Mockoon vs LocalStack

From $9 per user/month (indicative, Cloud)

From $35 per user/month (indicative, Pro)

Free locally; the paid cloud tier adds hosted mocks and team sync.

Community edition is genuinely useful; Pro adds services such as RDS, ECS and advanced IAM enforcement.

The desktop app and CLI are free and open source.

Community edition covers the most-used AWS services and is free.

Widely used

Mockoon · since 2017

Category standard

LocalStack · since 2017

• Genuinely a minute from download to a working mock API.
• Dynamic templating with faker-style helpers produces realistic responses.
• Proxy mode mocks only the routes you need and passes the rest through.

• Integration tests against AWS services run offline in seconds at no cloud cost.
• Removes the shared-sandbox-account contention that plagues cloud teams.
• Works with Terraform and CDK, so infrastructure code is testable.

• Desktop-first; sharing mocks across a team needs the paid cloud or a committed config file.
• HTTP only.
• Less suited to complex stateful behaviour than WireMock.

• Emulation is not identical to AWS; some behaviours and IAM semantics differ.
• Many services are Pro-only.
• Keeping up with AWS feature changes means occasional gaps.

Front-end developers unblocking themselves while a backend is still being built.

AWS-native teams whose tests currently depend on a shared cloud account.