Automatic Speech Recognition (ASR) that works offline

Our professional Software Development Kit (SDK) to simply voice-enable products and services with bespoke understanding of any complex vocabulary.

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Getting familiar with the technology

Automatic Speech Recognition, often referred to as Speech-to-Text or simply Speech Recognition, is the main technology that makes voice a way to interact.

At the pinnacle of voice AI, it merges together complex solutions such as acoustic models, natural language understanding (NLU) or audio signal processing.

This technical stack allows ASR to turn human speech into normalized data (text, intent, values…) that can be processed by complex systems.

Use cases and existing applications

How to leverage ASR in the field?


  • Voice-enabled AR glasses
  • VR voice typing
  • Voice control in headphones

Industry 4.0

  • Voice picking
  • Field report dictation
  • Voice-enabled quality control


  • Smart fridge, oven etc…
  • Hands-free Industrial appliance
  • Custom/branded voice assistant

Field services

  • Maintenance assistant
  • Voice reporting
  • Voice assisted workforce


  • Voice-enabled robotics
  • Hands-free medical tools
  • Human-Machine Interface


  • Hands-free military equipment
  • Voice-based training solutions
  • Specific MRO workflows


How to use offline Automatic Speech Recognition

Grammar-based Recognition

Grammar-based recognition is a technology used to create the most accurate and reliable voice commands. Closely related to Voice Dictation, it takes the solution further with specific intent comprehension thanks to its design relying on grammar creation.

Voice Dictation (FreeSpeech)

Voice dictation is based on deep learning language models, that are used to transform audio signals into transcribed text. The results are statistically determined regarding the most frequent sentence structures and word occurrence regarding the context identified.


Why should you choose our 
Automatic Speech Recognition?

Internet Independent

No wifi or network are required to perform advanced speech recognition.

Superior Accuracy

Across different environments, user population or vocabulary complexity.

Data Privacy

User data stay in the device, unexposed to security issues and transfers.

Real-time Processing

Speech processing directly on the device reduces latency to 0.

Clear Pricing

Business models that adapt to yours, without any hidden-fees.


Simple to develop and embed across all platforms (windows, linux, android…).

Adopting voice solutions in your business starts here

Get in touch with our team to shift your company in the Voice First world! Or try it now!

Companies that have chosen our solution

Our customers' feedbacks regarding our solutions

“Vivoka’s technologies have been integrated into our solutions dedicated to Human Factors in industry, guaranteeing performance and data confidentiality.”

Guillaume Jégou

Head of the Human Factors Technology Laboratory

"Vivoka’s solutions can run offline, on-device, to operate anywhere, anytime and with a broad language support capability which is for our products a distinct competitive advantage."

Paul Travers

Chief Executive Officer (CEO)

zorabots logo

"We partnered with Vivoka on several innovative projects on embedded Linux system, and delivered, in a very short time, multi-lingual natural voice interactions fully running “at the edge” to our customers."

Cédric Vincent

VP of Technology

For developers, by developers

Try our voice solutions now


Sign up first on the Console

Before integrating with VDK, test our online playground: Vivoka Console.


Develop and test your use cases

Design, create and try all of your features.


Submit your project

Share your project and talk about it with our expert for real integration.

Requirements & Quick-Start

How to develop with our ASR engine?

– On the Device

Fully-embedded voice technology for brands seeking the convenience of a voice user interface without the privacy or connectivity concerns of the internet. Full access to custom commands and the ability to instantly update command codes during development make voice-enabling your product fast and easy.

– On Premise

Get the power of cloud connectivity combined with the reliability of embedded voice technology. On premise (or hybrid) solutions ensure that your device is always-on and responsive to commands. Seamlessly push product updates and deliver a broader voice experience with the level of cloud-connectivity that best matches your product and users.

The ASR we provide are grammar-based recognition engines. It means the recognition’s capabilities are based on a file that includes the different elements to be recognized (numbers, sentences, words, names…). 

Our offline Automatic Speech Recognition supports both phonetic edition (changing the way words are understood by the engine) and dynamic data (having flexibility with the grammar content).

The engine currently supports 41 languages.

– Model & Resource Size: 6 to 15MB

– SDK Code Size: 10 to 65MB

– Supported Hardware: Microprocessor Units

– Supported Platforms:

  • Windows – x86_64
  • Linux – x86_64 | armv7hf | armv8
  • Android 6.0 (API 23)

Complementary Technologies

Discover other technologies in our stack

Wake Word

Trigger speech recognition process by detecting a unique word or sentence.

Voice Biometrics

Seamlessly identify or authenticate users by recognizing their voice pattern.


Automatically generate life-like voices from text data in multiple languages and aspects.

Audio Enhancement

Enhance the audio signal quality from voice to boost speech recognition’s accuracy.

It's always the right time to learn more about voice technologies and their applications