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Snaplet Seed vs Neosync

Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.

Snaplet SeedTest Data & Mocks
NeosyncTest Data & Mocks

Entry price

Free and open source

Open source

Free and open source

Open source

What drives the bill

The metric that actually scales your invoice.

Free and MIT-licensed. Snaplet the company shut down in August 2024 and snaplet.dev no longer resolves; this is a community-held library, not a service.

The MIT-licensed code remains free to self-host. The paid cloud service no longer exists — neosync.dev is offline.

Free tier

Everything, self-hosted

Everything, self-hosted

Open source

MIT

MIT

Self-hostable

No-code authoring

Languages

TypeScriptJavaScript
GoTypeScriptCodeless

Platforms

API
API

Fits teams

Solo / side projectStartupScale-up / mid-market
StartupScale-up / mid-market

Adoption

Emerging

Supabase community (formerly Snaplet) · since 2021

Emerging

Nucleus Cloud (acquired by Grow Therapy) · since 2023

Strengths

  • 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.
  • Open source and self-hostable, so sensitive data never leaves your infrastructure.
  • Preserves referential integrity across tables.
  • The last release is feature-complete for common Postgres and MySQL anonymisation work.

Limitations

  • Effectively unmaintained: the last npm release (0.98.0) was July 2024 and the last commit to the default branch was August 2024, though the repo is not archived.
  • PostgreSQL-centric.
  • TypeScript ecosystem only.
  • Archived and unmaintained since August 2025 — no security patches, no new connectors, no support.
  • The hosted cloud has been shut down, so self-hosting is the only option.
  • Fewer database connectors than the incumbents.

Best for

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

Realistically, nobody starting fresh. Existing self-hosted users can keep running it, but plan a migration to Tonic or a maintained alternative.

Full review
Full review

All of these integrate with: PostgreSQL, GitHub Actions.

Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.