App Builder

What it does

Creates fully interactive web applications from natural language descriptions. Dashboards, calculators, trackers, games, tools, landing pages, and anything else you can describe.

Setup required

None. Works immediately.

Permissions

No macOS permissions needed (apps run in the sandbox)
Host permissions needed only if the app needs to read/write files on your machine

Common prompts

You say...	What happens
“Build me a habit tracker”	Creates an interactive app with daily tracking and streaks
“Make a pomodoro timer”	Builds a countdown timer with work/break intervals
“Create a budget dashboard”	Builds an app with categories, charts, and totals
“Build a quiz about world capitals”	Creates an interactive quiz game
“Make a portfolio site for my photography”	Builds a presentational website
“Create a mood tracker with a calendar view”	Builds a visual tracker with date-based input
“Build me a kanban board”	Creates a drag-and-drop task board

What it builds

Apps are built with HTML, CSS, and JavaScript. They:

Open in their own panel in the desktop app
Are fully interactive (buttons, inputs, animations, state)
Persist so you can come back to them
Follow a design system with consistent styling
Can be iterated on after creation

Iterating on apps

First version not quite right? Just say so:

“Add a dark mode toggle.”

“Make the charts bigger.”

“Change the color scheme to blues and purples.”

“Add an export-to-CSV button.”

Your assistant makes targeted edits to the existing app. No need to start over.

App types

Type	What it's for	Examples
App (default)	Interactive tools with state and logic	Calculators, dashboards, trackers, games
Site	Presentational pages without complex state	Portfolios, landing pages, resumes

Configuration

No configuration needed
Apps use the Vellum design system by default (semantic colors, spacing, components)
You can specify aesthetics: “make it minimal,” “go bold and colorful,” “dark mode”

Tips & gotchas

Be descriptive, not technical. Say “build me a budget tracker with categories” not “create an HTML page with a JavaScript array and DOM manipulation.” Let your assistant handle the implementation.
Go big. Your assistant can build surprisingly complex apps. Multi-page forms, real-time dashboards, animated games. Don't limit yourself.
Quality standards: Apps include hover states, animations, proper typography, and responsive layouts by default. If something looks off, just ask for a fix.
Not for long-form writing. If you want to write a blog post or article, use the document editor instead. App Builder is for interactive things.
Home Base is a special app that serves as your dashboard. You can customize it: “Add a button to my dashboard for checking email.”