A Markdown editor, viewer
and Finder preview

Yes. It opens any .md file with Command O, edits it, and switches between raw Markdown and a rendered view with a View/Edit toggle.

It renders GitHub Flavored Markdown including tables, task lists and strikethrough, with syntax-highlighted code blocks you can copy in one click, and search works across the rendered preview rather than the raw source. It can also be set as the default app for Markdown files, so double-clicking one opens TypeFire.

There is a one-click setting inside TypeFire that registers it as the handler for the standard Markdown file type.

After that, double-clicking any .md file opens it in TypeFire. You can also do it the manual macOS way: right-click a .md file in Finder, choose Get Info, pick TypeFire under Open with, and press Change All.

Yes. TypeFire installs a Quick Look extension, so selecting any .md file in Finder and pressing space renders it with headings, lists, tables and syntax-highlighted code blocks instead of raw source.

It works on every Markdown file on your Mac, not only files TypeFire created, and it costs nothing.

Yes. Tables, task lists, strikethrough and autolinks all render, alongside standard Markdown headings, lists, quotes, images and links.

Code fences are syntax highlighted and each block has a copy button.

In a folder you choose. Snippets are plain Markdown files on disk, readable in any editor, backed up however you back up anything else, and there is no proprietary database to escape from.

Reading a folder never rewrites it: TypeFire only writes to a file when you edit and save that specific file.

Yes. Editing, the Quick Look preview, the text expander and Markdown snippets that expand as styled HTML are all free with no cap and no trial.

Pro is a separate one-time purchase covering unlimited clipboard clips, Selection Prompts and Prompt Chains, none of which relate to Markdown.

It depends what you use them for. For opening, reading, editing and previewing Markdown files it is a capable free replacement, and it adds Quick Look in Finder which neither offers.

For inline WYSIWYG writing Typora is better, and for a linked knowledge base with backlinks and a graph Obsidian is better. Many people run TypeFire alongside them for Quick Look and snippet expansion.

An editor lets you write and save changes. A viewer only renders a file for reading.

Marked 2 is a viewer, Typora is an editor, and Quick Look extensions are viewers built into Finder. TypeFire covers all three positions: it edits, it renders in-app, and it previews in Finder without opening anything.