Signal is Free and Open Source, enabling anyone to verify its security by auditing the code. TextSecure is the only private messenger that uses open source peer-reviewed cryptographic protocols to keep your messages safe.

Signal uses an advanced end to end encryption protocol that provides privacy for every message every time.

Signal supports: emoji, pictures, videos, audio, contacts, any location and GIF.

One or more con noted it as "single device" not true. I use on phone/tablet/PC all synced

Unlike most messenger apps, Signal works reliably in all countries by securely circumventing internet censorship.

The sender credentials can be encrypted with the rest of the message, leaving only the recipient address readable by the Signal server. Even if Signal wanted they couldn't see who is talking with who by this mean.

Signal Desktop is a Chrome extension that allows you to mirror messages from your phone, including replying.

You can easily view all media shared in the chat without scrolling back to when it was shared.

Signal can also be your default SMS/MMS text messenger. Encryption is not possible when sending SMS to your contacts.

Edward Snowden uses this messenger and recommends it to everony who is concerned about his privacy.