Convex

Convex is a reactive backend platform that bundles the database, server functions, workflows, realtime sync, text search, and file storage into one TypeScript codebase, explicitly designed around the reality that a coding agent is now writing much of the code. Its pitch, "all gas, no breakages," targets the failure mode where an agent ships something that compiles but silently corrupts data or breaks a client.

The guardrails are structural rather than advisory. Every mutation runs as an ACID transaction, so concurrent writes can't interleave into a corrupt state no matter how an agent orders them. Types flow end to end from schema to server function to React client, so a mismatch surfaces at build time instead of in production. Queries are reactive and cached automatically, meaning an agent doesn't have to hand-roll invalidation, websockets, or a caching layer, the three places where generated backend code usually goes wrong. First-party plugins install directly into Claude Code and Codex, and a library of sandboxed open-source components covers agent workflows, crons, and rate limiting.

The backend is open source under FSL-1.1-Apache-2.0 and self-hostable via Docker or prebuilt binaries, with the dashboard and CLI included. The hosted platform runs a free Starter tier with pay-as-you-go usage, Professional at $25 per developer per month, and Business/Enterprise from a $2,500 monthly minimum adding SOC 2 Type II, HIPAA, RBAC, and SSO. Convex was founded by former Dropbox infrastructure leads Jamie Turner and James Cowling, and is used by OpenAI, Tripadvisor, Solana, and Zapier.