Convex Review 2026: Is the Reactive Backend Worth It?
Convex is a backend platform where every query is reactive by default. Change the data, and every client subscribed to that data updates instantly. No WebSocket management, no polling, no cache invalidation. After building two production apps with Convex, here's my honest take.
What Convex Is
Convex is a serverless backend platform that combines:
- Reactive database — queries automatically re-run when data changes
- Server functions — queries, mutations, and actions run on Convex's infrastructure
- File storage — built-in file hosting
- Scheduling — cron jobs and delayed function execution
- Auth integration — works with Clerk, Auth0, and custom auth
The key innovation: your frontend subscribes to query results, and Convex handles making those queries reactive. When underlying data changes, affected queries re-compute and push updates to clients.
What I Like
Reactivity That Just Works
This is Convex's killer feature. In React:
const messages = useQuery(api.messages.list, { channelId })
That's it. messages updates automatically when anyone sends a message to that channel. No subscription management, no WebSocket setup, no invalidation logic. It genuinely feels magical the first time you see it work.
End-to-End TypeScript
Define your schema in TypeScript. Your queries and mutations are TypeScript functions. The client hooks are fully typed based on your function signatures. If it compiles, the types match across client and server. This eliminates an entire class of bugs.
ACID Transactions
Mutations are fully transactional. Read and write multiple documents atomically. This is surprisingly rare in serverless backend platforms.
Developer Experience
npx convex devstarts a dev server that syncs functions instantly- Dashboard shows real-time data, function logs, and query performance
- Error messages are clear and actionable
- Docs are excellent with real examples
Scheduling Built In
Need a cron job? crons.interval("cleanup", { minutes: 5 }, internal.cleanup.run). Need to run something in 24 hours? ctx.scheduler.runAfter(86400000, internal.reminders.send, { userId }). No external service needed.
What I Don't Like
Vendor Lock-In
Convex is cloud-only. No self-hosting option. Your data model, queries, and mutations are all Convex-specific. Migrating away means rewriting your entire backend.
Query Limitations
Convex queries must be deterministic (no random, no Date.now). This makes sense for reactivity but requires workarounds. You can't do arbitrary SQL — queries use Convex's index-based API.
No SQL
If you're used to SELECT * FROM orders JOIN users ON ..., you'll miss SQL. Convex queries are programmatic — you load documents by ID or index, then combine in code. Powerful but different.
Pricing at Scale
Free tier is generous (no limits on database rows, 1M function calls/mo). But at scale, function call pricing can add up. Real-time means more function re-executions than a traditional request-response model.
Smaller Ecosystem
Fewer tutorials, fewer community packages, fewer Stack Overflow answers than Firebase or Supabase. The Discord is active and the team is responsive, but you'll sometimes be on your own.
Pricing
| Tier | Price | Includes |
|---|---|---|
| Free | $0 | 1M function calls, 1GB storage, 1GB bandwidth |
| Pro | $25/mo | 25M function calls, 50GB storage, 50GB bandwidth |
| Enterprise | Custom | Dedicated support, SLA, custom limits |
Overages on Pro are reasonable. For most small-to-medium apps, the Pro tier is sufficient.
Best Use Cases
- Collaborative apps — docs, whiteboards, project management
- Chat and messaging — real-time is the core requirement
- Dashboards — data updates instantly without refresh
- Multiplayer features — presence, cursors, live updates
- Internal tools — fast to build, real-time updates keep data fresh
Worst Use Cases
- Heavy analytics/reporting — no SQL, limited aggregations
- Existing apps with complex SQL — migration is painful
- Apps that need self-hosting — not available
- Simple CRUD with no real-time needs — overkill
Convex vs Alternatives
| Convex | Supabase | Firebase | |
|---|---|---|---|
| Reactive queries | ✅ Native | ❌ Change events | ❌ Listeners |
| SQL | ❌ | ✅ Full Postgres | ❌ |
| Self-hosting | ❌ | ✅ | ❌ |
| TypeScript DX | Best | Good | Okay |
| Real-time DX | Best | Okay | Good |
| Ecosystem size | Small | Medium | Large |
FAQ
Is Convex production-ready?
Yes. GA since 2023, used by production apps with real users. The team includes ex-Dropbox engineers.
Can I use Convex with Next.js?
Yes. Works with App Router and Pages Router. SSR support for initial data loading with preloaded queries.
What if Convex shuts down?
Valid concern with any hosted-only platform. Convex is VC-funded with a growing customer base. You can export data, but function logic would need rewriting.
How does Convex compare to tRPC + Drizzle?
Different category. tRPC + Drizzle gives you type-safe APIs with SQL. Convex gives you reactive queries without managing infrastructure. If you need reactivity, Convex wins. If you need SQL power, tRPC + Drizzle wins.
Bottom Line
Convex is the best developer experience for building real-time apps in 2026. The reactive query model is genuinely innovative — once you build with it, traditional request-response feels primitive. The tradeoffs are real (no SQL, no self-hosting, vendor lock-in), but for the right use case, nothing else comes close.
Recommendation: Try Convex for your next real-time project. The free tier is generous enough to build a full MVP. If your app doesn't need real-time features, Supabase is probably a better fit.