Speech (STT/TTS)
Speech (STT/TTS) covers speech recognition, which turns speech into text, and speech synthesis, which turns text into speech.
In brief
Speech (STT/TTS), in brief.
What it isSpeech (STT/TTS) covers speech recognition, which turns speech into text, and speech synthesis, which turns text into speech.
Where it sitsOne of 24 categories in the Models layer. Models are the trained systems that do the work: language models, and models for speech, images, video, code, translation and forecasting. This layer covers both closed models reached through an API and open models you can download.
What we track40 products, including Amazon Polly, Amazon Transcribe, AssemblyAI (Universal STT), Azure AI Speech and Cartesia Sonic.
The products
40 products in Speech (STT/TTS).
Each name opens a search for that product in our index.
ProductMakerIts own site
From our census of 2026-11-08. A product listed here is one that belongs in this category; the search answer says whether we have checked it.
Questions
Speech (STT/TTS), answered.
What is Speech (STT/TTS) in AI infrastructure?Speech (STT/TTS) covers speech recognition, which turns speech into text, and speech synthesis, which turns text into speech.
Which layer of AI infrastructure is Speech (STT/TTS) in?Speech (STT/TTS) is in the Models layer. Models are the trained systems that do the work: language models, and models for speech, images, video, code, translation and forecasting. This layer covers both closed models reached through an API and open models you can download.
Which products are in Speech (STT/TTS)?We track 40 products in Speech (STT/TTS), including Amazon Polly, Amazon Transcribe, AssemblyAI (Universal STT), Azure AI Speech, Cartesia Sonic, Chatterbox, Coqui XTTS / TTS and CosyVoice. The full list is on this page.
Models
The other categories in Models.
3D generation & motionAvatar / digital humansBackground removal & mattingBenchmarks & leaderboardsCode modelsEmbedding modelsFrontier model APIsImage generation & editingImage upscaling & restorationLip-sync & dubbingMachine translation APIsModel hubs / registriesMultilingual / regional-language modelsMultimodal / vision-language modelsMusic & audio generationOpen-weight model familiesRealtime speech-to-speech modelsReasoning modelsRerankersSmall / on-device LLMsTime-series foundation modelsVideo generationWorld models