What are some alternatives?
When comparing Signal and WhatsApp, you can also consider the following products
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Riot.im - Open source interoperable collaboration app.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Slack - A messaging app for teams who see through the Earth!
Facebook Messenger - Facebook Messenger is a faster way to message.