dev HTML Playground: Web IDE
View, run & edit HTML with AI
Free · Designed for iPad. Not verified for macOS.
dev HTML Playground lets you build, run and view HTML/CSS/JavaScript entirely on your iPhone. No computer required.
WHO IT’S FOR
* You want to start programming but don’t own a computer
* You want to build apps in spare moments on the train or sofa
* You want AI to write the code while you bring the ideas
* You want to show your kids how fun programming can be
* You want to quickly check HTML documents an AI wrote for you
FEATURES
Code Editor
A syntax-highlighted editor for HTML, CSS and JavaScript with autosave and file management (add, rename, delete). Smart quotes and other typing “corrections” that break code are disabled.
Instant Preview
Run your code with one tap. console.log output and errors appear in a built-in console, so you can debug entirely on your phone.
AI Integration
A ready-made environment prompt for AIs like ChatGPT and Claude. Paste it, and the AI asks “What would you like to build?” — just answer in plain words. Bring the returned code in with one tap using “Paste & Replace All”. You can finish real apps with zero programming experience.
Safe Data Storage
Every project ships with storage.js, a simple persistence library. Your apps’ data is stored safely and kept separate per project. It also works in regular browsers, so your creations are portable.
5 Templates
* Empty Project: start from a clean slate
* Basic Sample: learn the ropes with a counter and notes
* To-Do List: a practical task app
* Habit Calendar: a monthly habit tracker
* Game (NEON RUSH): a full neon mini-game demo
Add to Home Screen
Register your apps as Home Screen icons via Shortcuts and launch them like regular apps.
Export
Export as ZIP (for backup) or a single HTML file (for sharing). Send your work via AirDrop, save to Files, or continue editing on a Mac.
HTML Viewer
Copy any HTML (like a document an AI wrote) and view it with one tap. Everything you view is kept in a history, and you can import it as a project to edit.
Built-in Browser
A browser tab for research or chatting with AI sites, so the whole loop stays in one app.
Everything is free, with no ads. Your “I want to build something” — right in your pocket.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
- New syntax check for pasted code: problems are flagged instantly, and you can copy them for your AI to fix
- Runtime errors now appear on screen — copy and paste them to your AI to get a fix
- Back up and restore your app data (copy as JSON or save to a file)
- New option to erase all saved data of an app
- Clearer visual boundary between your app and the dHP interface
- Apps launched from a Home Screen icon now close just by going Home
The developer, KOICHIRO YAMAMOTO, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- KOICHIRO YAMAMOTO
- Size
- 3.2 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
16+
- 16+
- Contains
Unrestricted Web Access
- Copyright
- © 2026 YAMS