HTML++ Viewer

HTML++ Viewer Sandbox Studio is a standalone container and development tool for running, debugging, and testing HTML5, CSS3, and JavaScript applications directly on Android.

The app allows you to launch any local HTML files and web pages without external servers. An integrated interactive code editor and sandbox with demo projects let you edit code on the fly and immediately test scripts, Canvas graphics, sound APIs, and local storage.

A key feature is turning any HTML code or file into an independent application right on your Android home screen. Shortcuts feature detailed icon customization (choice of shape, background, vector icons, or custom images) and launch in a clean, full-screen mode without browser UI or system bars.

Debugging tools include real-time JavaScript console log interception, screen emulation for various devices (mobile, tablet, desktop), User-Agent switching, and pinch-to-zoom page scaling.

Additionally, it features file download interception and saving, a built-in system permission manager for Web APIs (camera, microphone, geolocation), flexible interface themes and accent color customization, and support for 12 languages.

No permissions are required; you can enable them to extend the capabilities of your HTML code. You can grant the ‘Access to all files’ permission so that the app can compile a list of all your .html files.