Use Case

Voice & Speech

Speech-to-text, text-to-speech, and voice interfaces.

22 providers 100 APIs 19 declared variants

Transcribing audio, synthesizing speech, and building voice-driven experiences into phone systems, assistants, chatbots, and applications.

22 API providers on the APIs.io network offer voice & speech. The highest-rated are Amazon Polly, OpenAI, Amazon Mechanical Turk, WhatsApp, Wolfram Alpha.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Strong 4 Solid coverage with minor gaps
Amazon Polly Amazon Polly is a cloud service that converts text into lifelike speech, enabling you to create application... 1 API 68.2 OpenAI APIs for accessing OpenAI's artificial intelligence models including GPT, DALL-E, Whisper, and Embeddings. 25 APIs 67.0 Amazon Mechanical Turk Amazon Mechanical Turk (MTurk) is a crowdsourcing marketplace that makes it easier for individuals and busi... 1 API 65.7 WhatsApp APIs for the WhatsApp messaging platform, enabling businesses to communicate with customers through the wor... 4 APIs 61.3
Developing 13 Usable, with meaningful gaps to close
Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 6 APIs 59.3 Amadeus Reservations Amadeus Reservations provides APIs for creating and managing travel bookings including flight orders, hotel... 5 APIs 58.9 AssemblyAI Built by AI experts, AssemblyAI's Speech AI models include accurate speech-to-text for voice data (such as ... 1 API 56.7 Abortion Policy API The Abortion Policy API provides up-to-date information on US state abortion policies that can be integrate... 1 API 55.6 AIMLAPI AIMLAPI is a unified AI model API gateway providing access to 400+ state-of-the-art AI models from OpenAI, ... 1 API 54.6 Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 5 APIs 54.0 Words API Words API is a RESTful English-language API that provides definitions, synonyms, antonyms, related words, s... 1 API 52.6 Apache OpenWhisk Apache OpenWhisk is an open-source serverless cloud platform that executes functions in response to events ... 1 API 52.0 Apache OpenNLP Apache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports... 1 API 50.9 S&P Global S&P Global (NYSE SPGI) is the parent of S&P Global Ratings, S&P Global Market Intelligence, S&P Dow Jones I... 9 APIs 49.5 Amazon Nova Amazon Nova is a new generation of state-of-the-art foundation models from Amazon that deliver a compelling... 1 API 46.8 Edamam Edamam is a food and nutrition data platform powering recipe search, NLP-based nutrition analysis, food dat... 4 APIs 45.9 Gemini Google's Gemini API provides access to state-of-the-art generative AI models for text generation, multimoda... 16 APIs 45.6
Thin 5 Limited public surface area
IMDb-API Community web service (operated under the IMDb-API / TV-API brand) providing movie, TV series and cast info... 1 API 43.8 Ron Swanson Quotes A community-built, open source HTTP API that returns Ron Swanson quotes from the NBC television series Park... 1 API 38.2 Shelf.io Shelf.io is the first knowledge automation platform and next-generation AI agentic platform for knowledge m... 3 APIs 38.0 Agora Agora is a real-time engagement platform providing ultra-low latency voice, video, signaling, chat, interac... 11 APIs 37.6 Quote Garden Quote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathames... 1 API 32.0

What Providers Actually Declared

This use case is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

AI Chatbot DevelopmentAI Chatbot GroundingAI-Powered ChatbotsChatbot AnswersChatbot DevelopmentChatbot IntegrationChatbot and Voice Assistant PromptsChatbots & WebhooksChatbots and Conversational AgentsChatbots and VoiceConversational AIConversational AI Voice AgentsEarnings Call TranscriptionEntertainment chatbotsTranscription ServicesTravel ChatbotVoice Application DevelopmentVoice Assistant SkillVoice Assistants

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