sdk-gen — Stainless replacement, free

1. OpenAPI spec

Paste URL<br>Paste JSON<br>Use Petstore sample

JSON or YAML, OpenAPI 3.0+.

2. Target languages

TypeScript

Python

Go

Generate SDK pack

Why this exists

Anthropic acquired Stainless and shut it down. OpenAI, Google, and hundreds of small startups had their SDKs generated by Stainless. They have until September to find a replacement. This is the simplest possible alternative — paste your spec, get a ZIP. No account. Built in 24 hours.

For more demanding setups (watched-repo mode, MCP server output, custom branding), email ian.y.mu@gmail.com — first 5 customers get a hand-tuned pack free.

Pricing (Coming soon — v1 is free)

Free

$0

• Paste spec → download ZIP

• TS, Python, Go

• Public spec only

Pack

$30 one-time

• 5-language SDK pack

• Private spec handling

• 30-day email support

Watched repo

$30/mo

• GitHub spec watch

• Auto-PR on spec change

• Waitlist — email below

Notify me

v0.1 known limits (be honest)

Complex schema features (allOf composition, discriminated unions, recursive refs) fall back to dict / map[string]interface{}.

Python and Go are template-based — readable but less idiomatic than Stainless output. Refine the generated code as needed.

No auth helpers wired automatically. Read the spec's securitySchemes and pass headers via the client constructor.

Vercel serverless 60s timeout. Very large specs (>500 operations) may time out.

YAML specs: paste the URL, not raw YAML. JSON paste works directly.