Terraform vs OpenTofu: Which IaC Tool for CI?
OpenTofu is the open-source fork of Terraform created after its license change - largely compatible, with diverging features.
Terraform is HashiCorp’s IaC tool, now under the BSL license. OpenTofu is a community-driven, Linux Foundation fork under an open-source license (MPL), built to be a drop-in compatible alternative that has since added its own features.
| Terraform | OpenTofu | |
|---|---|---|
| License | BSL (source-available) | MPL 2.0 (open source) |
| Governance | HashiCorp/IBM | Linux Foundation / community |
| Compatibility | n/a | High (forked from Terraform) |
| Config language | HCL | HCL |
| Feature drift | Vendor roadmap | Independent roadmap |
In CI
For most pipelines the two are interchangeable: same HCL, same plan/apply flow, similar provider ecosystem. The decision is mostly about licensing and governance - OpenTofu’s open-source license matters to some organizations and vendors. Over time features diverge, so pin a version and avoid relying on one tool’s exclusive features if you want to keep the option to switch.
Migration effort
Migrating an existing Terraform project to OpenTofu is usually low-friction at compatible versions, but state and provider/version compatibility should be tested in CI first. Lock the tool version in your pipeline either way.
The verdict
Want a fully open-source license and community governance: OpenTofu. Prefer HashiCorp’s official tooling and roadmap: Terraform. They are largely interchangeable today - pin a version and test before switching.