Make and send apps like pictures.

Describe an app and Krate makes it. Send it as a link and it opens in any browser, phones included, with nothing to install. On Mac, Windows and Linux it runs natively.

Try Krate now Download the app

Open-source runtime. The same .krate file runs on macOS, Windows and Linux: 10 apps pass on all three in CI at Krate 0.5.4.

Editor.krate, a code editor, open on a Mac

9:41

SSam

made a code editor, try it

Editor.krate294 KB · Krate app

opening it on my phone

Tap to open

Mon9:41

Editor

Editor can

Open a window

Your files

Use the network

Not nowOpen

9:41

Editor

Search files

lib.rssrc · 1 unsaved change

window.rssrc/ui · the window and its tabs

Cargo.tomlthe build setup

README.mdwhat the editor does

Editor.krate · 294 KB · same file as desktop

Editor.krateKrate app · 294 KB

src/lib.rs · line 41

impl Card

/// Advance one frame.
pub fn tick(&mut self, dt: f32) {
    let dt = dt.min(0.05);
    self.level.tick(dt);
    self.frames += 1;
}

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               ..oooooooooooo..
           ..oooooooooooooooooooo..
       .iioiiooooooooooooooooooooooooo.
  ..ioiiiioooooooooooooooooooooooooooooooo..
  ...........................................
ioooooooaooooooooooooaaaaaaaaaaaaaaaaaaoooaaaa
oooooooooooooooooooooooooooooooooooooooaaa####
oooaaaaaooooooooaaaooooaaooaooooooaaa#########
..aaaaaaaaaaaoooooooaaaaoooooaaa###########...
ooa....aaaaaaaaaaooooooooaaa###########....##a
oooooaa....aaaaaaaaaaaoa###########....#######
...aaaaaaaaa....aaaaaaa#######.....########...
ooaa...aaaaaaaaa....aaaa##.....########....###
ooaaaaaa...aaaaaaaaa.......########....#######
.aaaaaaaaaaa...aaaaaaaoa#######....#########..
    .aaaaaaaaaaa...aaaaa###....#########..
        ..aaaaaaaaaa.......#########..
            ..aaaaaaaaaa########..
                ..aaaaaa####..
                    ..a#..

Editor canbefore it opens

Open a window

Your files

Use the network

# krate.toml [app] name = "Editor" version = "0.1.0" size = "294 KB" [capabilities] window = true clock = true files = false network = false [targets] macos = true windows = true linux = true

Samnowmade a code editor, try itEditor.krate · 294 KB

Phones and tabletsComing soon, from the same one file

AI makes an app in minutes.
Getting it to people still takes weeks.

Shipping used to mean developer licences, a build and a signature for every OS, a different download for each, and an .exe that gets your whole PC when someone double-clicks it. Hosting a web app instead never feels native. Krate replaces all of that with one file.

A link opens it in anyone's browser, on a phone or a computer, with nothing to install and no account. With the Krate runtime installed, it runs natively, with no browser or WebView inside, and every Krate app after that is just a file.

How it travels

Send an app like a picture. It opens on whatever they have.

Send it

Share a link, drop it in a chat, attach it to an email. One file, from 37 KB, goes wherever pictures go.

CopyCopied

Opening an app - KrateA Krate app, open in this tab. Nothing to install.hub.krate.tech

Anyone with the link can open it

SSam

is the editor ready?

yes, try it

Editor.krate294 KB

DeliveredRead 9:41

it just opened. on my phone too

ToMMaya Chen

SubjectThe code editor, ready to try

Hi Maya, here it is. Tap the link and it opens in your browser.

Editor.krate294 KBSend

Sent to Maya

Open it anywhere

The same file opens natively on macOS, Windows and Linux, and from a link in any browser, phones included.

Editor.krate · 294 KB

One file, opening on every screen

macOSnative window

Windowsnative window

Linuxnative window

iPhonein the browser

Androidin the browser

Same file on all five. No build per system.

Trust it

A Krate app starts with no access to your files or the network. Before it opens, you see what it asks for, and you decide.

“Editor” wants to:

show its window

save its own settings and data

your filesnot asked

the networknot asked

CancelAllow and open

Editoropen

its window

its own data

your files

the network

It gets nothing else. Ask for more, and you are asked first.

One .krate file, every screen

macOS Windows Linux iPhone Android Any browser

Why Krate

Small by design. Quick because of it.

1file

For every screen

Any browser opens the same .krate from a link, and macOS, Windows and Linux run it natively. No build per system.

37KB

For a whole app

The Notes app, start to finish. On a computer, the Krate runtime is installed once and shared by every app; in a browser there is nothing to install.

13× less

Memory

Notes holding 50,000 lines, against an Electron editor doing the same work.

Krate178.5 MiB

Electron editor2,299.4 MiB

2.6× faster

To open

A warm open of the same 50,000 lines, median of ten runs.

Krate237.1 ms

Electron editor611.5 ms

Measured on 25 August 2026 on an Apple M4: Krate against MarkText 0.17.1 (Electron), both ARM64, on the same 50,000-line notes workload. An equivalent workload, not full feature parity. Read the method

Use Krate for the tools you need, and the ones you dream up.

Notes

Quick capture, a sidebar, search. Saved on your computer, never on someone else's.

Notes

Ship the demo

Groceries

Ideas

Ship the demo
Record the run-through, tighten the intro, send the link before Friday.

Utilities

A hex viewer, a JWT decoder, a cron explainer. Small tools that do one thing, offline.

00000000 89 50 4e 47 0d 0a 1a 0a .PNG.... 00000010 00 00 00 0d 49 48 44 52 ....IHDR 00000020 00 00 04 b0 00 00 02 f8 ........ 00000030 08 06 00 00 00 a3 7c 3e ......|> 00000040 6f 00 00 00 01 73 52 47 o....sRG 00000050 42 00 ae ce 1c e9 00 00 B.......

Dashboards

Read a CSV, chart it, keep it current. Your numbers stay on your machine.

Spending, March

Games

Little games you can send a friend as a link, and they just play.

Ported apps

Bring an Electron app over and watch it go from hundreds of megabytes to one small file.

Maps cleanly38

Needs your say2

Left out1

Build Notes.krate

Teaching tools

Flashcards, quizzes, a periodic table. Send the class one link that opens on every school computer and every phone.

CARD 4 OF 20

la manzana

Tap to flip

Shipping a desktop app

How to distribute a desktop appOne file instead of a build, a signature and a download for each OS. Krate vs ElectronNo browser inside every app, and no package per system. Electron alternativesTauri, Wails, Neutralinojs, Flutter, Qt and Krate, by what you ship. Krate vs TauriNo WebView and no per-OS bundles: one file for every desktop. Desktop app or hosted web appA real app that works offline and needs no server. Code signingWhat a native installer needs, and what a .krate file needs instead. Shipping FAQStraight answers to what people ask once the app is built. Krate, the factsWhat Krate is and is not, the release, platforms and licences.

All answers about shipping desktop apps

Why sharing a desktop app is still hard ↗Porting an app you already have (beta) ↗How to run AI-written code without reading it ↗

*A link opens a Krate app in the browser with nothing to install. To run it natively, install the Krate app once on macOS, Windows or Linux.

Try Krate today

Download Studio