Changelog

Unreleased

0.1.0

First release. macOS 12 and later, with separate builds for Apple silicon and Intel.

Folding Mirror is a WYSIWYG Markdown editor: source and finished page folded onto one sheet, so what you type is already how it will look. Underneath is always plain .md in a folder you chose — no account, no database, no telemetry.

Writing

Live preview: marks fade behind the words and only the line your caret is on shows its source; a split view is there when you want it.
Formulas: inline and display maths through KaTeX, rendered once the caret leaves the pair.
Tables edited in place: real tables, not a dialog and not a read-only picture; rows, columns and alignment from the right-click menu.
Mermaid diagrams: flowcharts, sequence and Gantt diagrams, in a fence or as a .mmd file.
Drawings: an Excalidraw canvas embedded in the page, resized by dragging, saved into drawings/.
Images and files: drag one in and the file lands beside the document — nothing uploaded, re-hosted or renamed.
Slash menu: type / on an empty line and everything you might insert is listed under the caret; keep typing to filter, press return to place it.
Focus and typewriter modes: dim everything but the paragraph you are in, and pin the current line at a fixed height.

Library

A library is an ordinary folder: the tree in the sidebar is the tree on disk, and renaming or deleting there is real.
Tabs, back and forward: several documents at once; ⌘⇧T brings back a closed tab, still scrolled where you left it.
Links and mentions: join two notes with [[brackets]] and the backlinks grow on their own.
Outline and full-text search: navigate by heading level; click a search result to land on that line.

AI assistant

Bring your own API key: 22 providers preset, requests going from your machine straight to the provider — nothing relayed, no copy kept.
Edits go through you: before a file is written, a command is run or an outside tool is reached, a card lays out what is added and removed, line by line. It reaches disk when you apply it, and a checkpoint of the document is taken first.
It works the app for you: "turn on focus mode", "one size bigger", "show me the source alongside" — said, and done.
Skills and MCP: seven skills built in, three MCP servers built in (Exa, Excalidraw, Mermaid), and room for your own.
Context you can see: how much of the window is used, and how this turn splits between fresh input, cache hits and the reply.

Versions

Document checkpoints: taken as you write, and again before the assistant edits anything.
Library checkpoints: the whole library can go back to a moment in time, with every file added, changed or deleted at that moment listed out.
Restoring has a way back: the current state is checkpointed before a restore.

Export

PDF: A4 in the body font from settings, with the glyphs it used embedded, so it looks the same on a machine that has none of your fonts.
HTML: one self-contained file.
Copy as rich text / copy to WeChat (Chinese interface): inline styles expanded, ready to paste, with five themes.

Interface

Chinese and English, following the system or set by hand.
Separate fonts for the interface, the page and the AI panel; body text size adjustable.
Shortcuts follow Typora's, and every one of them can be rebound with a click.