Overall, Signal is a feature-rich messaging app, in addition to its privacy features. As a result, I greatly prefer the experience over WhatsApp.

A cybersecurity expert explains what features to look for when choosing a secure messaging app amid White House controversy over Yemen attack plans.

Signal is a messaging app that's available for iOS and Android devices. Like the best messaging apps, it supports cross-platform text, voice and video chats.

But Signal can have group chats with up to 1,000 people. Signal is free to download in the Apple App Store for iPhone and available for Android devices on the Google Play Store.

The first is that once you start messaging anyone with an Android device, it will fall back to RCS, or, worse, SMS—neither of which are encrypted within the Messages app. RCS supports E2EE, but ...