New Media Writer
newmediawriter.app — download for Mac.
A minimalist, focus-first Markdown writing app for macOS. Write once in Markdown, then preview the same file as it would appear in the feed:
- Plaintext — the raw Markdown source.
- Markdown — Typora-style WYSIWYG (syntax hides when the cursor leaves the line).
- X — post (threads split on
---, Premium 25k counter, bold/italic preserved).
- LinkedIn — full post with the "…more" fold marked at ~210 chars, 3,000 cap.
- Slack — channel view with mrkdwn-style rendering.
Images pasted or dropped into the editor are copied to an assets/ folder next to the document and inserted as relative Markdown links; they render inline in the editor and as media in every preview.
Every view has a Copy button (⇧⌘C) that puts the document on the clipboard in the format that view's composer expects: raw Markdown, rich text for X (per-post for threads), plain text for LinkedIn, and Slack mrkdwn (*bold*, _italic_, • bullets, > quotes, fenced code) plus an HTML flavor for Slack's rich composer.
Build
Requires Xcode 16+ and xcodegen (brew install xcodegen).
xcodegen generate
xcodebuild -project NewMediaWriter.xcodeproj -scheme NewMediaWriter -configuration Debug -derivedDataPath build CODE_SIGNING_ALLOWED=NO build
open "build/Build/Products/Debug/New Media Writer.app"
Or open NewMediaWriter.xcodeproj in Xcode and run.
Releasing
Every push to master runs .github/workflows/release.yml, which tags the next patch version (v0.1.2, v0.1.3, …),
builds a Release archive signed with a Developer ID certificate, notarizes it, wraps it in a DMG and attaches it to a
GitHub Release — so /releases/latest/download/New-Media-Writer.dmg always serves master. Pushing a tag like v0.2.0
by hand releases that explicit version. Pushing a release-dry-run/** branch runs the same signing + notarization and
uploads the DMG as a workflow artifact without publishing a Release.
Repository secrets it expects:
| Secret | Value |
|---|
MAC_CERT_P12 | base64 of a "Developer ID Application" certificate exported as .p12 (base64 -i cert.p12) |
MAC_CERT_PASSWORD | password used when exporting the .p12 |
APPLE_TEAM_ID | 10-character team ID from developer.apple.com → Membership |
NOTARY_KEY_P8 | base64 of an App Store Connect API key (.p8, Team Key, role Developer) |
NOTARY_KEY_ID | the key's ID |
NOTARY_ISSUER_ID | the issuer ID shown on the Integrations → Team Keys page |
Local builds keep ad-hoc signing (CODE_SIGN_IDENTITY: "-" in project.yml); nothing here changes how you run
from Xcode.
Shortcuts
| Action | Keys |
|---|
| Plaintext | ⌘1 |
| Markdown | ⌘2 |
| X | ⌘3 |
| LinkedIn | ⌘4 |
| Slack | ⌘5 |
| Copy for current view | ⇧⌘C |
Bold / Italic / Strikethrough (toggle ** / * / ~~ around the selection) | ⌘B / ⌘I / ⌘E |
| Switch view by typing its name (e.g. "sl" → Slack) | ⌘K |
| Previous / next view | ⌥⌘← / ⌥⌘→ |
| Insert link (uses a URL from the clipboard if there is one) | ⇧⌘K |
Paste a URL over selected text to link it ([text](url)) | ⌘V |
| Find / Find and Replace | ⌘F / ⌥⌘F |
| Find next / previous | ⌘G / ⇧⌘G |
| Bigger / smaller / actual-size text (Plaintext and Markdown views) | ⌘+ / ⌘− / ⌘0 |
| Bulleted / numbered list (Enter continues a list, Enter on an empty item ends it) | ⌥⌘U / ⌥⌘O |
Set your name, handle, headline, avatar and Slack channel in Settings (⌘,) so previews look like you.
