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yWriter vs WonderPen: catalog facts
yWriter	WonderPen
Free Free software from Spacejock Software.	Paid Proprietary software sold through a purchase page on the developer's site.
Windows, macOS, Android, iOS	Windows, macOS, Linux
Free with no bundled toolbars or adware Organises chapters, scenes, characters and locations	Unlimited-depth tree for chapters and documents Export to PDF, Word, EPUB and web pages, including whole books
Mobile versions depend on Dropbox for sync macOS version is still being developed	Proprietary and paid Cloud sync relies on the developer's own service
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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