Engineeredto the Core
A curated collection of high-performance & beautifully engineered blocks.
Why Marrow
Engineered, not assembled
Ship in Hours
Drop a `.ts` file into your project. Every block is a self-contained server action — no wiring, no boilerplate.
Security First
bcrypt hashing, token expiry, account lockout, RBAC guards — hardened defaults baked in at every layer.
Type-Safe to the Core
Strict TypeScript throughout. Zod-validated inputs, typed DB adapters, and exhaustive union types.
ORM Agnostic
Bring your own database adapter. Works with Prisma, Drizzle, Supabase, or any repository pattern.
Available Now
17 open-source blocks
Free · MIT · Sign in to copy
Curated Collections
Start with a bundle
Free, curated sets of blocks that work well together. Pick one and ship faster.
SaaS Starter Bundle
Four production-ready blocks covering authentication, billing, transactional email, and multi-tenant workspaces — everything to launch a SaaS in a weekend.
View bundle on GitHub →Platform Infrastructure Bundle
Four blocks covering analytics tracking, real-time notifications, rate limiting, and full-text search — the infrastructure layer for a growing product.
View bundle on GitHub →What's next
On the roadmap
These are real things in development — not vaporware. Sign up to be notified when they ship.