Platforms

Pick the platform, not the framework.

A platform is where your app runs. Start with one and add the rest later with a single command: they all share your code, your packages and the CLI. This page helps you choose.

What are you building?

A website or a web appWebStatic, single-page or server-rendered, and installable as a PWA.kitr add web site
An API, with or without ReactServerRoutes, controllers and live channels on Node, Bun, Deno or Workers.kitr add server api
iPhone and Android appsMobileYour React app in a native shell, with deep links and the back button handled.kitr add mobile phone
A desktop app that looks the same everywhereDesktopElectron ships its own Chromium, so every machine renders it identically.kitr add desktop app
A desktop app with a small downloadTauriA Rust binary on the system webview. Megabytes, not hundreds of them.kitr add tauri app

Side by side

What each platform runs on, what it needs on your machine and what a build gives you.

Platform	Runs on	You also install	Saved items live in	`kitr build` gives you
WebVite + TanStack Start	Static, SPA, SSR, PWA	Nothing else	localStorage	dist/site/client, plus dist/site/server/server.js in ssr mode
Serverh3	Node, Bun, Deno, Workers	Nothing else. Bun, Deno or Wrangler if you pick that runtime	Nowhere: items read their defaults. Use a database or cache	a bundled server in dist/api
DesktopElectron	Windows, macOS, Linux	Nothing else	kitr-storage.json in the app data folder	electron-vite builds main, preload and the app
TauriRust + system webview	Windows, macOS, Linux	The Rust toolchain	kitr.json, through the Tauri store plugin	tauri build: a native bundle per OS
MobileCapacitor	iOS, Android	Xcode for iOS, Android Studio for Android	Capacitor Preferences, kept when the OS clears the webview	the web build synced into ios/ and android/

Mix them in one project

Platforms are named entries in kitrrc.ts, so one project can hold several. These are the usual mixes.

A site with its own API

Pages and the API in one project and one set of types. The API mounts inside the site or runs as its own process.

kitr new my-app --kit fullstackBuild a full-stack app →

One app on every screen

The same routes and components build a web app, an iPhone and Android app and a desktop app.

kitr add mobile phonekitr add desktop appShip one app everywhere →

An API and nothing else

No React in the dependency graph: an h3 server with routes, a database, logs and tests.

kitr new my-api --kit serverBuild an API server without React →

Which packages run where

9 of 38 packages run on every platform. On desktop and phones, the marked ones switch to native APIs underneath with no change to your code.

All packages →

Built for this platform Built for or native on this platformWorks here Works hereNot here Not available

Package	Web	Server	Desktop	Tauri	Mobile
Data fetching
http	Works here	Not here	Works here	Works here	Works here
offline	Works here	Not here	Works here	Works here	Works here
query	Works here	Not here	Works here	Works here	Works here
App state
flags	Works here	Works here	Works here	Works here	Works here
state	Works here	Not here	Works here	Works here	Works here
Backend
actions	Works here	Not here	Not here	Not here	Not here
api	Works here	Built for this platform	Works here	Works here	Works here
cache	Not here	Built for this platform	Not here	Not here	Not here
db	Not here	Built for this platform	Not here	Not here	Not here
jobs	Not here	Built for this platform	Not here	Not here	Not here
mail	Not here	Built for this platform	Not here	Not here	Not here
shield	Not here	Built for this platform	Not here	Not here	Not here
uploads	Works here	Built for this platform	Works here	Works here	Works here
Real-time
realtime	Works here	Works here	Works here	Works here	Works here
Interface
3d	Works here	Not here	Works here	Works here	Works here
animation	Works here	Not here	Works here	Works here	Works here
i18n	Works here	Not here	Works here	Works here	Works here
table	Works here	Not here	Works here	Works here	Works here
tailwind	Works here	Not here	Works here	Works here	Works here
theme	Works here	Not here	Works here	Works here	Works here
toast	Works here	Not here	Works here	Works here	Works here
Forms
forms	Works here	Not here	Works here	Works here	Works here
Auth
auth	Works here	Works here	Works here	Works here	Works here
Pages & routing
router	Works here	Not here	Works here	Works here	Works here
seo	Built for this platform	Not here	Not here	Not here	Not here
Device features
files	Works here	Not here	Works here	Works here	Works here
native	Works here	Not here	Works here	Works here	Works here
notifications	Works here	Not here	Works here	Works here	Works here
platform	Works here	Not here	Built for this platform	Built for this platform	Built for this platform
secure-storage	Works here	Not here	Works here	Works here	Works here
storage	Works here	Works here	Built for this platform	Built for this platform	Built for this platform
Analytics & errors
analytics	Works here	Not here	Works here	Works here	Works here
consent	Works here	Not here	Works here	Works here	Works here
monitoring	Works here	Works here	Works here	Works here	Works here
Developer tools
devtools	Works here	Not here	Works here	Works here	Works here
logger	Works here	Works here	Works here	Works here	Works here
mocks	Works here	Not here	Works here	Works here	Works here
testing	Works here	Works here	Works here	Works here	Works here

Need something else, like a kiosk or a browser extension? A platform is a package with a definePlatform() factory, so you can write your own. Write a platform →