Convex Has a Free Reactive Database That Syncs in Real-Time — Like Firebase but With ACID Transactions

The Real-Time Database Problem Firebase: no joins, no transactions, no relational queries. Supabase: real-time is an add-on. Building real-time from scratch: WebSockets, cache invalidation, conflict resolution. Convex is a reactive database. Queries re-run automatically when data changes. Full ACID transactions. TypeScript end-to-end. What Convex Gives You Reactive Queries // convex/messages.ts import { query } from ' ./_generated/server ' ; export const list = query ({ handler : async ( ctx ) => { return await ctx . db . query ( ' messages ' ) . order ( ' desc ' ) . take ( 50 ); }, }); // React component — auto-updates when data changes import { useQuery } from ' convex/react ' ; import { api } from ' ../convex/_generated/api ' ; function MessageList () { const messages = useQuery ( api . messages . list ); return ( < ul > { messages ?. map ( m => < li key = { m . _id } > { m . text } </ li >) } </ ul > ); } No WebSocket setup. No polling. No cache invalidation. When someone adds a me