Amazon Polly
Amazon Polly is a service that turns text into lifelike speech, allowing you to create applications that talk, and build entirely new categories of speech-enabled products. Polly's Text-to-Speech (TTS) service uses advanced deep learning technologies to synthesize natural sounding human speech. With dozens of lifelike voices across a broad set of languages, you can build speech-enabled applications that work in many different countries.
In addition to Standard TTS voices, Amazon Polly offers Neural Text-to-Speech (NTTS) voices that deliver advanced improvements in speech quality through a new machine learning approach. Polly’s Neural TTS technology also supports two speaking styles that allow you to better match the delivery style of the speaker to the application: a Newscaster reading style that is tailored to news narration use cases, and a Conversational speaking style that is ideal for two-way communication like telephony applications.
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Unreal Speech
The most cost-effective, ultra-realistic text-to-speech API. It sounds more natural-sounding audio than AWS Polly, Microsoft Azure, IBM Watson, and Google Wavenet, and it costs 2 to 4 times less. For interactive applications, the API can return audio in 0.5 seconds for up to 45 seconds of audio (500 characters). For long-form applications, it can product up to 10 hours of audio in 15 minutes (500,000 characters).
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Azure Text to Speech
Build apps and services that speak naturally. Differentiate your brand with a customized, realistic voice generator, and access voices with different speaking styles and emotional tones to fit your use case—from text readers and talkers to customer support chatbots. Enable fluid, natural-sounding text to speech that matches the intonation and emotion of human voices. Tune voice output for your scenarios by easily adjusting rate, pitch, pronunciation, pauses, and more. Engage global audiences by using 400 neural voices across 140 languages and variants. Bring your scenarios like text readers and voice-enabled assistants to life with highly expressive and human-like voices. Neural Text to Speech supports several speaking styles including newscast, customer service, shouting, whispering, and emotions like cheerful and sad.
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Google Cloud Text-to-Speech
Convert text into natural-sounding speech using an API powered by Google’s AI technologies. Deploy Google’s groundbreaking technologies to generate speech with humanlike intonation. Built based on DeepMind’s speech synthesis expertise, the API delivers voices that are near human quality. Choose from a set of 220+ voices across 40+ languages and variants, including Mandarin, Hindi, Spanish, Arabic, Russian, and more. Pick the voice that works best for your user and application. Create a unique voice to represent your brand across all your customer touchpoints, instead of using a common voice shared with other organizations. Train a custom voice model using your own audio recordings to create a unique and more natural sounding voice for your organization. You can define and choose the voice profile that suits your organization and quickly adjust to changes in voice needs without needing to record new phrases.
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