Best Markdown apps for iPhone: what belongs on the list

The useful iPhone stack is not one giant app. It has an AI or source app, Files or cloud storage, a transfer path such as Mail, AirDrop, Slack, WhatsApp, or Telegram, and one focused Markdown viewer for the final open-and-read step.

Md Preview is the focused viewer slot

Md Preview is built for the viewer slot: open .md, .markdown, .mdx, .rmd, .qmd from Files or the iOS Share Sheet, preview locally, and avoid turning a quick file check into a full editor workspace.

Where editors, browsers, notes, and cloud apps fit

Editors are useful when you need to change code. Browsers help with web links. Notes apps organize long-term writing. Cloud apps sync files. None of those categories replaces a fast local viewer when the immediate job is to open the Markdown file on iPhone.

AI tools made this category more important

ChatGPT, Claude, Gemini, Perplexity, Copilot, DeepSeek, Cursor, Codex, v0, and other AI tools can produce reports, artifacts, prototypes, specs, and notes as real Markdown files. The broader best-apps query is growing because users now need to inspect those generated files away from a desktop.

Selection checklist before installing

Prefer apps that open from Files and Share Sheet, support real .md, .markdown, .mdx, .rmd, .qmd, keep preview on device, avoid forced accounts, avoid ad clutter, and expose a clear App Store install path. Md Preview has no subscriptions, no in-app purchases, and no ads.

Add the HTML companion

AI and document workflows often produce both Markdown and HTML. Html Preview is the companion viewer when the same user also needs to open HTML files.