/build — Generate Apps, Sites & Code

From prompt to live site in seconds The /build command is Krater's unified builder. Describe what you want and get production ready code, a live preview in Studio, or a published site at .krater.si...

From prompt to live site in seconds

The /build command is Krater’s unified builder. Describe what you want and get production-ready code, a live preview in Studio, or a published site at *.krater.site, all from a single prompt.

/build replaces the older /code and /visual commands, and it accepts file uploads: attach a screenshot to recreate a design, or drop in an existing code file to extend it.

Cost: the command menu shows a 5 credit estimate. Actual billing uses your selected model’s real token usage, so a short snippet usually costs less and a large multi-file build costs more. Track each run under Settings → Usage.

How to use

/build A React hook that fetches data with loading and error states

The /build command for creating mini-apps and tools

/build A modern SaaS pricing page with monthly/yearly toggle

/build An interactive compound interest calculator

/build A landing page for my coffee shop, then publish it

Three outcomes, one command

Code

Generate snippets, components, hooks, scripts, or full files. Results stream in as copy-paste-ready code blocks with full syntax highlighting. Python, JavaScript, and TypeScript artifacts can run directly inside Studio, no local setup needed.

Live preview in Studio

Websites and apps open in Studio: a sandboxed live preview right next to your chat. Switch between desktop, tablet, and mobile viewports, inspect every file’s code, compare versions with diffs, edit files by hand, or roll back to an earlier version. To iterate, just ask in plain language, for example “make the hero full-width”, and /build ships a new version.

Publish to `*.krater.site`

Push the result to a real URL like your-project.krater.site with one click. Krater hosts it, and published sites carry a small “Built with Krater” badge. Your subdomain is permanent once claimed.

Manage every published site under Keep → Sites: traffic stats, version rollback, custom domains, unpublish, or delete.

Publishing requires an Ultra or Max plan:

Plan	Live sites	Custom domains
Ultra	2	2
Max	5	5

What you can build

UI & web

Pricing tables, navigation menus, hero sections
Forms, dashboards, admin panels
Landing pages, portfolios, marketing sites

Interactive tools

Calculators (mortgage, ROI, compound interest, tip splitter)
Charts and data visualizations
Quizzes, games, configurators

Code & components

React, Vue, and Svelte components
API integrations, hooks, utilities
Python scripts, Rust crates, Go modules
SQL queries, regex, shell scripts

Apps

Todo lists, note-takers, trackers
Mini CRMs and dashboards
Prototypes for client demos

Supported languages

TypeScript, JavaScript, Python, Rust, Go, Java, C++, C#, Swift, Ruby, PHP, SQL, Bash, HTML, CSS, and many more. Krater detects the right language from your prompt.

Why /build?

One command for code, sites, and apps, no mode to pick upfront
500+ AI models behind it, including the auto/power router for stronger code output
Live preview: see it before you ship it
One-click publish: prompt to public URL in under a minute
No setup: no IDE, no terminal, no deploy pipeline

Tips

Be specific about layout, colors, and features. “Pricing page, three tiers, dark mode toggle” beats “make a pricing page”.
Attach a reference screenshot or file when you want a close match to something existing.
Iterate in chat instead of rewriting your prompt. Every change creates a new version you can roll back from.

More in Slash Commands

See Krater pricing or contact support.