Speakeasy

Speakeasy, similar to Fern, supports generating SDKs for APIs in multiple languages. Below, we walk through the different capabilities of Fern and Speakeasy.

1. Fern is an all-in-one: SDKs + Docs

If you choose Speakeasy, you’ll have to find a separate docs vendor such as ReadMe. With Fern, you’ll be able to generate SDKs and Docs with embedded code snippets.

2. Fern SDKs are more widely consumed.

Fern’s SDKs are battle-tested and have been downloaded millions of times.

3. Fern offers more Generally Available SDK languages.

4. Speakeasy generates Terraform providers.

Speakeasy supports generating Terraform Providers from your OpenAPI Specification. In order to generate the terraform provider, a user must annotate their OpenAPI with several extensions.

5. Fern SDKs come with generated tests.

Fern handles generating unit tests and integration tests that run against a mock server. Every SDK method is tested and publishing is blocked if any failures are encountered.

On the other hand, Speakeasy produces no tests in their SDKs (example).

6. Fern supports OAuth + DPoP.

7. Fern’s file structure is resource based.

Fern’s SDKs are organized so that developers can easily find their way around your API.

8. Speakeasy offers a management dashboard.

Speakeasy offers a management dashboard where you can visualize each SDK and understand the release process. On the contrary, Fern is primarily GitHub + CLI focused.

9. Fern SDK methods support configuring timeouts, retries, auth, etc.

Fern’s RequestOptions are documented and make it easy for developers to control retries, auth, abort, and timeout behavior.