6 Best Audio Labeling Services

Article by Limarc Ambalina | May 24, 2019

Why is Audio Annotation useful?

Within the machine learning industry, one in-demand service is audio annotation, also known as audio labeling. As an example, one major area of AI development that requires audio training data is speech recognition. There are many applications of speech recognition such as virtual assistants, speech to text programs, chatbots, and more.


Where can I find Audio Labeling Services?

High-quality voice and sound data for AI development can be difficult to find. If you’re looking for labeled audio data for machine learning, here are 6 audio labeling services:


  1. Alegion

Located in the United States, Alegion specializes in AI training data for computer vision, natural language processing, and entity resolution. Utilizing Alegion’s proprietary platform, your data is annotated by Alegion’s trained staff, your own supplied crowd, or a mix of both. Alegion provides a variety of text and audio labeling services including sentiment analysis, chatbots, intent recognition, and information extraction.

  1. Lionbridge AI

With a curated crowd of over 500,000 workers fluent in over 300 languages, Lionbridge AI is your go-to source for custom AI training data. Specializing in linguistics, with over 20 years of industry experience, Lionbridge can provide data creation, annotation, and validation services in a variety of languages and fields. The company offers numerous audio labeling services including audio transcription, speaker annotation, audio descriptions, audio speech analysis, and phonetic transcription. They can also build custom workflows to cater to your specific project needs and requirements. Lionbridge can handle projects both large and small, with strict attention to encrypting and securing your confidential data.

  1. Appen

A trusted company in the AI training data market, Appen is headquartered in Australia and has numerous offices worldwide. From linguistics and search relevance to data annotation and data collection, Appen provides a variety of machine learning data services. Some of their audio annotation services include speech data collection and transcription.

  1. Figure Eight

Acquired by Appen earlier this year, Figure Eight is a human-in-the-loop machine learning platform and provider of numerous forms of AI training data. With a wide range of use cases including autonomous vehicles, natural language processing, intelligent chatbots, and more, Figure Eight provides numerous data annotation services. Their audio labeling services include audio transcription and audio utterance collection.

  1. Amazon Transcribe

Unlike the previous items on this list, Amazon Transcribe is an automatic speech recognition service with no human annotators. As the name suggests, Amazon Transcribe is a specialized audio labeling service which solely offers automated audio transcription.

  1. Stardust

Based in Beijing, China, Stardust is a provider of computer vision, audio, and text data for machine learning. Utilizing crowdsourced workers, Stardust matches qualified workers to your project and trains them to meet your project needs. The company provides a wide range of computer vision services as well as audio transcription.


If you’re looking for voice and sound data not mentioned on this list, get in touch with our sales team to help you find what you need. At Lionbridge AI, we can use our 20+ years of experience and crowd of over 500,000 workers to provide you with custom AI training data to fit your unique project needs.

Interested? Get high-quality data now
The Author
Limarc Ambalina

Limarc writes content for Lionbridge’s website as part of the marketing team. Born and raised in Canada, Limarc’s love of Japanese pop culture brought him to Japan in 2016 and living in Japan has been his dream come true. Apart from Lionbridge content, you can catch Limarc online writing about anime, video games, and other nerd culture.


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