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

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