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ReadSpeaker speechEngine SDK

Give your content and applications a natural voice.

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Whether you’re developing new corporate e-learning software or taking an online banking system to the next level to boost end-user satisfaction, choose ReadSpeaker TTS voices to delight your customers.

ReadSpeaker speechEngine SDK allows you to easily build and seamlessly integrate our high-quality synthetic voices into your desktop applications.

Whether it’s an e-learning application, announcement and notification system, or a set of audio books – in fact, whatever application you’re working on, our text to speech voices are ready to satisfy the most demanding requirements.


Exceptional performance from natural-sounding voices

ReadSpeaker synthetic voices are extremely accurate, clear and natural, and ready to express your content intelligently. Optimized for your specific platform, they’re designed to deliver the highest quality sound and exceptional performance every time. Communication has never been easier or more effective.

A world-class family of voices

Engage customers across the globe by speaking their language. Today,ReadSpeaker gives your content a voice in 20+ languages and 70+ voices —and more languages are on their way.

Customizable dictionary for greater accuracy

ReadSpeaker voices come with a pronunciation dictionary that covers most of a language’s pronunciations. However, there are always exceptions and sometimes you need to add regional dialect variations and expand the standard lexicon. Fine tune pronunciation, manage acronyms, get the nuances of names of people and locations just right. Add technical words that are specific to your business or industry. Whether you’re adding a list of medical terms or a newly coined slang word, it’s easy using the phonetic alphabets we support. These include IPA, X-Sampa, TeleAtlas Sampa, Navteq Sampa, X-Sapi, X-CMU, X-PENTAX, X-PINYIN, X-WORLDBET. Phonetic transcription standards may differ between different voices.

Create engaging content communicated in your voice

Effortlessly produce your voice content, and tweak it to fit your application perfectly, controlling speed, pitch, volume, etc

Flexible footprint

From ~ 7 MB to 600 MB per voice – the choice is yours, depending on whether you need the highest definition voice for your contact center or something lighter, ReadSpeaker delivers according to your needs.

A variety of audio formats and sampling rates

We support the following audio formats and sampling rates: PCM, Wav, Ogg and MP3* (*using third party library) – 8 KHz, 11 KHz, 16 KHz, 22 KHz, 44,1 KHz. Sampling depth 16 bit.

Operating System and API Compatibility

Have it your way—Windows or Linux. Pick your operating system of choice and create your application using C-based APIs.

System requirements


Windows & Linux


Intel x86/64
1 GHz or higher


6-30 MB

Voice Footprint

7 MB to 600 MB per voice



Make communication easier for people with speech disorders, vision impairments and dyslexia. Provide assistive text to voice applications and improve daily life for millions of users. Online services should also be accessible to user groups who tend not to be as computer proficient.

Announcement Systems

Whether it’s to update passengers about a delayed flight at the airport or to give visitors information about a famous monument, interactive audio kiosks are a great way to provide information.

Audio Publishing

Make your content accessible to everybody. Enable drivers to listen to it on a reading app on their way home. Let your readers stay up to date on the news as they train for their next marathon. Above all, let everyone who has difficulty reading enjoy the power of text to voice.


Improve learning outcomes – speech enable your content for e-learning, professional simulation, induction training, etc.

Electronic Gaming

Immerse gamers in audio-driven storytelling. Assist players struggling with the game using voice prompts that activate over a hotspot. Delight kids with a talking robot.


Deploy voice announcements in trains, buses, airports, at stops or on platforms to keep passengers updated on ETAs, delays and departures, next stops, etc.

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