Snaplet Seed vs Mockoon

Free and open source

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

The Seed library is open source and free; note that Snaplet wound down its hosted product, so treat this as a library rather than a service.

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

Everything, self-hosted

The desktop app and CLI are free and open source.

Emerging

Snaplet · since 2021

Widely used

Mockoon · since 2017

• Schema-aware generation means the data actually inserts and the app actually works.
• Deterministic seeds make failing tests reproducible.
• Good TypeScript ergonomics with Prisma and Drizzle.

• 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.

• The company wound down its hosted business — evaluate the library's maintenance status before depending on it.
• PostgreSQL-centric.
• TypeScript ecosystem only.

• 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.

TypeScript teams that want each developer and CI run to start from a clean, coherent database.

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