Threema
Threema is a Swiss end-to-end encrypted messenger that can be used completely anonymously: no phone number or email address is required. The apps are open source and independently audited.
Threema is developed and hosted in Switzerland. Unlike most messengers, it does not require a phone number or email address; your identity is a randomly generated ID, which makes truly anonymous communication possible.
Threema is financed by one-time app purchases and business subscriptions instead of data collection. The apps are open source and the service is regularly audited by independent security firms.
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