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yWriter vs Hammer: catalog facts
yWriter	Hammer
Free Free software from Spacejock Software.	Free Free and open source under the MIT licence.
Windows, macOS, Android, iOS	Windows, Linux, Android
Free with no bundled toolbars or adware Organises chapters, scenes, characters and locations	Native apps rather than a web page in a wrapper Runs on phones and desktops
Mobile versions depend on Dropbox for sync macOS version is still being developed	Issue reporting is steered towards Discord Feature details are sparse in the available documentation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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