Build and ship with Dubleu

Dubleu runs entirely in the browser — no local setup, no npm install, no config files. Open a project and start building in seconds.

1. 1

   Open Dubleu and create a project

   Go to apps.dubleu.app, sign in, and click New Project. Give it a name and choose a starter or start blank.
2. 2

   Describe what you want to build

   Type your idea in the chat panel on the left. Be as specific or as vague as you like — Dubleu will ask clarifying questions if it needs them.
3. 3

   Enable Agent Mode for complex tasks

   Click the ⚡ lightning bolt in the chat header to enable Agent Mode. Dubleu will write a plan and work through it autonomously — writing files, running migrations, and fixing errors.
4. 4

   Deploy with one click

   Hit Deploy in the top bar. Dubleu detects your stack automatically (Next.js → Vercel, static → Netlify, Expo → EAS) and ships it. A live URL is ready in seconds.

Agent Mode lets Dubleu plan and execute multi-step tasks autonomously. It writes a structured task plan, works through each step, and signals when it's done — or when it needs your input.

Enabling Agent Mode

Click the ⚡ lightning bolticon in the chat header. The send button turns into a bolt icon to confirm it's active. Send your task description and the agent will begin immediately.

How the agent tracks progress

Every agent session writes to .tasks/ files in your project:

Dubleu can provision a full Postgres database via Supabase, run SQL migrations, enable row-level security, and inject credentials as Vercel env vars — all from the chat.

Provisioning a database

Simply ask in chat:

"Add a Postgres database to this project"

Dubleu provisions the Supabase project and makes these env vars available automatically:

Example: Supabase client setup

import { createClient } from '@supabase/supabase-js'

// Client-side (browser-safe)
const supabase = createClient(
  process.env.NEXT_PUBLIC_DUBLEU_DB_URL!,
  process.env.NEXT_PUBLIC_DUBLEU_DB_ANON_KEY!
)

// Server-side only
const supabaseAdmin = createClient(
  process.env.DUBLEU_DB_URL!,
  process.env.DUBLEU_DB_SERVICE_KEY!
)

Click Deploy in the top bar. Dubleu detects your stack and ships to the right target automatically. No config required.

Custom domains

After your first deploy, tell Dubleu your domain name in chat:

"Add my custom domain myapp.com to this project"

Dubleu configures the Vercel project and provides the DNS records to add at your registrar. Once DNS propagates (usually under 5 minutes), your domain is live.

Dubleu never stores secrets in plain text, logs, or chat. API keys are collected via masked input fields, encrypted in our vault, and pushed directly to Vercel environment variables.

Adding a secret

When you need to add an API key, ask in chat:

"Add my Stripe secret key to this project"

Dubleu renders a masked input field. Enter your key — it is encrypted immediately and never shown in the chat or visible to the AI. Reference it in your code as:

process.env.STRIPE_SECRET_KEY

Model Context Protocol (MCP) lets Dubleu talk directly to external services — GitHub, Linear, Stripe, Slack, and 20+ more. Connect once, use from chat forever.

Well-known servers

Skills are built-in instruction sets that activate specialised behaviour. Type a skill name in chat or use the quick-action buttons below the chat input.