Linguistic Services


Optimize your language-based AI solutions for a global market



Achieve world-class performance and diversity goals for your language-based AI solutions and expand market coverage with help from Appen’s expert linguists.

Our team will keep you ahead of the curve by using our extensive linguistic knowledge to help you predict, diagnose, and overcome natural language challenges in the development of your speech and text-based communication systems.

Our team’s unparalleled expertise in the analysis and labelling of complex natural language data makes Appen the best partner for your end-to-end AI data development and system evaluation needs in any market.



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Language Technology QA
& Usability Testing



Develop high quality language-based solutions that meet your customers’ needs


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Use Case


As you develop your models and software solutions, you will want to test their performance in real-world situations with linguistically and culturally diverse users. An effective evaluation framework improves your natural language system and ensures a robust product that works for your customers. We can help you measure model success and product satisfaction, giving you the confidence to deploy world-class solutions.

Our Approach


Our expert linguists are trained in experimental design and knowledgeable about testing methodologies. They can work directly with your team to evaluate your product using industry-standard quality metrics and input from users who reflect customers in the real world. Whatever the nature of your language-based system, our team can help you get your solution market-ready with detailed evaluations and recommendations for improvement, ensuring success for your language-based solutions.
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Dictionaries and Text Corpora



Optimize the performance of your speech recognition, text-to-speech, and natural language processing systems


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Use Case


Depending on the type of natural language solution you are building, it can be important to provide a rich lexicon of words as input to your system. By doing so, your system will be able to recognize offensive words, sentiment bearing words, or other keywords that provide the right context for system understanding. Lexicons can also help your speech system correctly recognize and pronounce words for greater accuracy when interacting with your customers.

Our Approach


Our team of lexicographers can build customized pronunciation and part-of-speech dictionaries, specialized wordlists, and annotated text corpora for any language or dialect you require. Work with our experienced linguists, and we’ll help you build a more robust speech or natural-language processing system. We have an extensive range of dictionaries and text corpora available for licensing off-the-shelf.


Off-the-Shelf Datasets
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Localization Consulting



Take your solutions to market on a global scale


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Use Case


Organizations need to ensure that their natural language solutions can be easily adopted into target markets. In order to do that, the language content and dialogue interactions within those solutions must be correctly localized. Our skilled linguists can provide the language-specific and cultural guidance needed to localize your products.

Our Approach


Work with our team of expert linguists to ensure your technology platform or solution works optimally for your target languages. We can ensure your customer interactions are correctly adapted for your solution and market, while customizing a consulting engagement with you based on your business needs.
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Linguistic Consulting



Engage trained linguists to help optimize your natural language systems


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Use Case


Whether you are working on a knowledge graph, a sentiment analysis solution, an interactive voice response system, or another system that relies on understanding speech or text, our professional linguists can help to optimize your system. For example, a well-structured ontology provides a firm, extensible foundation for storing and retrieving knowledge, reasoning over your data, and converting language to meaning; a context-based approach to sentiment provides enhanced differentiation between positive and negative opinions; and a properly organized dialogue tracking system provides a smooth flow of information between your customer and your system. In some cases, you need to create linguistic rules so that your product knows which option to choose in ambiguous situations. A well-thought out, structured foundation will help your system perform at its best.


Our Approach


Our expert linguists can work with your team to understand your unique objectives and help you develop the appropriate datasets, ontologies, grammars, lexicons or rules to improve the accuracy of your language technology solutions and support the needs of your target users or customers.



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Why Appen?



Our team of professional linguists include senior experts with Ph.D. degrees covering a range of specializations, highly technically trained computational linguists, and staff with significant industry experience. We have deep expertise in more than 180 languages and effective tools and processes for generating high quality annotations from our global crowd of over 1 million skilled contractors.

With a 20+ year history of providing expert linguistic services, our team is proud to partner with technology, automotive, financial services, and eCommerce companies—as well as governments worldwide—to help them develop, enhance, and use solutions that rely on natural language processing and machine learning.


Contact Us Today