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4D for HLT


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A Leader in Artificial Intelligence and Machine Learning Providing Human Language Technology Solutions for the Enterprise

AppTek’s 4D HLT methodology (Language, Emotion, Dialect, Demographic, Domain and Channel) creates AI-powered multidimensional HLT solutions designed to drive high impact results for your business needs at scale with speed and precision. We reduce risk, accelerate business impact and have the expertise and leading scientific methods to make our customers more successful.


Speech Recognition Languages &


Neural Machine Translation 
Language Pairs


Employees with 80% NLP/ML Scientists and
Research Engineers
on Staff


Qualified and Certified Distributed Member Annotation Workforce

Key Industries

Explore how AppTek's 4D solutions unlock value in your industry.


AppTek’s 4D state-of-the-art conversational live automatic transcription and translation technologies bring accessible and equitable communications to deaf and hard of hearing individuals around the globe.  The platform offers unmatched accuracy for multi-lingual conversations combined with user-centric features built in conjunction with experts from Gallaudet University with the goal to welcome users of all hearing abilities into any conversation.


AppTek's custom-tailored 4D AI technologies facilitate driver-car interaction across a diverse set of acoustic environments to keep users in hands-free control of their with accurate voice commands.  AppTek works with manufacturers to get the most from voice assistance technologies through a combination of short form and long form speech.


AppTek’s 4D technology augments human-run banking/finance tasks such as compliance screening and risk management while allowing enterprises to leverage critical business intelligence aggregated within agent/customer interactions to to better inform the enterprise.  AppTek’s 4D technologies are also used to assist with self-service systems and chatbots to optimize the customer experience across a multitude of languages.

Contact Center

AppTek’s 4D technology empowers contact centers with the technology needed to more accurately mine omni-channel interactions for enterprise intelligence.  4D technologies enable call center managers to gauge sentiment, understand agent performance and needs, drive escalating trends and topics to management, note changes in customer emotion and behaviors and reduce risk for churn.  Additionally, 4D technologies optimize inbound and outbound interactions through more user-friendly and intuitive IVR, chatbots and other self-serve systems.


Our 4D technology better enables self-serve communications platform for intuitive and proactive customer engagement in the energy sector while controlling costs and keeping companies compliant within strict PUC regulations. The 4D platform transforms massive repositories of multimodal content such as conversational data and incident reports into discoverable and actionable intelligence designed to better support enterprise decision making.


AppTek’s 4D Technologies support healthcare professionals with an accurate solution for gathering clinical intelligence within multilingual patient/care-worker interactions.  The technologies are used to advance the quality of the patient experience with self-serve and real-time multilingual communications.  Additionally, AppTek scientists have worked with doctors on clinical trials that seek to gather digital biomarkers from speech and voice analysis including Alzheimers and Covid detection.


AppTek’s 4D technologies optimize productivity, improve customer interaction and engagement, and create higher win rates for contracts in the insurance sector while mitigating churn.  Reduce claim leakage through higher accuracy transcriptions and entity extractions that bring critical elements related to each claim to the forefront while also accelerating risk assessment and fraud identification by taking all the facets of language, spoken and unspoken, into consideration.

Media and Entertainment

From live automated captioning to subtitling and dubbing to making media asset archives more discoverable, AppTek’s 4D technologies empower media and entertainment professionals with the most powerful AI-enabled captioning, subtitling and dubbing tools on the market to accelerate high quality workflows and more rapidly localize content for global distribution. AppTek’s customizable 4D solutions deliver new efficiencies custom-tailored to existing assets while monetizing the value of new and archived content.

Retail and Consumer

AppTek’s 4D technology helps retail brands improve sales, enhance interactions, reduce customer friction and increase overall satisfaction through the use of multimodal human language technologies.  Whether you want to power a new AI-enabled e-commerce digital voice assistant for better customer-to-brand interactions, translate and localize e-commerce content to roll your products to a global audience, or mine customer conversations for trends, ideas and opportunities to improve your brand, AppTek offers a scalable solution no matter the scope of your project.

Applied Solutions

Discover AppTek's neural AI/ML powered 4D modeling solutions custom-tailored to meet your needs.

Automatic Dubbing

AppTek’s cutting-edge automatic dubbing technologies provide accurate automatic speech recognition (ASR) cascaded and timed-encoded with neural machine translation (NMT) and adaptive text-to-speech TTS technologies, while automatically taking into account voice print, prosody, and volume-emotion for natural-sounding speech, for complete end-to-end automatic dubbing workflows.

Automatic Transcripton

AppTek’s AI/ML expertise applied to advanced automatic speech recognition (ASR) technology delivers the highest accuracy for automatic speech-to-text transcriptions across a wide range of languages, dialects, domains, audio bands and acoustic environments for both short-form and long-form continuous speech tasks.  We offer our own technology and models but also work with existing ASR providers to improve their performance.

Automatic Neural Translation

AppTek’s AI/ML expertise applied to neural machine translation (NMT) technology offers fast, scalable, and high-quality translations across multiple language pairs with models trained on large amounts of public and proprietary data and covering a wide range of data types and domains. AppTek’s NMT can be deployed for low-resource languages along with customized systems that take advantage of the multidimensional metadata in the NMT system to produce custom tailored outputs (ie genre, formal/informal, domain, dialect) and a single system capable of multiple domains and genres.

Demographic Optimization

AppTek’s comprehensive multilingual HLT models cover a diverse set of multidimensional domains covering an even more diverse set of demographics including gender (male/female), age (children, middle age, elderly), race (African American, Hispanic, Caucasian) , region (Northern dialects,  Southern dialects), education (high school, graduate), and other demographic profiles designed to boost accuracy and reduce bias.

Language Identification

AppTek’s Language Identification (LID) technology automatically identifies source languages of unknown content from audio such as media archives, phone calls, social media and other content to produce time-synched metadata by language.  Additionally, AppTek offers identifies languages within large amounts of text found in sources such as online forums, e-mails, customer reviews, etc.

Natural Language Understanding

AppTek’s natural language understanding (NLU) technology seamlessly identifies valuable context and “meaning” from documents, recordings or conversations, and relates named entities, intent, modalities and objects together to build a knowledge graph which evolves over time in order to extract valuable and actionable information for deeper contextual analysis. AppTek’s NLU technologies can be utilized for sentiment analysis, automated reasoning, text classification, voice-activation and content analysis with the overall goal to provide deeper insights inside virtually any cluster of text.


AppTek’s HLT technologies mask sensitive personally identifiable information (PII) from documents and transcriptions including bank account numbers, credit card numbers, email addresses, phone numbers social security numbers and mailing addresses.

Sentiment/Emotion Analysis

Extract the overall opinion, attitude, polarization or feeling over a specific topic, product or category for deeper analysis of sentiment across large clusters of text.  Identify emotional cues from from multimodal text and changes in prosody offered in audio to provide even deeper insights.

Speech Synthesis

AppTek's text-to-speech (TTS) services provide high quality lifelike synthesized speech that can be used for interactive agents, offline dubbing and real-time speech generation.  Advanced customization allows for the adaption of speech to a pre-selected desired voice, or create a custom voice print from an existing voice actor.

Custom Deployment

AppTek's 4D technology includes robust customization and deployment options for any project.

Acoustic Model Adaptation

While our general model acoustic profiles are continuously adapted to work well across a large variety of situations and audio characteristics,  AppTek's scientists can adapt models further to account for unique acoustic environments such as instances where there are poor audio inputs (low microphone quality), atypical speech patterns such as slow/fast talkers or speakers with pronounced non-native accents, multi-array microphones, noisy environments such as construction zones, and more.

Captioning Appliance

Apptek’s industry-leading automatic speech recognition (ASR) technology is available via an on-premise appliance which can reside on a broadcasters premises sitting between a digital/analog audio input and closed captioning encoder to deliver same language automatic captions for accessibility without any need to connect to the cloud.

Cloud Deployment

AppTek’s cloud services offer customers with developer-friendly 24/7 API access to our speech and language models with a wide array of tools to further extract and enhance results.   The platform supports advanced features including lattice output, lexicon customization and produces results in popular outputs such as SRT, XML, JSON, and others.

Data Bias Correction

AppTek’s Data Services team works hand-in-hand with speech technology scientists to create bias-corrected data for our global language models that takes into account demographic, race, age, education level and a variety of other factors to ensure higher performance.  We work diligently to reduce propensity for bias on all of our models.

End-to-End Modeling

As a leader in the full stack of speech and language technologies including automatic speech recognition, neural machine translation, natural language understanding / processing and neural speech synthesis, AppTek can chain these multiple technologies together for a complete end-to-end speech-to-speech multilingual translation solution.

Language Model Adaptation

AppTek can adopt its lexicon for customized language models to more accurately transcribe uncommon words, phrases and strings based on a unique vocabulary and domain.  Language model adaptation can include adding new words to the vocabulary such as proper names, street names, etc, or to better expose the language models to common phrases within a domain (for example a financial source may have 'shorting Apple" versus a cooking show source "cutting apple".)

Multimodal Data Labeling

AppTek's team of scientific experts works in tandem with our global annotation workforce to create, collect, classify, and tag real-world domain-specific conversations across a wide range of languages/dialects and demographics to fuel better new AI-enabled customer experiences at scale.  We deliver scientifically tested and quality-assured speech, text and video acoustic, language ad media packs to meet any custom project requiring the use of premium data.

On-Premise Deployment

AppTek’s language models are available for on-premise deployment within an easy-to-deploy docker container that supports both synchronous and asynchronous streaming.  Pre-built code in multiple frameworks offers developers a quick jumpstart to get instantly moving on premise.

Output Customization

AppTek delivers a wide range of features for output and readability, such as Intelligent Line Segmentation for subtitle files in the media and entertainment iIndustry, whereby line breaks are created based on syntax and semantics. rather than the traditional approach of speaker pauses, for more readable user-friendly subtitles.  No matter your need, we can work to build you a custom solution.

Languages and Domains

AppTek's 4D technology accelerates performance for high impact enterprise applications.
  • Afrikaans
  • Arabic (13 Dialects)
  • Bengali
  • Bulgarian
  • Chinese (3 Dialects)
  • Czech
  • Danish
  • Dari
  • Dutch
  • English (14 Dialects)
  • Estonian
  • Farsi
  • Finnish
  • French (2 Dialects)
  • German (2 Dialects)
  • Greek
  • Hebrew
  • Hindi
  • Hungarian
  • Indonesian
  • Italian
  • Japanese
  • Kannada
  • Korean
  • Latvian
  • Lithuanian
  • Malay
  • Maltese
  • Marathi
  • Norwegian
  • Pashto
  • Persian
  • Polish
  • Portuguese (2 Dialects)
  • Romanian
  • Russian
  • Slovak
  • Slovenian
  • Spanish (7 Dialects)
  • Swedish
  • Tagalog
  • Tamil
  • Thai
  • Turkish
  • Ukrainian
  • Urdu
  • Vietnamese
  • Agriculture
  • Automotive
  • Chemistry
  • Clothing
  • Communication
  • Construction
  • Education
  • Enterprise Management
  • Entertainment
  • Finance
  • Food
  • Furniture
  • Government/Lobbying
  • Healthcare
  • High Tech
  • Human Resources
  • Insurance
  • Legal
  • Logistics
  • Marine/Watermotive
  • Market Research
  • Marketing
  • Mechanical Engineering
  • Packaging
  • Real Estate
  • Sales
  • Security/Validation
  • Sports
  • Technology
  • Travel
  • Utilities
  • Veterinary
  • 3D Modeling
  • Access Management
  • Account Based  Marketing
  • Accounting
  • Advertising
  • Analytics
  • Automotive
  • Benefits
  • Booking
  • Brokerage
  • Call Management
  • Cash Provision Services
  • Coating
  • Cold Calls
  • Communications
  • Consulting
  • Consumer Programs
  • Credit Reporting
  • Data Management
  • Data Services
  • Device Management
  • Distribution
  • E-Discovery
  • E-Learning
  • Education
  • ERP
  • Financial
  • Healthcare
  • HR Analysis
  • HVAC
  • Infrastructure
  • Invesments
  • Lead Generation
  • Lending
  • Lobbying
  • Manufacturing
  • Meeting Scheduling
  • Outsourcing
  • Payments
  • Pharmaceuticals
  • Process Management
  • Real Estate
  • Recruting
  • Sales Automation
  • Science Lessons
  • Security
  • Self-Service
  • SEO Optimization
  • Software Development
  • Supply Chain Management
  • Travel Offers
  • Telecommunications
  • Utilities
  • Workforce Management
  • Veterinary

Need a Language Technology Solution? Contact AppTek today!

No matter the industry or application, AppTek's advanced artificial intelligence, deep neural network and machine learning-bases speech and language technologies can deliver superior enterprise-ready results with full customization tailored towards your needs.  Contact us to learn more today.

30-Year Leaders in Speech Technology
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