Sourced for compatibility-first migration and a docs-preview/SDK workflow.
Alternatives
Stainless alternatives, compared by migration outcome.
A short list of Stainless alternatives — Sourced, Speakeasy, Fern, APIMatic, OpenAPI Generator — with the migration trade-offs that decide the move: SDK compatibility, docs hosting, pricing, and rework. On this page: a multi-column feature matrix, public pricing read, and which alternative fits which team.
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01Alternatives matrix
Stainless alternatives, side by side
Five Stainless alternatives compared by the features that decide the migration: SDK coverage, docs, migration help, and pricing transparency. Sourced-highlighted column is shaded.
| Feature | Sourced | Speakeasy | Fern | APIMatic | OpenAPI Generator |
|---|---|---|---|---|---|
| SDK generation | |||||
| TypeScript | |||||
| Python | |||||
| Go / Java / Ruby / .NET | Planned | ||||
| Preview output before publishing | |||||
| API docs | |||||
| Docs preview | Partial | ||||
| llms.txt / agent-readable | Partial | Partial | |||
| Redirect plan + domain checklist | Partial | ||||
| Migration help | |||||
| Compatibility report vs current SDK | |||||
| stainless.yml import | |||||
| Docs-platform dependency scan | |||||
| Pricing transparency | |||||
| Public per-project pricing | Partial | Partial | Partial | ||
| Free previews / tier | |||||
Which one fits which team
- SourcedStainless customers who need a compatibility-first migration with docs + SDKs in one workflow.
- SpeakeasyTeams already happy with OpenAPI-native generation and willing to wire up docs and release separately.
- FernTeams that want docs + SDKs together and don't need a migration report from Stainless.
- APIMaticTeams that want a portal + SDK product and have budget to negotiate.
- OpenAPI GeneratorTeams with engineering capacity to maintain templates and run codegen locally.
01Compare
Alternatives to evaluate
Official self-hosted codegen for teams that want to run generation locally.
Speakeasy for OpenAPI-native SDK generation.
Fern for docs plus SDKs.
APIMatic, OpenAPI Generator, liblab, and custom internal generators.
02Compare
Evaluation criteria
Can you compare old and new SDK public surfaces?
Can you keep docs and SDKs in one release workflow?
Can you prepare npm and PyPI publishing checks before release?
Can you generate docs previews, sitemap, and llms.txt without lock-in?
→Related pages
Explore related resources.
Start Stainless migration/dashboard/migrations/stainless/#migration-uploadMigration checklist/migrate/stainless-checklist/Docs migration/migrate/stainless-docs/stainless.yml migration/migrate/stainless-yml/Sourced vs Stainless/compare/sourced-vs-stainless/Stainless alternatives/compare/stainless-alternatives/SDK generator pricing/compare/sdk-generator-pricing/Start free/signup/Stainless migration guide/migrate/stainless-to-sourced/Migrate from Stainless to Speakeasy/migrate/stainless-to-speakeasy/Migrate from Stainless to Fern/migrate/stainless-to-fern/Migrate from Stainless to OpenAPI Generator/migrate/stainless-to-openapi-generator/Migrate from Stainless to APIMatic/migrate/stainless-to-apimatic/