Hey, me again. Posted MerMark Editor here a while back — first Yes, I know Obsidian exists. Yes, Obsidian has AI plugins. If you live inside a vault with a graph view, daily notes, dataview What MerMark is: a stupid-simple editor that opens .md files Editing WYSIWYG Markdown — formatted text as you type, not raw syntax Code view — toggle to raw Markdown with cursor position tracked across both views (Ctrl+Shift+V) Split view — edit two documents side by side, draggable divider Syntax highlighting in code blocks, 50+ languages Tables, task lists, blockquotes, footnotes, page breaks Character and word count, auto-save, undo/redo Mermaid diagrams (the "Mer" in MerMark) Renders inline as you type Flowcharts, sequence, class, state, ER, Gantt, pie, C4, journey, gitgraph, mindmap, timeline, quadrant, requirement, block, treemap, xy-chart, architecture Zoom controls + fullscreen mode (up to 400 % for detail work) Resizable code/preview split inside the fullscreen editor New diagrams default to 25 % scale so they don't overflow Crisp PDF export (vector, not rasterised) File handling File watching with auto-reload on external changes Conflict detection with merge dialog. If you've made local edits and the file changes underneath you — another app, a git pull, a sync client, or the AI panel writing to disk during a chat turn — MerMark stops, shows you a side-by-side diff of your unsaved changes vs. what landed on disk, and lets you decide per-side which version wins. No silent overwrite either way. Works the same whether the "external" change is your own AI asking the model to rewrite a paragraph or a teammate pushing to a shared folder. Atomic save — .tmp write + verified rename, no silent overwrites if the file changes mid-save either Drag & drop .md files into the editor from your file manager Manual reload from disk (Ctrl+R) Tab tooltips with full file path on hover; duplicate filenames show parent folder prefix to tell them apart Tabs and windows Multiple documents in tabs, Ctrl+W close, Ctrl+Tab cycle, Ctrl+1..9 jump Multi-window — open as many independent editor windows as you want Cross-window drag & drop tabs between panes and windows Compare and track changes Compare Tabs — diff between left and right pane documents (Ctrl+Shift+C) Change Tracking — view all additions and deletions since last save (Ctrl+Shift+D) Themes and zoom Dark and light app themes Separate code-block themes — pick the syntax-highlight scheme independently from the app theme. Includes a white variant added in v0.2.0 so light mode doesn't clash. Editor zoom (Ctrl+Scroll, or toolbar +/−/100 %) Mermaid preview zoom independent of editor zoom Token counter Live estimate for OpenAI (GPT family), Anthropic (Claude family) and Google Gemini — useful before pasting into a chat Other Export to PDF with proper formatting Plain .md files on disk — git diff still works Keyboard shortcuts modal (Ctrl+/) auto-renders Mac glyphs (⌘ ⇧ ⌥) on macOS Lightweight (~15 MB), Tauri-based, not Electron Everything stays local, no cloud, no account, no telemetry Bilingual UI (was English + Polish; v0.2.0 adds Chinese — see below) This is the headline feature and it's worth explaining because The trick: MerMark doesn't have its own model and it doesn't ask It shells out to whatever claude or codex What it can actually do: Edits your markdown directly. "Rewrite this section friendlier", "extract action items", "translate the meeting notes". The AI writes straight to disk; the editor reloads from the file. Reads across folders you authorize via a per-document access map. Writes peer files when you let it. Generate a summary alongside the source, split a long doc, build a TOC. Optional toggles for shell + web search. Both off by default. Auto-snapshots before every AI write, with a one-click revert. You and the AI can both be editing the same file. If you type while the AI is mid-write, the conflict dialog from the baseline section kicks in and you pick what to keep — your paragraph, the AI's rewrite, or both. No more "AI just clobbered my changes" surprise. You can pin highlighted paragraphs from the editor and the model Threads are per-document and each one remembers the CLI / model / Every tool call (file read, file write, bash, web fetch, codex Bonus — ask the AI to write Mermaid for you.** Paste "draw a block, watch it render inline. Beats hand-tweaking syntax until the arrows line up. ## NEW in v0.2.0 — UI / Layout - **Configurable layout.** Drag toolbar items between top toolbar, bottom status bar, left sidebar, or hide them entirely. Settings → Layout. Persists across restarts. Some items have constraints (Statistics doesn't fit in the narrow sidebar — won't let you drop it there). - **Expandable left sidebar.** Toggle the chevron to widen it from a 40 px icon strip to a 168 px column with text labels. Like VS Code's activity bar. - **Custom fonts.** System font picker for the editor and a separate one for code blocks. Live preview of every font. Adjustable line height. - **Trilingual UI** — English, Polish, Simplified Chinese. - **Page breaks** — `---` actually renders as a page break in PDF export now, not a horizontal rule. - **Table of Contents sidebar** with click-to-navigate (Ctrl+Shift+T). ## NEW in v0.2.0 — bug fixes worth calling out - Cursor mapping across Code ↔ Visual now uses a source-line block parser instead of DOM estimation; survives large code blocks and font-size changes - Code-view tab switching no longer loses content - Trailing blank lines no longer appended on save - Mermaid fullscreen renders at 1:1 instead of inheriting document zoom - macOS file-open handler from #66 ported in - Resilient line numbers when content height changes mid-stream - White theme option for Code view so syntax highlighting plays nice with light mode (#67) ## Links - GitHub: https://github.com/Vesperino/MerMarkEditor (120+ ⭐, 7 000+ downloads) - Download: https://github.com/Vesperino/MerMarkEditor/releases - Release notes for v0.2.0 with all the screenshots: https://github.com/Vesperino/MerMarkEditor/blob/master/RELEASE_NOTES.md Windows, macOS, Linux. Free, MIT, completely local. If you find a bug, open an issue. If you have an opinion about Obsidian, please go post it under one of the eight Obsidian threads on the front page of /r/ObsidianMD instead of mine, appreciated.