Vellum vs OpenHTML

Some HTML documents and statements just won't open in Mail or Safari on your iPhone—leaving you stuck, or reaching for a Windows PC. Vellum is the simple, fast viewer that opens them right where you are. Wherever the file arrived—Mail, a messenger, Files, or a browser—just tap "Open in Vellum" and it opens instantly, rendered cleanly and completely. Opens right from any app See a document in Mail or Files? Tap "Open in Vellum" and it's there at once. No setup, no sign-up. A built-in guide walks you through it the first time. Opens what others can't HTML files and statements that won't display elsewhere open perfectly here—nothing broken, nothing missing. Read it your way Search for any word inside a document, pinch to zoom in as close as you like, and export an HTML statement as a clean PDF to keep or share. Auto-saved and organized Files you open are saved automatically and grouped by month. Pin the ones you reach for, sort by date or name, and find anything again in seconds. Yours alone No account, no servers, no ads. Lock the app with Face ID, hide its contents when you switch apps, and let old files clean themselves up. Everything stays on your device. Open any document, right from your hand.

OpenHTML is a private, on-device viewer for HTML, Markdown, ZIP web projects and source files on iPhone and iPad. Open files from Files, Mail, chat apps, AI tools or Safari. Preview pages offline, inspect what went wrong when a file does not render, and export finished pages when you need a clean copy. What you can do: - Open .html, .htm, .xhtml and Markdown files - Import ZIP archives and multi-file web projects - Render LaTeX math in Markdown offline, with no scripts - Preview local pages with network access off by default - Diagnose missing files, blocked resources and JavaScript issues - View JSON, XML and source files with a code-friendly reader - Export full pages to PDF or long images with OpenHTML Pro - Keep selected files in your OpenHTML folder in iCloud Drive and open them on your other devices with OpenHTML Pro Private by default: OpenHTML has no accounts, no analytics and no ads. Files are copied into the app's private storage and stay on your device unless you add them to your own OpenHTML folder in iCloud Drive. Remote resources stay blocked unless you choose to allow them for a trusted document. OpenHTML is designed for developers, students, researchers, writers and anyone who receives HTML reports, AI-generated pages, saved webpages or packaged web projects and wants to inspect them safely on iOS.