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Fcitx 5 vs GoTiengViet: catalog facts
Fcitx 5	GoTiengViet
Free Free and open source under the LGPL 2.1 or later.	Freemium Free to download, with a paid license available for the macOS version.
Linux	Windows, macOS, Linux
Supports many languages through numerous input engines Slim core extended with addons	Several typing styles and character encodings Converts text between Vietnamese encodings
Linux and Unix only Setup involves installing separate engines and configuring the environment	Website is mostly in Vietnamese Linux version depends on IBus
Downloadable app	Downloadable app
Open source	Closed source
License: LGPL-2.1-or-later	License not stated
No account needed	No account 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 1, 2026

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