If privacy is important to you, Signal is a superb app. Signal uses heavy-duty encryption to keep your messages away from prying eyes, be they government or corporate. No one can read your Signal messages and you can rest easy knowing that what you say is in confidence.
Signal is so secure that it’s even become the app of choice for the European Commission.
Signal refuses to keep user records and does not track your activity. You can also set up extra security on the app itself, like that you would find on a mobile banking app. For instance, you can make it so that logging into Signal requires your FaceID or a PIN.
It will also not display any received messages on your lock screen. You’re also able to verify that the person you’re talking to is who they really say they are. This means that you’re not going to fall victim to a scam or be the target of spearphishing.
All in all, if you want to find the most secure app around, Signal is the answer. It may not top the list of any “most popular messaging apps by country” lists, but it offers peace of mind and that’s invaluable.