Mockoon vs Neosync

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

From $20 per user/month (indicative, cloud)

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

Self-hosting is free; the cloud service is priced per user and record volume.

The desktop app and CLI are free and open source.

Open-source self-hosted edition is free.

Widely used

Mockoon · since 2017

Emerging

Nucleus Cloud · since 2023

• 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.

• Open source and self-hostable, so sensitive data never leaves your infrastructure.
• Preserves referential integrity across tables.
• Far cheaper than the commercial data-privacy platforms.

• 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.

• Young project with a small community.
• Fewer database connectors than the incumbents.
• Self-hosting is operational work.

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

Teams that need anonymised test data but cannot justify enterprise pricing.