Speech Recognition

Our demo recognizes speech from microphone. Requires Google Chrome. Press a button and say something. The result will be displayed on the right.


ClueCon 2020 Presentation


Alpha Cephei presented a great talk on FreeSwitch developers conference ClueCon 2020 titled "Open source speech technology in telephony in 2020". You can find the video here.

Updates from Vosk 0.3.7


We are proud to announce some updates to our Vosk platform version 0.3.7

  • Much better accuracy with model rescoring, available for both desktop and server
  • Two new models - Vietnamese and Turkish
  • New model layout which makes model configurable
  • Freeswitch plugin which allows to quickly plug Vosk into telephony applications
  • Availability of the iOS build

Availability of Spanish and Portuguese models


We are happy to announce the availability of Spanish and Portuguese support for Alpha Cephei. Models for mobile API are available on Github. Our engine now supports 7 major languages.

Availability of Chinese models


We are happy to announce the availability of Mandarin Chinese support for Alpha Cephei. Models both for web API and mobile API are available on Github. Try them here.


Smart Home
Many Languages

Smart Home

Manage your home, lights, locks and other devices with simple voice commands

Many Languages

Chinese, Hindi, Spanish, English, Russian, French, German, all major languages of the world


Build intelligent conversational interfaces with your clients using our ASR and NLP technology



Build voice-enabled mobile applications working offline without internet connection, providing security, privacy and smooth fast response experience.


Make natural language orders to our new mates everywhere - at the office, at factory, on space station


Don't distract yourself on the road - manage music and entertainment with voice

Open Source

VOSK is an innovative, next generation open source speech recognition toolkit. It focuses on life-long semi-supervised learning with huge datasets. The idea is to apply audio fingerprinting approach to learn speech sounds as well as other non-speech sounds. We are also considering support for distributed multiparty learning as core feature of the toolkit.

VOSK enables fully offline speech recognition without internet connection and data transfer.

To name few other advantages or our approach: we can quickly train on 100000 hours of speech data, we can correct recognizer behavior just by adding samples. We can also parallelize training across thousands of nodes.

Check Vosk documentation and try it.


Alpha Cephei primary mission is scientific one. We spent more than 10 years researching speech production, speech recognition and all related areas. We have made a significant progress in understanding the nature of such a marvelous communication method as speech.

At the same time we are also the experts in implementation of the state of the art algorithms in practical systems. We excelled our capabilities during numerous projects in many companies around the world.

We hope you'll find our software, our publications and thoughts useful.

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