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WriterDuet vs Highland Pro: catalog facts
WriterDuet	Highland Pro
Freemium A free tier is available, with paid plans for more features.	Freemium Distributed through the App Store; check the store listing for current pricing.
Web	macOS, iOS
Real-time co-writing on the same script Covers planning, writing and sharing a script	Handles screenplays and prose manuscripts in one app Native apps for Mac, iPad and iPhone
Proprietary software Mainly useful for scripts rather than general writing	Apple platforms only, no Windows or Android version Sync depends on iCloud
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it 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.