Convex Has a Free API — The Reactive Backend That Syncs Automatically

Convex is a reactive backend where queries automatically update when data changes. No polling, no WebSocket setup, no cache invalidation — just write a query and it stays in sync. Why Convex? Reactive queries — UI updates instantly when data changes TypeScript end-to-end — schema, queries, mutations — all typed No infrastructure — managed database, file storage, scheduled jobs Free tier — generous for hobby projects Quick Start npm create convex@latest npx convex dev # Starts dev server + syncs schema Schema // convex/schema.ts import { defineSchema , defineTable } from ' convex/server ' ; import { v } from ' convex/values ' ; export default defineSchema ({ users : defineTable ({ name : v . string (), email : v . string (), avatar : v . optional ( v . string ()), }). index ( ' by_email ' , [ ' email ' ]), messages : defineTable ({ text : v . string (), author : v . id ( ' users ' ), channel : v . string (), }). index ( ' by_channel ' , [ ' channel ' ]), }); Queries (Reactive!) // conve