Text-to-Speech (TTS) API, also known as Speech Synthesis, allows users to convert written text into spoken words. It takes in text input and converts it into audible speech output in various languages and accents.
This technology can be useful for a wide range of applications, including personal assistants, navigation systems, e-learning platforms, and accessibility tools for the visually impaired or those with reading difficulties.
You can use Text-to-Speech in numerous fields, here are some examples of common use cases:
While comparing Text-to-Speech APIs, it is crucial to consider different aspects, among others, cost security and privacy. Text-to-Speech experts at Eden AI tested, compared, and used many TTS APIs of the market. Here are some actors that perform well (in alphabetical order):
AWS offers a robust TTS API called Amazon Polly, which lets users customize speech output and create personalized voices using lexicons and Speech Synthesis Markup Language (SSML) tags. Amazon Polly allows for speech to be stored and shared in standard formats such as MP3 and OGG, while providing realistic voices and fast response times.
AWS’s TTS has the ability to generate speech in different languages, making it a highly versatile and useful tool for businesses and individuals with global communication requirements. Users can also adjust the speaking style, speech rate, pitch, and loudness of the generated speech, allowing for even greater customization and flexibility.
Colossyan's API provides a Text-to-Speech converter that allows users to create natural-sounding voice-overs in more than 70 languages and accents. With Colossyan, users can choose from a variety of voice-over actors or even clone their own voice for an added personal touch.
Colossyan's voices are constantly being updated and added, providing a range of accents within the same language. Additionally, the API eliminates the need for microphones and sound equipment by providing crystal-clear generated audio.
Descript's TTS API - Overdub - provides ultra-realistic voices by utilizing the Lyrebird AI, which achieves a state-of-the-art level in voice synthesis. Overdub stands out for its ability to mimic the nuances and intonations of human speech, allowing it to blend in seamlessly with natural audio recordings while matching the tonal characteristics on both sides. Multiple voices can be created to fit any performance style or setting. The API even makes correcting recordings as simple as typing.
Google Cloud provides a powerful TTS API that is built on the foundation of DeepMind's speech synthesis expertise, generating speech that is near-human quality with natural intonation. Featuring a vast selection of 380+ voices across 50+ languages and variants, users can choose the best voice that suits their needs. Furthermore, Google Cloud's API allows users to create a unique voice that can represent their brand across all customer touchpoints.
The API offers Neural2 and Studio voices features, allowing internationalization and professional narration with studio-quality material. Users can train custom voice models, adjust pitch, speaking rate, and use SSML tags for speech customization.
IBM Watson's service is capable of providing real-time speech synthesis in multiple languages using advanced AI and Machine Learning technologies, enabling users to interact with customers in their native tongue. Additionally, IBM offers users the option to create a unique and branded voice through its Premium service, which can enhance a brand's identity and improve customer engagement.
IBM's technology is now available as a containerized software library designed for IBM partners, making it easier to integrate best-in-class AI speech technology into new or existing applications.
Lovo offers a high-quality AI voice generator called Genny. One of its most impressive features is Emotional Voices, which can express up to 25 emotions, adding depth and realism to any content, which in turn makes it more engaging and memorable. The platform also provides a one-stop-shop for video dubbing, allowing users to easily add sound effects and background music to their videos.
For professional producers, Genny offers granular control with the ability to finetune pitch at every phoneme level, add emphasis to words, and adjust pauses in between words or sentences. Lovo’s AI voices also provide superior realness and quality, with the world's largest library of voices (over 400+ voices with various styles, available in 100 languages).
Microsoft Azure provides a powerful Text to Speech API that enables users to create lifelike synthesized speech with intonation and emotion that matches human voices. Users can create a unique AI voice generator that reflects their brand's identity with Azure. Additionally, the audio controls feature make it easy to tune voice output for specific scenarios by adjusting rate, pitch, pronunciation, pauses, and more. Azure also offers flexible deployment options, allowing users to run TTS in the cloud, on-premises, or at the edge in containers. Finally, Azure's API has the ability to tailor speech output with lexicons and SSML, as well as the option to build custom voices with the Custom Neural Voice capability.
Murf.ai offers realistic AI voices, providing professional voice-over for videos and presentations. Their selection of human-like AI voices in 20 languages is quality checked across dozens of parameters to avoid robotic-sounding voices. Users can choose from multiple accents and can customize their voice-overs using features such as pitch, pauses, and pronunciation to make them sound the way they want.
Play.ht offers an online Text-to-Speech API that converts text into natural-sounding speech with support for 142 languages and accents worldwide. With this technology, users can easily download files in MP3 or WAV format. The platform is easy-to-use, as the entire process requires no technical knowledge. Additionally, Play.ht offers a wide range of AI voices to choose from, ensuring that the generated speech fits users' specific needs.
ReadSpeaker is known as a leading provider in TTS. With over 20 years of experience in voice technology, ReadSpeaker offers a wide selection of languages and voices to generate speech in various accents. The company uses industry-leading technology that incorporates next-generation Deep Neural Network (DNN) to produce some of the most natural-sounding synthesized voices on the market.
Resemble AI provides a cutting-edge API that enables users to create human-like voice-overs in just a matter of seconds. Their extensive library of AI voices set them appart from other APIs on the market, with over 200 000 unique voices.
With Resemble AI's TTS, users can add an infinite amount of emotions to their voices without any new data required. They can also transform their voice into the target voice with real-time, realistic speech-to-speech technology that offers granular control over every inflection and intonation. Resemble AI's solution also makes it possible to convert your voice into any language without providing any data, allowing you to reach a global audience with ease. Additionally, the technology enables users to blend human and synthetic voices for a seamless experience.
Speechify reads various content types like web pages, documents, PDFs, and emails. Users can simply drag and drop or take photos of pages to convert text to speech. The API has the ability to change the language and accent of the voiceover, as well as to adjust the reading speed, making it an excellent choice for individuals who require specific accents or who prefer to listen to content at a specific speed. Currently, Speechify provides TTS voices in over 30 different languages, with a wide range of accents available. Furthermore, the platform offers a browser extension that enables users to read aloud any web page.
For all companies who use Text-to-Speech in their software: cost and performance are real concerns. The TTS market is quite dense and all those providers have their benefits and weaknesses.
Text-to-Speech APIs can perform differently depending on the language being used. Some providers specialize in specific languages and dialects, while others have a broader range of language options. Different specificities exist:
TTS APIs' accuracy can vary based on the quality of the input data, such as punctuation, capitalization, and formatting.
Some TTS APIs are trained with domain-specific data, such as medical or automotive fields, which means that they perform better for specific applications in those fields. If you have customers coming from different fields, you must consider this detail and optimize your choice.
Companies and developers from a wide range of industries (Social Media, Retail, Health, Finances, Law, etc.) use Eden AI’s unique API to easily integrate TTS tasks in their cloud-based applications, without having to build their own solutions.
Eden AI offers multiple AI APIs on its platform amongst several technologies: Data Parsing, Language Detection, Sentiment Analysis, Logo Detection, Question Answering, Data Anonymization, Speech Recognition, and so forth.
We want our users to have access to multiple Text-to-Speech engines and manage them in one place so they can reach high performance, optimize cost and cover all their needs. There are many reasons for using multiple APIs:
Eden AI is the future of AI usage in companies: our app allows you to call multiple AI APIs.
You can see Eden AI documentation here.
The Eden AI team can help you with your Text-to-Speech integration project. This can be done by :
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