
Deepgram
Speechmatics
Yack.net
Spok Speech Solutions
LumenVox ASR
Hidden Markov Model Toolkit
Vox Neural
Sensory provides accurate, low-cost embedded voice and biometric AI. Sensory’s technologies have shipped in over a billion units of consumer products.

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When comparing Sensory and Opalstack, you can also consider the following products.


The most accurate and inclusive speech-to-text API ever released.
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Recorded and transcribed calls for team collaboration
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Spok Speech Solutions allows organization to process routine phone requests such as transfers, directory assistance, messaging, and paging without live operators, letting to manage call volumes, operator workloads, and keeping calls from dropping.
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LumenVox Automated Speech Recognizer (ASR) is a software solution that converts spoken audio into text, providing users with a more efficient means of input.
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Hidden Markov Model Toolkit (HTK) is a portable toolkit used for speech recognition research, speech synthesis, character recognition and DNA sequencing.
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