Publish your appon CloudCrane

    Bring an app you already have, from Android, iPhone or the web. You try it on your phone first; it goes on Explore only when you say so.

    Sign in to publish
    Read the docs

    Three ways in

    • 1

      Your assistant ports it

      Any app: Android, iPhone, Flutter, React Native or a website. Open its code in Claude Code or Cursor with CloudCrane connected, and ask it to bring the app over. It writes the spec, checks it, and publishes it privately for you.

    • 2

      Run Blackbox

      Our free, open-source tool drafts the spec on your machine. It reads your code and never runs it, sends nothing to us, and none of your code ends up in the spec.

    • 3

      Upload a spec

      Already have a spec.json? Upload it, and we check it and show the app it makes before anything is kept.

    What comes with it

    Comes over

    • Its look: your colours, light and dark
    • Its screens, and what people do on them
    • Its rules, with their own test cases
    • What it saves, kept on the phone
    • The sites it talks to, listed for people to see
    • Camera, location and other phone features it uses

    Stays behind

    • Work in the background, and push notifications
    • Payments and in-app purchases
    • Accounts and data on your server, unless your server answers apps on CloudCrane

    Your assistant says plainly what it left out.

    Yours to try first

    1. Published privatelyIt starts with an address only you have, checked and built the same way every time.
    2. Try it on your phoneInstall it from its address, or scan its code from your computer. Use it for a while.
    3. Put it on ExploreWhen it's right. New versions come the same way: a preview you try before phones get it.

    Publishing as a company?

    Apply for verification in your profile, signed in with your work email. Once we’ve checked it, your apps show your organisation’s name with a tick, instead of a handle.

    Blackbox

    Our open-source tool (MIT) that drafts your app’s spec on your machine, with none of your code in it. Set it up by asking your own coding assistant, or read how it works step by step.

    GitHub npm

    Blackbox turns an app you already have into a spec with none of your code in it, which builds into the same app every time.

    It reads the app you already have, on your machine. It never runs your code, and sends nothing anywhere.