Signal chat app

Signal is an open-source, encrypted messaging application that offers instant messaging, voice calls, and video calls. Developed by the Signal Technology Foundation, a non-profit organization based in the United States, Signal is renowned for its strong end-to-end encryption, ensuring that only the intended recipients can read the messages. The foundation was established in 2018 with initial funding of $50 million from Brian Acton, co-founder of WhatsApp. As of 2025, Signal has approximately 70 million monthly active users worldwide. The application is available on multiple platforms, including Android, iOS, Windows, macOS, and Linux. Signal's commitment to privacy and security has made it a preferred choice for users seeking confidential communication, including government officials and activists. The foundation operates independently, relying on donations and grants to fund its operations, and does not display advertisements or collect user data for monetization purposes.