When comparing Fade In vs Trelby, the Slant community recommends Fade In for most people. In the question“What is the best screenwriting software?” Fade In is ranked 1st while Trelby is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pro Uses an open file format providing compatibility and future-proofing
Pro Cross-platform desktop and mobile
Fade In is available for Windows, OS X, Linux, Android and iOS.
Pro Revision control
Pro Distraction-free mode
FadeIn has a fullscreen mode that removes everything but the page allowing you to better focus on writing.
Pro Offers cloud storage service
Pro Free, open source and cross-platform
Trelby is available absolutely free for Windows and Linux with source code available on GitHub.
Pro Final Draft compatible
Can import and export .fdx files.
Pro Can highlight differences between different versions of a script
Pro Has a character name database
A character name database with 200k+ names from various countries is built into Trelby.
Interface/menus very ugly and dated.
Con English only
Trelby supports the ISO-8859-1 character set, any characters that are outside of that set are not supported.
Con No longer maintained
Right now in 2018, most recent updates are from three or more years ago. This creates problems installing the .deb releases on certain linux distros, and means it probably wont be getting long term support anymore.
Con Can't use bold, italic, underline
Con No online collaboration capabilities
Con Lacks revision tracking
Con No OSX version
Trelby is only available on Windows and Linux.