Convex Has a Free Reactive Backend That Syncs Data to Your Frontend in Real-Time

Convex is a reactive backend-as-a-service. Define your backend in TypeScript — it auto-syncs to your frontend in real-time.

Free Tier

• Unlimited API calls (within reason)
• 512MB database
• 1GB file storage
• Scheduled functions — cron jobs
• Full-text search — built-in
• Real-time — automatic sync

Define Backend

// convex/messages.ts
import { query, mutation } from './_generated/server';
import { v } from 'convex/values';

export const list = query(async ({ db }) => {
  return await db.query('messages').order('desc').take(50);
});

export const send = mutation({
  args: { body: v.string(), author: v.string() },
  handler: async ({ db }, { body, author }) => {
    await db.insert('messages', { body, author });
  },
});

Frontend (React)

const messages = useQuery(api.messages.list);
// Auto-updates when data changes!

Convex vs Firebase

Feature	Convex	Firebase
Backend logic	TypeScript functions	Cloud Functions
Type safety	Full	Manual
Real-time	Automatic	onSnapshot
Database	Relational-ish	NoSQL

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Need reactive backend? GitHub or [e-mail]