Only the current version so far — new entries appear as the app ships updates.
TTRS Live Chat is a communication app by NECTEC (member of nstda) with 10,000+ downloads (about 12K estimated). +14 installs in the last 7 days. Released Feb 6, 2017. Install growth, rank history, SDKs and ad networks.
From the store listing: “An application communication relay chat messages. Services for the hearing impaired.”