Sourced Launch
$99per API project · monthly
Docs previews + two live SDKs. Project-based, no seat counting.
- Unlimited previews, no credit card
- Two live SDKs included
- Custom-domain readiness
- Release checks + llms.txt
Comparison
Sourced vs Stainless.
Everything Stainless gives you — TypeScript/Python SDKs, OpenAPI ingestion, docs previews — plus a migration report, per-API-project pricing, and a launch checklist. On this page: a feature-by-feature parity table, side-by-side pricing, and the four steps to switch.
Unlimited previews. No credit card required.
01Feature parity
Sourced vs Stainless: feature by feature
Sourced covers TypeScript/Python SDK previews and docs previews for teams leaving Stainless, then adds migration reporting, release-readiness checks, and project-based pricing on top.
| Feature | Sourced | Stainless |
|---|---|---|
| OpenAPI ingestion | ||
| OpenAPI 3.0 / 3.1 input | ||
| Imports an existing stainless.ymlSourced uses it to plan a migration and preserve package names. | ||
| Config-drift detection (methods configured but missing from spec)Surfaced as a first-class report row in Sourced. | Partial | |
| SDK generation | ||
| TypeScript SDK | ||
| Python SDK | ||
| Go SDKStainless ships Go today; on Sourced's roadmap. | ||
| Java / Kotlin / Ruby / .NET SDKsStainless covers more languages today. | ||
| MCP target | Planned | |
| Preview SDK output before publishing | ||
| API docs | ||
| Docs preview | ||
| Custom-domain readiness | ||
| llms.txt + agent-readable docs | Partial | |
| SEO guardrails (sitemap, JSON-LD, OG) | Partial | |
| Migration & switching | ||
| Compatibility report vs current SDK surfaceSourced-specific: read your existing Stainless SDK and diff method/error/pagination surfaces before swapping packages. | ||
| stainless.yml → migration plan | ||
| Docs-platform dependency scan | ||
| Reversible plan (preview before publishing) | Partial | |
| Publishing & release | ||
| Repo-sync readiness plan | Partial | |
| npm / PyPI publish readiness checks | Partial | |
| Release-readiness checklist | Partial | |
| Long track record / public customer rosterStainless has shipped longer; this is an honest call-out, not a knock on Sourced. | ||
| Pricing | ||
| Per API project, transparentStainless pricing is commonly negotiated; Sourced publishes plans. | Partial | |
| Unlimited previews, no credit card | ||
| Live SDK add-ons priced separatelySourced: $99/mo per extra live SDK, only after publishing. | ||
02Pricing, side by side
What it actually costs to ship
Pricing verified May 2026. Stainless pricing changes frequently — verify on their official page before buying.
Stainless
Customstarts around $199 per live SDK
Free generator tier; paid plans typically counted per live SDK or per generator slot.
- Public starter exists
- Most plans go through sales
- Live SDK add-ons usually negotiated
- Long track record of language coverage
01Details
Where Stainless is strong
High-quality generated SDKs across many languages.
Long-running customer roster and SDK engineering team.
Granular SDK customization through stainless.yml.
Docs Platform and MCP targets are bundled with the SDK workflow.
02Details
Where Sourced is different
Migration report runs before customers see any change.
Pricing per API project, not per live SDK or seat.
Docs, SDKs, redirects, and release checks live in one dashboard.
Reversible plan: preview docs + packages before publishing anything.
03Switching path
How to switch from Stainless to Sourced
Four steps before any package or domain changes. Reversible until your team gives the green light.
- 01
Upload OpenAPI + stainless.yml
Sourced reads both, recovers package names, and inventories the resources, auth, and publish settings you already have.
- 02
Get the compatibility report
Sourced diffs Sourced-generated TypeScript and Python against your live Stainless SDK — zero missing methods, plus a list of shapes to review.
- 03
Preview docs and SDK output
Hosted preview of the new docs site (with llms.txt) and a downloadable SDK preview, before any DNS or package change.
- 04
Publish on your timeline
When the report is clean, Sourced prepares repo-sync, registry readiness, and docs cutover checks; external writes stay behind explicit approval.
→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/