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

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