TalkTextChat

TalkTextChat suports converting your side of the conversation via text entry then converts to speech for the hearing person and captures the hearing persons spoken word converting it to text for you to read. Has built in phrases to start and support conversations with the hearing much quicker.  
PRIVACY: NO DATA/USAGE is COLLECTED or SHARED.  
END USER AGREEMENT: App agreement is the Apple's standard EULA https://www.apple.com/legal/internet-services/itunes/dev/stdeula/