Use Case

Voice & Speech

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

23 providers 228 APIs 20 declared variants

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

23 API providers on the APIs.io network offer voice & speech. The highest-rated are OpenAI, S&P Global, Amazon Polly, WhatsApp, Amazon Mechanical Turk.

Providers

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

Exemplar 3 Complete, well-documented, and agent-ready
OpenAI APIs for accessing OpenAI's artificial intelligence models including GPT, DALL-E, Whisper, and Embeddings. 51 APIs 69.0 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 69.0 Amazon Polly Amazon Polly is a cloud service that converts text into lifelike speech, enabling you to create application... 5 APIs 66.1
Strong 4 Solid coverage with minor gaps
WhatsApp APIs for the WhatsApp messaging platform, enabling businesses to communicate with customers through the wor... 17 APIs 64.5 Amazon Mechanical Turk Amazon Mechanical Turk (MTurk) is a crowdsourcing marketplace that makes it easier for individuals and busi... 39 APIs 63.7 AssemblyAI Built by AI experts, AssemblyAI's Speech AI models include accurate speech-to-text for voice data (such as ... 3 APIs 56.8 AIMLAPI AIMLAPI is a unified AI model API gateway providing access to 400+ state-of-the-art AI models from OpenAI, ... 10 APIs 56.3
Developing 9 Usable, with meaningful gaps to close
Amadeus Reservations Amadeus Reservations provides APIs for creating and managing travel bookings including flight orders, hotel... 1 API 55.1 Gemini Google's Gemini API provides access to state-of-the-art generative AI models for text generation, multimoda... 20 APIs 52.4 Amazon Nova Amazon Nova is a new generation of state-of-the-art foundation models from Amazon that deliver a compelling... 3 APIs 51.3 IMDb-API Community web service (operated under the IMDb-API / TV-API brand) providing movie, TV series and cast info... 6 APIs 49.0 Edamam Edamam is a food and nutrition data platform powering recipe search, NLP-based nutrition analysis, food dat... 10 APIs 48.9 Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 2 APIs 47.8 Words API Words API is a RESTful English-language API that provides definitions, synonyms, antonyms, related words, s... 9 APIs 43.6 Radio Browser Radio Browser is a free, community-driven directory of internet radio stations. The project publishes a pub... 4 APIs 43.1 Abortion Policy API The Abortion Policy API provides up-to-date information on US state abortion policies that can be integrate... 4 APIs 42.3
Thin 7 Limited public surface area
Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 1 API 41.9 Ron Swanson Quotes A community-built, open source HTTP API that returns Ron Swanson quotes from the NBC television series Park... 1 API 40.6 Apache OpenNLP Apache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports... 10 APIs 37.1 Apache OpenWhisk Apache OpenWhisk is an open-source serverless cloud platform that executes functions in response to events ... 6 APIs 37.1 Quote Garden Quote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathames... 3 APIs 36.1 Agora Agora is a real-time engagement platform providing ultra-low latency voice, video, signaling, chat, interac... 11 APIs 35.6 Shelf.io Shelf.io is the first knowledge automation platform and next-generation AI agentic platform for knowledge m... 3 APIs 33.3

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 Assistant SkillsVoice Assistants

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