Free tools for HTML apps
Ten utilities for the parts of an HTML app a converter can't do for you. Everything runs in your browser — nothing you paste or open is uploaded.
Phone Frame HTML Preview
Preview HTML inside an Android phone at real sizes.
Touch Target Size Checker
Flag buttons and links smaller than 48×48px.
Android Intent Link Builder
Links that open the dialer, WhatsApp, Maps and more.
APK Install Error Decoder
Turn ‘App not installed’ into a cause and a fix.
Dark Mode CSS Generator
Matched light & dark palettes as CSS variables.
App Colour Contrast Checker
WCAG contrast check with a passing colour suggestion.
On-Screen Error Console
See JavaScript errors inside your APK, no DevTools.
CSS Loading Screen Generator
A branded launch/loading screen in pure CSS.
Markdown to HTML Book
Markdown in, offline reader app index.html out.
Android Viewport Sizes
Common CSS viewport widths and ready media queries.
Turn your HTML into an APK today
Install the free builder on your Android phone, add your HTML file, ZIP or website, and install a signed APK a few minutes later. No watermark, no card.