Supabase: The Complete Getting Started Guide for AI Builders (2026)

Supabase is an open-source Firebase alternative built on PostgreSQL. It gives you a database, authentication, file storage, realtime subscriptions, and edge functions -- all from one dashboard. For AI builders, it's the fastest way to add a backend to your projects.

Why Supabase for AI projects

• PostgreSQL -- a real database, not a toy. Supports JSON, full-text search, and pgVector for AI embeddings.
• Built-in auth -- sign up, login, OAuth, magic links. No building auth from scratch.
• Row Level Security (RLS) -- database-level access control. Users only see their own data.
• Realtime -- live updates when data changes. No polling.
• Claude Code knows it -- Supabase is deeply integrated into Claude Code's knowledge. Ask it to "set up Supabase auth" and it does it correctly.

Setting up Supabase

Step 1: Create a project

Go to supabase.com and create an account. Click "New Project." Choose a name, password, and region. Your database is ready in about a minute.

Step 2: Get your keys

In your project settings, you'll find:

• Project URL -- where your Supabase instance lives
• Anon key -- public key for client-side queries (safe to expose)
• Service role key -- secret key for server-side operations (never expose)

Step 3: Install the client

``bash npm install @supabase/supabase-js `

Step 4: Initialize

`typescript import { createClient } from "@supabase/supabase-js";

const supabase = createClient( process.env.NEXT_PUBLIC_SUPABASE_URL!, process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY! ); `

Core features

Database

Supabase gives you a full PostgreSQL database with a visual table editor. Create tables, add columns, insert data -- all from the dashboard. Or write SQL directly.

Authentication

Built-in user management. Email/password, magic links, OAuth (Google, GitHub, etc.). Use with the @supabase/ssr` package for server-side auth in Next.js.

Row Level Security

RLS policies control who can see and modify data at the database level. Example: "Users can only read rows where user_id matches their auth ID." This is security built into the database, not just the application layer.

Storage

Store and serve files (images, PDFs, videos) with access control. Public buckets for assets, private buckets for user files.

Realtime

Subscribe to database changes. When a row is inserted, updated, or deleted, connected clients get the update instantly. Great for chat, notifications, and live dashboards.

Supabase + Claude Code

Claude Code knows Supabase deeply. You can say:

• "Set up Supabase auth with email/password and Google OAuth"
• "Create a todos table with RLS policies so users only see their own todos"
• "Add a file upload feature using Supabase Storage"
• "Set up realtime subscriptions for a chat feature"

Claude Code will write the migrations, create the RLS policies, implement the client-side code, and set up the environment variables.

When to use Supabase

|------|-----------|-------------|

Need	Supabase?	Alternative
User auth	Yes	Clerk, Auth0
PostgreSQL database	Yes	Neon, PlanetScale
File storage	Yes (private)	R2, S3 (public)
Realtime updates	Yes	Pusher, Ably
Edge functions	Yes	Vercel Functions
Vector search (AI)	Yes (pgVector)	Pinecone

Supabase is the best choice when you want multiple features from one platform. If you need specialized performance in one area, you might use a dedicated service.

Supabase at //PROMETHEUS

Supabase is our default backend for client projects. PostgreSQL + auth + RLS + realtime covers 90% of what business applications need. When we build for clients, we set up Supabase with proper RLS policies, migrations, and edge functions -- production-ready from day one.