Use Case

Voice & Speech

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

22 providers 87 APIs 20 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 OpenAI, S&P Global, Amazon Polly, AIMLAPI, WhatsApp.

Providers

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

Exemplar 2 Complete, well-documented, and agent-ready
OpenAIOpenAI publishes a single unversioned REST API at https://api.openai.com/v1 covering text and reasoning (Re...15 APIs76.8S&P GlobalS&P Global (NYSE SPGI) is the parent of S&P Global Ratings, S&P Global Market Intelligence, S&P Dow Jones I...5 APIs67.3
Strong 2 Solid coverage with minor gaps
Amazon PollyAmazon Polly is a cloud service that converts text into lifelike speech, enabling you to create application...2 APIs60.4AIMLAPIAIMLAPI is a unified AI model API gateway providing access to 400+ state-of-the-art AI models from OpenAI, ...1 API59.7
Developing 9 Usable, with meaningful gaps to close
WhatsAppAPIs for the WhatsApp messaging platform, enabling businesses to communicate with customers through the wor...2 APIs52.3Amazon Mechanical TurkAmazon Mechanical Turk (MTurk) is a crowdsourcing marketplace that makes it easier for individuals and busi...1 API51.1GeminiGoogle's Gemini API provides access to state-of-the-art generative AI models for text generation, multimoda...1 API48.7IMDb-APICommunity web service (operated under the IMDb-API / TV-API brand) providing movie, TV series and cast info...1 API48.4Radio BrowserRadio Browser is a free, community-driven directory of internet radio stations. The project publishes a pub...1 API46.2Amazon NovaAmazon Nova is a new generation of state-of-the-art foundation models from Amazon that deliver a compelling...1 API45.7AssemblyAIBuilt by AI experts, AssemblyAI's Speech AI models include accurate speech-to-text for voice data (such as ...1 API45.5Wolfram|AlphaWolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a...2 APIs40.9EdamamEdamam is a food and nutrition data platform powering recipe search, NLP-based nutrition analysis, food dat...4 APIs39.9
Thin 6 Limited public surface area
Words APIWords API is a RESTful English-language API that provides definitions, synonyms, antonyms, related words, s...9 APIs38.5Abortion Policy APIThe Abortion Policy API provides up-to-date information on US state abortion policies that can be integrate...4 APIs35.8Ron Swanson QuotesA community-built, open source HTTP API that returns Ron Swanson quotes from the NBC television series Park...1 API35.0Quote GardenQuote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathames...1 API30.6AgoraAgora is a real-time engagement platform providing ultra-low latency voice, video, signaling, chat, interac...11 APIs30.1Amadeus ReservationsAmadeus Reservations provides APIs for creating and managing travel bookings including flight orders, hotel...5 APIs30.1
Emerging 3 Early or largely undocumented
Shelf.ioShelf.io is the first knowledge automation platform and next-generation AI agentic platform for knowledge m...3 APIs25.0Apache OpenNLPApache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports...10 APIs24.0Apache OpenWhiskApache OpenWhisk is an open-source serverless cloud platform that executes functions in response to events ...6 APIs23.9

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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