One screen, no state
Add onboarding, a settings screen and a history or saved-items view. Three screens with real navigation already read as an app.
What you actually have
A Canvas app is usually one file: HTML with inline CSS and JavaScript, or a single React component with everything in it. State lives in memory or localStorage, there is no routing, no backend, and if it calls an API the key is in the client. The preview runs in a sandboxed frame on an OpenAI domain, which is why the readiness check flags it: it is not a production host, it is not your domain, and it can disappear when the conversation does.
None of this is a problem. It is a prototype, and prototypes become apps by getting a home, a structure and one reason to exist as an app rather than a web page.
Canvas to a hosted app
About an hour of work for a single-file app.
Export the code
Copy the complete file out of the canvas (or use the download option) and put it in a new folder. If ChatGPT split it into several files in the conversation, collect all of them; ask it to "print the complete, final version of every file" if you are unsure.
Make it a repository
Create a GitHub repository with the file as
index.html(or a small Vite project if it is React). From here on, Codex or Cursor can work on it like any codebase.Host it on a real URL
GitHub Pages, Netlify, Vercel or Cloudflare Pages serve a static app for free with HTTPS. Add your own domain if you have one; the domain guide explains why it is worth doing before submission.
Add navigation and the legal pages
A settings screen, an about screen, /privacy and /terms. Even a small app needs a privacy policy URL in both consoles, and a settings screen is where push, account and support links live later.
Persist what matters
localStorage is fine for a notes or timer app with no accounts. The moment users sign up, you need a backend (Supabase or Firebase are the usual choices) and an account deletion path.
Wrap it with WebViewGold
Insert the URL in Config.swift and Config.java (or the Cloud Builder), set name, icon and splash screen, enable the offline screen, build and submit. Deploys to the URL update the app instantly.
Signs the app is too thin, and the fix
No reason to notify
Reminders, streaks, daily prompts, order updates: pick one. WebViewGold schedules a local notification from your page with sendlocalpushmsg://push.send?s=SECONDS=msg!MESSAGE&!#TITLE&!#URL, no push provider needed.
Dies without a connection
A static app can work fully offline: keep data in localStorage and let WebViewGold show its offline screen only when the page itself cannot load.
Nothing native to touch
A share button via shareapp://message?=TEXT&url=URL, haptics on completion, or the QR scanner (qrcode://) are one-line additions that reviewers see.
Prototype vs store-ready
| Canvas prototype | Store-ready app | |
|---|---|---|
| Hosting | Preview frame on an OpenAI domain | Your HTTPS URL, ideally your domain |
| Structure | One file, one screen | Routes: home, settings, about, privacy, terms |
| Data | In memory | localStorage, or a backend with account deletion if there are accounts |
| Mobile layout | Looks fine in the preview | Verified at 320 px, safe-area insets, 44 px targets |
| Native value | None | At least one: notifications, offline, share, scanner, Face ID |
| Listing | n/a | Screenshots from the app, honest description, privacy URL, review notes |
Grow it with Codex
This turns the single file into a small product without changing its look.
Paste into Codex in the new repository
This repository contains a single-file app exported from ChatGPT Canvas. Turn it into a small production web app that will also run inside a native iOS/Android wrapper (WebViewGold): 1) keep the current look, but add client-side routing for /, /settings, /about, /privacy and /terms; 2) persist user data in localStorage behind a small storage interface so we can swap in a backend later; 3) add a three-bullet onboarding screen shown once; 4) apply mobile rules: meta viewport with viewport-fit=cover, no overflow at 320px, 44px tap targets, safe-area insets on fixed bars, inputs of at least 16px; 5) add empty and error states; 6) create isNativeApp() that checks navigator.userAgent for the marker MYAPPNATIVE; 7) in settings, add a Notifications toggle that navigates to registerpush:// when isNativeApp() is true, and a Share button that navigates to shareapp://message?=TEXT&url=URL in the native app and uses the Web Share API otherwise. Finish with a list of what the app would still need to feel complete.
What to tell the reviewer
Small apps pass when the listing is honest and the notes are clear: what the app does, that it works offline, which notifications it sends, and that it uses a native wrapper with those features on top of your web app. Do not oversell a focused utility; "a simple habit tracker with daily reminders" is a perfectly good App Store app. Screenshots from the built app, a privacy URL that opens, and a settings screen with a support email round it off.
Frequently asked questions
Can I keep React from a CDN in a single HTML file?
It works, but a small Vite project builds faster, loads faster on mobile and is easier for Codex to extend. Ask Codex to migrate it; the component code stays the same.
Can I use the Canvas preview link as the app URL?
No. It is a sandboxed preview, not a hosted site, and the readiness check will flag it. Host the code on your own URL first.
Do I need a backend?
Only if users create accounts or share data between devices. A notes, timer or calculator app can run entirely on the device with localStorage and still pass review, as long as it has structure and one native feature.
Does Apple reject single-purpose apps?
No. Apple rejects apps with no functionality beyond a website or with almost no content. A focused app that does one thing well, works offline and sends reminders is fine.
Three ways to get your app into the stores
Same result, different amount of work on your side. All three come with the approval guarantee and 24/7 human support.
Do it yourself
$109 per platform, one-time
The WebViewGold license: a finished Xcode or Android Studio project. Paste your URL, set name and icon, switch on features, build and submit. Free updates forever.
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No Mac, no Xcode, no Android Studio: configure in the browser, we build both apps in the cloud and hand them to App Store Connect and the Play Console.
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