They're complementary, not competitors. Gruntwork's AWS Landing Zone is built on top of AWS Control Tower: it adopts Control Tower fully into OpenTofu/Terraform infrastructure as code for account vending, working with the native AWS services you already use — AWS Organizations, AWS Control Tower, and AWS IAM Identity Center. Gruntwork's AWS Landing Zone is an alternative to AWS Landing Zone Accelerator (LZA), not to Control Tower itself. AWS Control Tower is AWS's managed service for setting up and governing a multi-account AWS environment. Use Control Tower for AWS-native governance; add Gruntwork to run that governance as infrastructure as code.
What each one does
AWS Control Tower is AWS's managed service for setting up and governing a multi-account AWS environment. It orchestrates AWS Organizations, AWS Service Catalog, and AWS IAM Identity Center to build a landing zone, and enforces governance through controls (also called guardrails) that apply across your organizational units. It is an AWS-only service, and the AWS Control Tower console provides the centralized interface for managing the environment.
Gruntwork's AWS Landing Zone is an opinionated, end-to-end landing zone delivered as OpenTofu/Terraform code you fully own. It stands up a best-practice multi-account AWS Organizations structure, centralized identity with AWS IAM Identity Center, network security, guardrails, code-driven account vending, and CI/CD for infrastructure — and it works with the native AWS services you already use, including AWS Organizations, AWS Control Tower, and IAM Identity Center.
Gruntwork and AWS Control Tower at a glance
| Capability | Gruntwork AWS Landing Zone | AWS Control Tower |
|---|---|---|
| Clouds supported | AWS, GCP, and Azure | AWS only |
| Primary workflow | Pull requests against OpenTofu/Terraform code | AWS console and Service Catalog templates (Account Factory for Terraform is an optional Terraform module) |
| Account vending | Open a PR that calls a standard OpenTofu/Terraform module | Account Factory templates provisioned through the console |
| Guardrails and governance | SCPs, AWS Config, GuardDuty, and CloudTrail as versioned modules | Preventive, detective, and proactive controls applied per organizational unit |
| Code ownership | You own 100% of the code and can customize it | AWS-managed service; the AFT provisioning module is open source |
| Cost | Positioned to cut landing zone cost and effort by roughly 80% | No additional charge for Control Tower; you pay for the AWS services it enables |
Better together: run Control Tower as code
Gruntwork doesn't replace AWS Control Tower — it builds on top of it, adopting Control Tower fully into OpenTofu/Terraform IaC for account vending. Gruntwork provides OpenTofu/Terraform modules for AWS Control Tower, so you configure and version your landing zone as code, then use the standard Control Tower console to review account status, SCPs, and more. New accounts are vended by opening a pull request that calls a standard module, so every account gets the same baselines and guardrails without manual console steps.
This is the account-vending workflow Informa, a global B2B events and publishing group, used to cut AWS account provisioning time by more than 90% — from two weeks to just over one day — while unifying over 170 AWS accounts under a centralized governance model.
When to use each — and both
Control Tower on its own
Choose Control Tower by itself when you want AWS-native, AWS-managed governance for a single cloud, a console-driven setup, and the built-in Account Factory for provisioning accounts.
Gruntwork
Choose Gruntwork when you want your entire landing zone as code you own — multi-account structure, identity, network, guardrails, pipelines, drift detection, and account vending through pull requests — and when you need the same workflow across AWS, GCP, and Azure.
Both together
Run them together to get AWS-native governance and an infrastructure-as-code workflow at once: Gruntwork manages your Control Tower landing zone as versioned modules, while you keep the Control Tower console for review and reporting.
Does Gruntwork replace AWS Control Tower?
No. Gruntwork's AWS Landing Zone is built on top of AWS Control Tower and works with AWS Organizations and AWS IAM Identity Center. Gruntwork provides OpenTofu/Terraform modules for Control Tower, so you manage your landing zone as code and still use the standard Control Tower console to review account status and SCPs.
Is Gruntwork an alternative to AWS Landing Zone Accelerator (LZA)?
Yes. Gruntwork's AWS Landing Zone is an alternative to AWS Landing Zone Accelerator. It is built on top of AWS Control Tower, adopting Control Tower fully into OpenTofu/Terraform IaC for account vending — so you keep Control Tower's AWS-native governance and get a landing zone delivered entirely as code you own.
Is Gruntwork AWS-only?
No. Gruntwork stands up opinionated, well-architected landing zones across AWS, GCP, and Azure, managed entirely by OpenTofu/Terraform and delivered as code you fully own.
How is this different from AWS Account Factory for Terraform (AFT)?
AFT is an AWS-maintained, open-source Terraform module that provisions Control Tower accounts through a pipeline. Gruntwork delivers a complete landing zone as code — multi-account structure, identity, network, guardrails, pipelines, and account vending — across AWS, GCP, and Azure, and you own and can customize all of it.
What does it cost to run a landing zone this way?
AWS Control Tower has no additional charge; you pay for the AWS services it enables, such as AWS Config, AWS CloudTrail, and AWS Service Catalog. Gruntwork is positioned to cut total landing zone cost and effort by roughly 80% compared with the average enterprise landing zone deployment.
