Terraform, Pulumi and AWS CDK are the three infrastructure-as-code tools worth comparing in 2026, and the real decision point is not which one is most powerful but which one matches how your team already writes code.
Infrastructure as code replaced clicking through cloud consoles with something you can version, review and roll back like application code, but the three leading tools take genuinely different approaches to how you describe that infrastructure. Terraform uses its own declarative configuration language, HCL, and works across essentially every cloud provider through a large plugin ecosystem. Pulumi lets you write infrastructure definitions in a general-purpose language you already know, Python, TypeScript, Go or others, keeping the same declarative model underneath but swapping the syntax for real code. AWS CDK takes a similar general-purpose-language approach but compiles down to CloudFormation and is scoped specifically to AWS, trading multi-cloud flexibility for tighter, more native integration with AWS services. None of the three is objectively best; the right one depends on whether your team already thinks in HCL, in a programming language, or specifically in AWS.
- Terraform for multi-cloud coverage and the largest ecosystem of providers
- Pulumi for teams that want infrastructure defined in a real programming language
- AWS CDK for teams committed to AWS who want native, code-first infrastructure
- How each tool's state management and drift detection actually works
- What genuinely differs beyond syntax preference
Infrastructure as code is the layer that ties your compute, deployment and hosting choices together into something repeatable. Our cloud and developer tools buying guide covers how it fits into the wider stack decision.
Key takeaways
- All three tools are free to use as open-source software Terraform CLI, Pulumi’s core SDK and AWS CDK all cost nothing to run; the paid tiers that exist are for hosted state management, team collaboration features and policy controls, not the core tool itself.
- The real choice is language, not capability Terraform’s HCL is purpose-built and easy to read but limited as a programming language; Pulumi and CDK let you use loops, conditionals and functions from a language your team already knows, at the cost of a steeper initial learning curve for infrastructure-specific concepts.
- Terraform has the broadest provider ecosystem by a wide margin Its registry covers essentially every major cloud and SaaS provider, which matters most for a team running genuinely multi-cloud or multi-vendor infrastructure rather than a single provider.
- AWS CDK only makes sense if you're committed to AWS It compiles to CloudFormation and is scoped to AWS specifically, so it’s the wrong pick the moment multi-cloud portability becomes a real requirement rather than a hypothetical one.
Our picks at a glance
Terraform
Terraform is an infrastructure-as-code tool from HashiCorp that lets you describe cloud and on-premises infrastructure in a declarative configuration language called HCL, then plans and applies the changes needed to make real infrastructure match that description. It remains the most widely adopted IaC tool in large part because of its provider ecosystem: the Terraform Registry lists providers for essentially every major cloud, plus hundreds of SaaS tools, from DNS providers to monitoring platforms to Kubernetes itself, all managed through the same workflow.
The core CLI is free and open source, released under a business source license after HashiCorp’s 2023 licensing change, which restricts building a competing commercial product on top of it but doesn’t affect normal team usage. HCP Terraform, HashiCorp’s hosted platform for remote state management, run history and team collaboration, offers a free tier that covers small teams outright, with paid tiers priced around resources under management for larger deployments; because that pricing is usage-based and published directly on HashiCorp’s site, we’re not quoting a specific figure here that risks going stale.
Terraform is the strongest default choice for genuinely multi-cloud infrastructure, or any team managing a wide mix of providers beyond a single cloud, purely on the strength of its ecosystem. Its HCL language is easy to read even for non-specialists, but it is intentionally limited as a programming language, no real loops or functions in the way a general-purpose language has them, which is exactly the gap Pulumi and CDK exist to close for teams that want more expressive power.
Pulumi
Pulumi is an infrastructure-as-code platform that uses the same declarative, state-tracked model as Terraform underneath, but lets you write the actual infrastructure definitions in a general-purpose programming language, TypeScript, Python, Go, C# and others, rather than a domain-specific configuration language. For a team of developers who already write application code daily, that means infrastructure definitions can use real loops, conditionals, functions and even unit tests, instead of HCL’s more constrained expression syntax.
An Individual tier is free for solo use and personal projects, and Team and Enterprise plans price around resources under management and team collaboration features, largely on a quote basis once you move past the entry tier. Because Pulumi’s published team pricing has shifted over recent product cycles and a specific current number isn’t something we can confirm reliably at publication time, check Pulumi’s own pricing page against your resource count before budgeting a figure.
Pulumi makes the most sense for a team that wants infrastructure code reviewed, tested and structured the same way application code is, including genuine unit tests for infrastructure logic, something HCL supports only awkwardly by comparison. It’s a less obvious choice for a team with no existing programming language preference or one that values HCL’s simplicity and wants infrastructure config to stay deliberately separate from application code, where Terraform’s dedicated syntax is arguably a feature rather than a limitation.
AWS CDK
AWS Cloud Development Kit is an infrastructure-as-code framework, built and maintained by AWS, that lets you define AWS infrastructure using TypeScript, Python, Java, C# or Go, then compiles that code down to CloudFormation templates, which AWS’s own service then provisions. Unlike Terraform and Pulumi, CDK is scoped specifically to AWS, it does not manage other cloud providers, and that narrower scope is precisely its main tradeoff against the other two.
There is no separate tool cost: CDK itself is free and open source, and you pay only for the underlying AWS resources it provisions, at standard AWS service rates. Its higher-level constructs, pre-built patterns that generate multiple correctly configured CloudFormation resources from a few lines of code, are a genuine time-saver for common AWS architecture patterns, effectively encoding AWS’s own best practices into reusable building blocks rather than leaving you to assemble every IAM policy and security group by hand.
AWS CDK is the right choice for a team fully committed to AWS that wants infrastructure code written in a real programming language with deep, native access to AWS-specific features the moment they ship, often before Terraform’s AWS provider catches up. It’s the wrong choice the moment multi-cloud support becomes a genuine requirement rather than a hypothetical one, since CDK offers no path to managing infrastructure outside AWS at all.
|
Best overall
Terraform
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Best for developers
Pulumi
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Best for AWS
AWS CDK
|
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|---|---|---|---|
| Configuration language | HCL (declarative) | Real languages | Real languages |
| Multi-cloud support | Yes | Yes | No |
| Core tool cost | Free (OSS) | Free (individual) | Free (OSS) |
| Provider ecosystem size | Largest | Large | AWS only |
| Best fit | Multi-cloud teams | Developer-led teams | AWS-committed teams |
| Check Price | Check Price | Check Price |
What to look for in an infrastructure-as-code tool
AWS CDK’s AWS-only scope is disqualifying the moment a second cloud provider enters the picture, even as a future possibility worth planning around.
Pulumi and CDK’s advantage largely disappears if your team doesn’t already write in a supported general-purpose language comfortably; learning both infrastructure concepts and a new language at once slows adoption.
All three track infrastructure state to detect drift between what’s defined in code and what actually exists, but where that state lives and how conflicts are resolved differs meaningfully at team scale.
Catching a misconfigured resource before it applies to production is far cheaper than catching it after.
A provider or construct library that’s actively maintained catches up with new cloud service features faster than an abandoned one.
Frequently asked questions
Is Terraform still the safest default choice in 2026?
For teams managing infrastructure across more than one cloud or a wide mix of SaaS providers, yes, its provider ecosystem remains the largest and most mature of the three. For a team fully committed to one language and one cloud, Pulumi or AWS CDK can be a better fit without sacrificing meaningful capability.
Can I mix Terraform, Pulumi or CDK in the same organization?
Technically yes, but it’s rarely a good idea for the same infrastructure layer, since each tool tracks its own state independently and none of them are aware of resources managed by another. It’s more common and more sustainable for an organization to standardize on one tool for a given team or workload, even if different teams end up on different tools.
Do Pulumi and AWS CDK cost more than Terraform since they're 'real code'?
No, all three are free as open-source tools at their core. The paid tiers that exist across all three are for hosted state management, team collaboration and policy features, not for the ability to write and run infrastructure code itself.
Which tool is easiest for a team new to infrastructure as code?
Terraform’s HCL is generally considered the gentlest entry point specifically because it’s purpose-built and constrained, there’s less to learn than a full programming language. Pulumi or CDK can actually be faster to pick up for a team of developers who already write TypeScript or Python daily and would rather not learn a new syntax at all.
Final recommendation
- Match the tool to a real multi-cloud requirement, not a hypothetical one, before ruling AWS CDK out or in
- Pick a language, HCL or otherwise, that someone senior on the team can already read fluently
- Put a reviewed plan or preview step in front of every apply, regardless of which tool you choose
Choose Terraform as the safe default for multi-cloud or multi-vendor infrastructure and the largest available provider ecosystem. Choose Pulumi if your team wants infrastructure defined, tested and reviewed the same way as application code, in a language you already use. Choose AWS CDK if you’re fully committed to AWS and want native, code-first access to its services without multi-cloud overhead.
- Model a small, real piece of your infrastructure in your top pick before committing to a full migration.
- Read our full cloud and developer tools buying guide for the complete category breakdown.
