Convex

Reactive TypeScript backend platform

Free tier + paidDatabases & backendconvex.dev

What it is

A reactive backend where the database, server functions and scheduler are one TypeScript system. Queries are automatically reactive, so subscribed clients update without websocket plumbing. The free plan allows 0.5GB database storage, 1GB file storage and 1,000,000 function calls per month; Professional is $25 per developer monthly.

Why it earns a slot

Everything is typed end to end, so agents get compile-time feedback instead of runtime surprises. Convex ships an official MCP server plus Chef, its own open-source AI app builder that actually understands the backend.

Know before you commit

Not Postgres — you write Convex queries, not SQL, so leaving means a real rewrite. The genuinely free limits (1M calls, 0.5GB) are far tighter than the headline numbers on the pricing page.

Getting started

npx convex dev, then add the Convex MCP server in your editor

Field notes

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Pricing snapshot

Free: 0.5GB DB, 1GB file storage, 1M function calls/mo, 1GB egress. Starter adds usage-based overages. Professional $25/developer/mo. Business from $2,500/mo.

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Convex (https://www.convex.dev) for this project, then use it only if it fits what we are already building.
Context: Reactive TypeScript backend platform. A reactive backend where the database, server functions and scheduler are one TypeScript system. Queries are automatically reactive, so subscribed clients update without websocket plumbing. The free plan allows 0.5GB database storage, 1GB file storage and 1,000,000 function calls per month; Professional is $25 per developer monthly.
Reviewer notes (general, not written for this codebase): Everything is typed end to end, so agents get compile-time feedback instead of runtime surprises. Convex ships an official MCP server plus Chef, its own open-source AI app builder that actually understands the backend.
Watch out for: Not Postgres — you write Convex queries, not SQL, so leaving means a real rewrite. The genuinely free limits (1M calls, 0.5GB) are far tighter than the headline numbers on the pricing page.
Pricing: Free: 0.5GB DB, 1GB file storage, 1M function calls/mo, 1GB egress. Starter adds usage-based overages. Professional $25/developer/mo. Business from $2,500/mo.
Setup: npx convex dev, then add the Convex MCP server in your editor
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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Neighbourhood

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Instead of thisDrizzle ORM PocketBase Appwrite Cloudflare D1 Firebase Instant DB Lovable Cloud

Named in the wiringTypeScript Better-T-Stack a0.dev

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