Convex is a reactive TypeScript backend that collapses database, API, and realtime sync into one workspace, write your schema and queries in TS, and the client subscribes to them. The wedge is end-to-end type safety plus reactivity by default, which makes it especially strong for chat, dashboards, and AI agent apps where state changes constantly. The trade is non-trivial lock-in: queries are Convex functions, not SQL, and migrating out means rewriting your data layer. For TS-native teams shipping reactive apps, Convex is uniquely shaped.
- Reactive by default, queries auto-rerun in the client when data changes
- End-to-end type safety from schema to client without codegen plumbing
- Built-in vector search, file storage, auth, cron, durable workflows
- Convex Components, reusable backend modules (chat, AI, streaming)
- Open-source self-hosted option (Apache 2.0) alongside managed cloud
- Lock-in is real, queries are TS functions, not SQL
- $25/dev/mo Pro pricing scales with team size
- Smaller ecosystem than Postgres / MongoDB
- Not the right fit for analytics workloads or complex aggregations
- Newer category, fewer war-stories at scale, evolving best practices
Convex is a backend platform built around reactive TypeScript functions. Schema, queries, mutations, and actions all live in your codebase as typed TS functions; the client subscribes to queries and re-renders automatically when underlying data changes. Convex Components extend the base into prebuilt modules for chat, AI agents, file streaming, and durable workflows.
Where it fits
Convex is the right pick for reactive apps where the UI needs to update live as data changes, chat, collaborative editors, live dashboards, AI agent UIs, multiplayer experiences. The wedge is that reactivity isn’t a layer you add on top of a database (with Pusher or Ably or Postgres LISTEN); it’s the default behavior of the data layer itself.
For AI agent apps specifically, Convex’s durable workflow primitives, vector search, and Components ecosystem (“Chef” AI app builder, agent memory, streaming chat) make it a natural fit. For cross-platform teams using React Native / Expo plus a Next.js web app, Convex provides one backend across both.
Avoid Convex when your data model is analytical, when you need SQL semantics, or when ecosystem maturity (drivers, ORMs, hiring pool) is a load-bearing constraint, Postgres remains the safer choice for those cases.
Pricing in practice
Free / Starter is pay-as-you-go with 1M function calls/month, 0.5 GB database storage, and 1 GB file storage, enough for a side project or early prototype. Professional is $25/developer/ month with 25M function calls, 50 GB storage, 100 GB file storage, log streaming, daily backups, and custom domains. Business / Enterprise starts at $2,500/month minimum with SAML / SSO, SLAs, dedicated deployments, and custom MSA.
The per-developer pricing is the lever to watch: a 5-person team starts at $125/month before usage. The open-source self- hosted option (Apache 2.0) is the escape hatch, production- viable but trades the managed surface for ops work.
How it compares
Supabase, Real Postgres with auth, storage, realtime, and edge functions. Pick when you want SQL semantics and a complete platform with no lock-in to the data layer.
Neon, Serverless Postgres with branching and scale-to-zero. Pick when you want raw Postgres rather than a TypeScript-native backend.
MongoDB, Document database with flexible schemas and Atlas Vector Search. Pick when you want documents with a mature ecosystem and don’t need reactivity built in.
What changed recently
Convex shipped major Components for chat streaming, agent workflows, and durable function execution through 2026, plus the “Chef” AI app builder for end-to-end Convex-app generation. GPU integration patterns for RunPod and similar serverless GPU providers landed early 2026, positioning Convex for the AI-agent backend market. The self-hosted backend has continued to mature under Apache 2.0, providing a credible exit path for teams worried about cloud lock-in.
Sources
- Convex Pricing, convex.dev
- Convex Stack (Blog), stack.convex.dev, 2026
- Convex Components, convex.dev
- Convex Backend (open source), github.com