Convex

Full-stack TypeScript platform: your reactive database and backend, always in sync.

Convex is the full-stack development platform that eliminates backend complexity. It replaces traditional stacks (database, servers, WebSockets) with three core building blocks: Mutations (atomic writes), Queries (live, reactive subscriptions), and Actions (serverless functions for third-party APIs like OpenAI). You define your entire backend, from database schemas to authentication, in pure TypeScript. This 'everything-is-code' approach ensures end-to-end type safety and guarantees real-time synchronization: when data changes in the backend, your frontend updates automatically, simplifying state management significantly.

https://www.convex.dev/