term. In theory, yes, but migration is rarely straightforward. Data export formats vary widely—some vendors make it easy, others deliberately complicate it. Before committing to any platform for critical business functions, confirm data export options and portability guarantees so you’re not locked in if your needs change. Externally Managed SaaS means a third party—typically an MSP or the vendor itself—handles implementation, configuration, user provisioning, security settings, and ongoing maintenance. This is common for Microsoft 365, where the software is SaaS but your MSP manages licences, integrations, and governance policies so it aligns with your business needs. For most small businesses, SaaS is the logical starting point: no infrastructure expertise required, automatic updates, per-user billing flexibility, and immediate implementation. Tools like Microsoft 365, QuickBooks, and Zoom handle 80% of typical business needs. As your business grows and IT needs become specialized, cloud infrastructure (IaaS/PaaS) makes sense for custom workloads. Most organizations use both simultaneously. Studies show 47% of businesses report IT costs dropping 30–50% after moving to cloud infrastructure. The savings come from eliminating large upfront hardware investments, reducing data centre power and cooling costs, and paying only for resources you use. SaaS also reduces IT labour for application management. Your actual savings depend on your current infrastructure spending and which model you choose.Is SaaS the same as cloud computing?
What are the three main cloud computing service models?
Which model gives me more control over my data: SaaS or cloud infrastructure?
What are the main cost differences between SaaS and cloud infrastructure?
Can I migrate from a SaaS model to cloud infrastructure later?
What is Externally Managed SaaS and who handles it?
Which model is best for a small Canadian business?
How much can we save by moving to cloud?
Fusion Computing serves businesses across Toronto & GTA | Hamilton | Metro Vancouver
Helpful External Resources
For deeper research, these industry sources provide credible data on cloud trends:
- Grand View Research: Cloud Computing Market Analysis—Market sizing, SaaS revenue share, and growth projections through 2030
- Precedence Research: SaaS Market Report—SaaS market valuation, CAGR projections, and regional breakdowns
- Gartner: Public Cloud Spending Forecast—Annual cloud spend data across IaaS, PaaS, and SaaS categories
- Fortune Business Insights: Cloud Computing Market—Long-range projections through 2033
Ready to Make the Right Cloud Decision?
Choosing between SaaS, cloud infrastructure, and hybrid models can feel overwhelming. Fusion Computing has led hundreds of cloud implementations for Canadian businesses ranging from 10 to 1,000+ employees. Our CISSP-certified team conducts a thorough assessment of your current environment, compliance requirements, and growth plans to recommend the right approach.
Cloud computing and SaaS have fundamentally changed how businesses operate. Rather than choosing one over the other, most successful organizations use both in a balanced way. The key is understanding your workloads, your team’s technical capacity, and your control requirements, then aligning those with the right delivery model.
That’s where first-contact resolution matters. At Fusion Computing, we don’t just sell solutions—we listen to your business challenges and recommend what actually solves them. If you’re evaluating cloud options, unsure about your current trajectory, or need help optimizing what you’ve already deployed, our team can walk you through what makes sense for your situation.
Mike Pearlstein is CEO of Fusion Computing and holds the CISSP, the gold standard in cybersecurity certification. He has led Fusion’s managed IT and cybersecurity practice since 2012, serving Canadian businesses across Toronto, Hamilton, and Metro Vancouver.
