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Thursday, April 21, 2022

General information

Deaf Hearing Chat system (Android ver.)

Download free limited demo version here!

A new complex for connection of a deaf person with a hearing one, which gives an amazing opportunity of real communication.

The complex consists of two Android-devices connected with each other by means of Bluetooth. One of the devices, called “device-D” (Deaf Person), is kept by a deaf person. The other one, called “device-H” (Hearing Person), is kept by a hearing person.

The application for the device-D, called Deaf-Hearing Chat Device D, enables a deaf person to type text messages on a virtual keyboard and to send them to the device-H (the button “Send”). Each sent message can be duplicated by the synthetic speech (the button “Speak and Send”). For the synthetic speech a speech synthesis module should be installed on the device (usually it’s installed; if it’s not it can be downloaded from Google Play, e.g. SVOX classic TTS or Pico TTS). The messages, received from the device-H, are shown on the display.

The application for the device-H, called Deaf-Hearing Chat Device H, enables a hearing person to type text messages on a virtual keyboard or using voice input (the button “Voice Input”). You need an Internet access for voice input. To test the Internet connection quality you should press the button “Test”. To send a message to device-D you should press the button “Send”. The messages, received from the device-D, are shown on the display.
Supported languages for voice input: English (US, UK, Australia, Canada, India, New Zealand, South Africa ), French, German, Italian, Russian, Hebrew, Spanish (Spain, US, Argentina, Bolivia, Chile, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, Uruguay, Venezuela), Japanese, Portuguese (Brazilian), Czech, Turkish, Dutch, Mandarin Chinese (Traditional Taiwan, Simplified China, Simplified Hong Kong), Korean, Indonesian, Malaysian and some others.

The exchange of messages is possible in any language supported by your Android-device. Such complex can be used in any country. All messages between the devices free of charge.

Once again, pay your attention that for the use of the complex you need to install the following:
- for the device D – the application Deaf-Hearing Chat Device D;
- for the device H – the application Deaf-Hearing Chat Device H.

This complex gives to deaf person fantastic capabilities for communication. Device-D and device-H connect via bluetooth.
You can choose one or more of the three variants of the complex:
1. phone(as device-D) + phone (as device-H)

This variant is very convenient for constant communication, for those families in which there is a deaf member. Each message is followed by vibration, so one can always call a deaf person, address him (or her).

2. phone (as device-D) + tablet (as device-H)

A deaf person can always have complex with himself (herself). It’s very convenient for communicating freely with the hearing people in public places: shops, hospitals, service centers, etc. A deaf person just hands a tablet to a manager or a consultant, and after that they can communicate freely. The convenience of a tablet is that at its small size its keyboard is big enough, so that everyone can type a big volume of text. It’s better to use a 7” tablet. The convenience of a smartphone is its compactness, and the deaf people usually type messages on its virtual keyboard very quickly.

3. tablet (as device-D) + tablet (as device-H)

This variant can be useful for a services sector, where the deaf people are served. For serving a deaf client the latter is given the device-D, the device-H is kept by a hearing manager, after what they start communicating.
Also, if a deaf person has difficulties with typing messages on a small smartphone keyboard the complex “a tablet + a tablet” will be more convenient.

User review from US
User review from Russia
User review from Netherlands
North Dakota Interagency Program for Assistive Technology Review

download applications for device-D and Device-H from Google Play

If you have any questions, please ask in comments.


  1. Hello my name is Mike Boyd a developer and inventor in the silicon valley. Looks like we are working the same area for the deaf. We have a slightly different aproach but I think we could be useful to each other.

    I would like to speak with you about what we are doing.

    I think we might want to hire you!

    give me a call in the us 408.504.2185

    Im assuming from the screen shots you speak english and if not a have a russian programmer to translate.

    mike boyd

  2. Hearing power one of the best gift of god to the humane. Need to same it by hearing loss. This is nice information posting. Thanks for sharing abut hearing power with us.

  3. Need help connecting. Have the test spps loaded on android phone and tablet. Hsve bluetooth for ghe two devices connected. Have wifi on.

    Both devices say "not connected". Dont know what to do to connect them. Want to test before purchasing.


  4. if both devices already paired:
    1. launch app on each device
    2. press context menu button on the first device
    3. press connect button on the first device
    4. choose second device from paired
    if devices not paired:
    1. launch app on each device
    2. press context menu button on the first device
    3. press context menu button on the second device
    4. press turn server on button, then press 'yes' on the first device
    5. press connect button on the second device
    6. press 'scan' button on the second device and when devices find each other, confirm the connection

    It's very easy. Longer to write than do.

  5. This comment has been removed by a blog administrator.

  6. I get a NO CONNECTION notice when I go through the process of connecting like above

  7. It was hard to get it to make the connection when I bought the app. but it started connecting finally. But that was a year ago and how I seriously need it with the deaf and get NO CONNECTION. I have Nexus tablets.

  8. Situation because of old age both my parents are almost deaf and need to communicate with each other. They do not know sign language and I will buy them each an android device hopefully using your program. How do I configure each android tablet? Each with program D or with one with D and the other H. Each needs to talk to the device and the other device type out what the person said.
    Don Roihner

    1. Hello, Don!
      Best way in your situation is to use the 'H' app on both devices, the system will work correctly.

  9. Hello Vasily,

    In the text it says that Dutch is also supported as language. I have installed the app on both an iPhone and an IpAd, but it only works (very well) in English.
    What should I do to get the Dutch version working?

  10. This comment has been removed by a blog administrator.

  11. I've paid and downloaded both the D ap and the H ap on my phone and tablet but they're not connected. Both devices show they are paired. How do I get the program to connect?

  12. Hello George!
    You have to press context menu button of your phone/tablet, then Connect button and choose second device from list of paired. Write me directly to

  13. I just recently downloaded the app on my iphone and my ipad. Iphone is running ios10 and ipad is running ios 9.3.

    They won't pair. They find each other but then it just spins and they never make the final connection. I even get the message saying they want to connect, accept or decline. I always say accept. I didn't know if I needed to check something in my settings that may not be allowing them to connect.

    Thanks for your help

    1. Hello!
      Press Accept on the first device and press Done on the second.

      Example how to establish connection here.

  14. Can you use this on 2 different phones like 1 on a IPhone and the other 1 on an Android?

  15. i want to use in a meeting environment and need to stay in "say and send" mode so the device is continuously listening. is there a way to do that?