Open Policy Agent Gatekeeper
7.2#3 in kubernetes security softwareFree planFree planAPILinuxSelf-hosted
VisitOpen Policy Agent Gatekeeper vs Terraform
What both publish
| Fact | Open Policy Agent Gatekeeper | Terraform |
|---|---|---|
| Documentation depth | The documentation includes installation, examples, audit, mutation, external data, debugging, metrics, performance, architecture, runtime flags, API reference, and contribution material. | Official documentation covers configuration language, CLI, HCP Terraform, Enterprise, modules, providers, plugin development, registry publishing, integrations, tutorials, and a sandbox. |
| Licence | The Gatekeeper repository is licensed under Apache-2.0. | HashiCorp changed future Terraform releases to the Business Source License 1.1, which restricts hosting or embedding the software to compete with Terraform. |
| Limit: complexity | The 2025 survey reports that some users find Gatekeeper overcomplicated for simple policies and find constraint-template debugging difficult. | Independent reviewers cite a steep learning curve, cryptic errors, uneven documentation, configuration complexity, and difficult multi-environment setups. |
| Purpose | Gatekeeper is a validating and mutating Kubernetes webhook that enforces CRD-based policies evaluated by Open Policy Agent. | Terraform is an infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises resources through human-readable configuration files. |
| Rating on G2 | 4.5 out of 5 from 93 reviews, but the page identifies this as a vendor and contract lifecycle product rather than OPA Gatekeeper. | 4.7 out of 5 from 92 reviews. |
Open Policy Agent Gatekeeper plans
- GatekeeperFree
- Open-source GatekeeperFree
Terraform plans
- FreeFree
- StandardPriced on request
- PremiumPriced on request
- Terraform Community EditionFree
- HCP Terraform FreeFree
- HCP Terraform Essentials$0.10 a month
Pick Open Policy Agent Gatekeeper if…
Gatekeeper suits teams managing Kubernetes clusters that need policy enforcement, mutation or recurring audits of existing resources. It is self-hosted and requires cluster-admin permissions to install.
Pick Terraform if…
Terraform Community Edition suits practitioners who want a downloadable command-line tool for infrastructure provisioning. HCP Terraform's free features are described as suitable for small teams, while larger organizations may need paid collaboration and governance features.