Signal has reproducible builds for at least Android: https://github.com/signalapp/Signal-Android/tree/master/reproducible-builds https://github.com/signalapp/Si

Signal has reproducible builds for at least Android: https://github.com/signalapp/Signal-Android/tree/master/reproducible-builds https://github.com/signalapp/Signal-Android/tree/master/repr... You compare the result you get compiling the app yourself with what you downloaded from the Play Store. For iOS this might be harder