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Give your mobile app a voice™

Spokestack is a powerful platform of open source libraries and robust services to make your app fully voice-enabled.

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Today's consumers want to speak to their products and services.

Over 58% of Americans use their phone as a voice assistant*. That’s more users than those of smart speaker, smart watch and desktop voice assistants combined. As Airpods™ and other voice assistant-powered headphones gain popularity, users will expect apps to have a voice and provide a hands-free experience.

23% Smart Speakers

45% Cars

58% Smartphones

U.S. Assistant Use by Device *

*Source: voicebot.ai

Products & Services

Spokestack ASR and VAD

A one-stop shop for Automatic Speech Recognition (ASR) and Voice Activity Detection (VAD)

Easily add ASR and VAD to your app with one of our open source libraries. Spokestack ASR and VAD allow you to turn user utterances into text, which is the first step to responding to a user. From there, use Spokestack Wakeword, TTS, and NLU to complete the voice experience.

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Spokestack Wakeword

Choose the keyword that will be the wakeword for your app.

Use your brand name or any keyword of your choice to put your app into listen mode, also with the help of one of the Spokestack libraries. Like “Siri”, “OK Google”, or “Alexa”, your app will respond to your wakeword while it is open.

Email us for details on getting a custom wakeword

Spokestack TTS

Create a custom voice for your brand.

Get a custom voice or use the default voice for free. Respond to your users with our proprietary Text-to-Speech (TTS) service.

Our TTS engine can create a custom voice for your brand with as little as five minutes of recordings. We can also work with your own voice talent in a professional recording studio to produce a high quality branded voice for your app.

Email us for details on getting a custom branded voice

Try some of our voice samples below. Each voice is generated using different recording times and methods.

Sample a Custom Voice

Enter what you want Spokestack to say below. Use {{ }} to bracket your IPA.

Spokestack NLU

Keep your data and customer conversations in your app where it belongs with our Natural Language Understanding (NLU) engine.

Use the Spokestack NLU engine to communicate the unique requests, context and pronunciations of words that matter to you and users. Combined with Spokestack TTS, Spokestack NLU helps create a voice-enabled user experience optimized for your brand.

Email us for details on getting a custom NLU for your app

Why Choose Spokestack?

Spokestack ASR and VAD

  • One-stop shop for adding ASR and VAD to your mobile apps

  • Easily add Text-to-Speech (TTS) and a wakeword to your app with Spokestack or other providers, such as Siri, Google Assistant, or Alexa

Spokestack TTS

  • Hand off model training and prosody

  • Fast, built to deliver responses at real time

  • Know exactly what your customers are saying without an intermediary

Spokestack Wakeword

  • Add a custom wakeword that suits your brand without training a Machine Learning model on your own

Spokestack NLU

  • A cross-platform NLU built for multimodal management and consistency throughout the user experience