Reactive backend-as-a-service platform for real-time web applications review
Convex is a serverless relational database backend platform built for modern reactive web apps. By replacing complex ORMs and database syncing libraries with native reactive functions, Convex syncs state from the database directly to React components in real-time.
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Convex simplifies the application backend stack. It handles database storage, backend functions, caching, and state sync using a unified TypeScript engine. Instead of querying a database, building APIs, and writing client state syncs, you define Convex query/mutation functions that execute on their serverless cloud and sync updates instantly via WebSockets.
Sync database mutations directly to React hooks without writing custom polling or REST/WebSocket configurations.
Write database schemas and queries in native TypeScript with full autocompletion and compile checking.
Set up background tasks, schedules, and webhooks easily inside your project folder.
Store and retrieve files, images, and user avatars directly via the Convex storage API.
Pricing is indicative and may vary based on team size, contract length, and regional taxation.
| Plan Tier | Price | Core Features Included |
|---|---|---|
| Free Tier | Free | 1 million read/write ops per day, 1 GB database storage, 10 GB file storage, 1 user seat. |
| Pro Plan | $25/mo (~₹2,100/mo) | 10 million read/write ops, 5 GB database storage, 50 GB file storage, team seats, custom domain hooks. |
| Enterprise Plan | Custom Quote | Custom limits, dedicated server deployment, uptime SLAs, enterprise support. |
Convex is free for basic developer sandboxes. The Pro plan at $25/mo (~₹2,100) handles production usage. Subscriptions are billed in USD; standard 18% business GST applies via RCM.
Convex uses an ACID-compliant transactional database engine built specifically for TypeScript application backends. Its architecture centers around deterministic query and mutation functions executing in V8 isolates, maintaining reactive WebSocket connections to subscribe client UI components to live query result sets. Data mutation logs automatically stream updates across connected clients with sub-100ms latency without requiring external pub/sub infrastructure like Redis.
### Integration Playbook: Real-Time Active Users Hook Implement a Convex query function to retrieve a real-time list of active users, and link it directly to your React components without writing web sockets manually: ```typescript // convex/users.ts import { query } from "./_generated/server"; export const getActiveUsers = query({ args: {}, handler: async (ctx) => { return await ctx.db .query("users") .filter((q) => q.eq(q.field("isActive"), true)) .collect(); }, }); ``` Inside your React component, use `useQuery(api.users.getActiveUsers)` to receive real-time database updates automatically on any change.
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