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Markdown Monster vs Apostrophe: catalog facts
Markdown Monster	Apostrophe
Paid Commercial software with a free trial available.	Free Free and open source under the GPL-3.0-or-later licence.
Windows	Linux
Synced live preview that follows the cursor and scroll position Two-way table editor and image paste from the clipboard	Focus mode for distraction-free writing Live rendered preview
Windows only Paid licence after the trial	Linux only Edits single files rather than managing a notes library
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.