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Zalo vs Telegram Desktop: catalog facts
Zalo	Telegram Desktop
Free Free to download and use for messaging and calls.	Freemium Free to use. Telegram Premium is an optional subscription for larger uploads, faster…
Windows, macOS, Android, iOS	Windows, macOS, Linux
Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app	Official client with published source and build instructions Cloud chats sync instantly across every device you sign in on
Official site is mostly in Vietnamese Closed source, run on the developer's servers	Ordinary chats are not end-to-end encrypted and Telegram holds the keys Secret chats are not available in the desktop client
Downloadable app, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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