Pretty good but A couple recommendations ..

The app works well and the black bubble and lemon texting are great ideas. A few issues however:

Its great that when you leave the app (even without closing it) your displayed decrypted message/pic disappears. The only way for someone to bring it back is to repaste and input pw. HOWEVER if you dont use the page turn icon or close the photo or app then your secret photo stays displaying in the app. i.e. youre viewing private photo and someone walks up quickly so you quickly hit home button. The app is still open in the background so if you forget to go back and close that pic then someone can pickup your phone and open that app and your pic will still be displayed without re-entering a pw. Please fix this.

Also you can use link method where you can just press the link in regular iMessage and hit open. That opens the program automatically and gives you a pw prompt. Very few steps. However if you attach a photo it converts automatically to black bubble method.

If these things were fixed (mainly the photo staying issue) then it would be a 5 star app.

Eb-one about Black SMS - Protected Texts