Speech-to-text API with summarisation, audio intelligence and streaming
AssemblyAI is a developer-facing speech API. It handles asynchronous transcription of uploaded audio and video, and low-latency streaming for live audio, then layers audio intelligence on top: summarisation, sentiment, topic detection, entity extraction, speaker labels and content moderation. Models are named and versioned, so you can pin a specific one and reason about what changed between releases. It is a building block rather than an application, delivered through REST endpoints, SDKs and webhooks with usage metered by audio hour, which suits teams embedding transcription into their own product.
Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.
transcription inside apps, call analytics, meeting notes and media subtitling
If you're comparing similar products, check the alternatives below, or browse all tools in the AI Audio & Music category.
Only a dashboard for managing keys, usage and test runs. The product is designed to be called from code, so if you want a click-and-download transcription page you are better served by a consumer tool.
Optional add-ons that run after transcription: summaries, sentiment, topic labels, entity extraction and moderation. They save you from running a separate text pipeline over the transcript.
By audio hour, with the intelligence and streaming features costing more than plain transcription. Estimate your monthly volume first, since a chatty product can accumulate hours faster than expected.
Text-to-speech voices that are hard to distinguish from humans
Professional audio workstation for editing, restoration and podcast mixing
Browser audio cleanup that makes phone recordings sound studio grade
Automatic audio post-production for loudness, levels and noise