Ulysses

From RaySoft

Ulysses is your one-stop writing environment for Mac, iPhone and iPad. Its pleasant, focused writing experience, combined with effective document management, seamless sync, and flexible export, make Ulysses the first choice for writers of all kinds.[1]

Documentation

Hints

Get the X-Callback-URL from a sheet or group in macOS[2]
  1. Hold the "⌥ Option" key
  2. Right-click on a sheet or group
  3. Choose "Copy Callback URL"
Get the X-Callback-URL from a sheet or group in iOS[2]
  1. Swipe-left on a sheet or group
  2. Choose the "More" button
  3. Choose the "Share" action
  4. Choose "Copy Callback URL"

References