Zalo

Zalo is the default messaging app in Vietnam, with a reach there comparable to WhatsApp's in other markets — most people use it for personal chat, and businesses use it for customer contact.

Beyond messaging it carries payments, mini-programs and Official Accounts, so brands can run a storefront, send notifications and handle support without the customer leaving the app.

For anyone selling into Vietnam, a Zalo Official Account is usually a requirement rather than an option: customers expect to reach you there, and message open rates are far higher than email.