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Trelby vs WriterSolo: catalog facts
Trelby	WriterSolo
Free Free software under the GPL.	Free The listed WriterSolo version is free.
Linux	Linux, Web
Enforces correct screenplay formatting and pagination Imports and exports Final Draft and Fountain files	Works with Final Draft FDX and Fountain formats Exports scripts to PDF and other formats
Interface built with wxPython looks dated next to commercial tools No collaboration or cloud sync features mentioned	Does not include collaboration features
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-2.0	License not stated
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 1, 2026	Official website Full listing and sources Checked October 8, 2026

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