Year of launch: 2009
User IDs used: phone number
Supported platforms: Android, iOS, Windows Phone, KaiOS, Tizen. There is a desktop version
Declared security: personal correspondence and calls are protected by end-to-end encryption
What data does it collect: metadata of messages and calls, the phone number of the user and his interlocutors, data about the device used, IP addresses and information about the mobile network, geolocation, payment information.
Advantages: standard. You can delete sent messages, search the correspondence, and turn off notifications for individual conversations. In addition, there are so-called secret chats.
What users are talking about: Asking for a dark theme and the ability to use the Apple Watch, and disagreeing with the new user agreement policy.
Events: Has repeatedly been at the center of data breach scandals. For example, Deutsche Welle journalist Jordan Wheeldon found that using Google, users can find links to private chats.
Later, cybersecurity researcher Atul Jayaram was able to find about 300 thousand mobile numbers of users in the public domain, the vulnerability was tied to the use of a QR code.
In addition, users who have installed biometric identification for WhatsApp on their smartphones will soon be unable to use the browser or desktop version without unblocking WhatsApp using biometrics.
Disadvantages: When you delete a sent message, the interlocutor will have a notification, it is impossible to send a message to a user who is not in contacts, and to minimize the application when you listen to voice messages. But these are all small things compared to the transfer of data to Facebook, which has repeatedly found itself at the center of scandals due to data breaches.