When comparing Instagram Direct vs StealthChat, the Slant community recommends StealthChat for most people. In the question“What are the best messaging apps for Android?” StealthChat is ranked 17th while Instagram Direct is ranked 47th. The most important reason people chose StealthChat is:
Messages can be set to self-destruct after a set time.
Specs
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Pros
Pro Video & photo messages
Photos have to be cropped to be square.
Pro Filters
That can be applied to photos and videos.
Pro Group messages
With up to 15 people.
Pro Can send self-destructing messages
Messages can be set to self-destruct after a set time.
Pro Offers 3 types of encryption
The app claims to be the only communication app that encrypts data in transit, on disk and on screen. Encryption in transit is used to make sure no-one can listen in on your conversations even if the traffic is going through their servers, encryption on disk is used to make sure that even if someone gets ahold of your phone and is capable of extracting your messages from it they won't be able to read them and screen encryption is essentially a lock screen that sets in after a set amount of time used to make prevent "shoulder surfing".
Cons
Con Walled garden
Can't communicate with people outside of Instagram.
Con Many people have difficulty registering the app
Multiple people have reported not being able to receive the activation code required to register the app.
Con Code is not verified
Con Poor support
Con Lacks group chat
Con Closed source
No way to verify security practices.