Convex Has a Free Reactive Backend — Real-Time Data Without WebSockets Code

Real-Time Is Hard. Convex Makes It Easy. Building real-time features means WebSockets, event handling, reconnection logic, and state sync. A chat feature takes days to build properly. Convex: Backend That Updates in Real-Time Convex is a reactive backend where queries automatically re-run when data changes. No WebSocket code. No polling. Free Tier Generous free usage for hobby projects Automatic real-time sync Built-in auth , file storage, scheduled functions ACID transactions on every mutation How It Works Define your backend: // convex/messages.ts import { query , mutation } from " ./_generated/server " import { v } from " convex/values " export const list = query ({ handler : async ( ctx ) => { return ctx . db . query ( " messages " ). order ( " desc " ). take ( 50 ) } }) export const send = mutation ({ args : { body : v . string (), author : v . string () }, handler : async ( ctx , { body , author }) => { await ctx . db . insert ( " messages " , { body , author }) } }) Use in React