What platforms does AssemblyAI support?

AssemblyAI is available on Web App.

What are the limitations of AssemblyAI?

It is an API-first product, so non-developers have no ready-made editor for uploading audio. Text-to-speech is listed as coming soon rather than generally available. Per-minute rates and plan tiers are not shown on the homepage, forcing a separate pricing check.

AssemblyAI

Name: AssemblyAI
Author: AssemblyAI

Speech AI APIs for transcribing and understanding voice data

Advanced API

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Screenshot of AssemblyAI, Speech AI APIs for transcribing and understanding voice data

What is AssemblyAI?

AssemblyAI is an AI transcriber tool. AssemblyAI provides speech-to-text and speech understanding APIs, including pre-recorded, streaming, sync and dictation endpoints, for developers building voice features into their own products. It also offers speech understanding, guardrails and an LLM gateway, with cloud or self-hosted inference and support for 99 languages.

AssemblyAI is a developer platform for speech recognition and audio intelligence, delivered as APIs rather than a finished consumer app. The core offering is a pre-recorded speech-to-text endpoint, complemented by real-time streaming transcription, a synchronous transcription API, speech understanding models that pull structure and insight from audio, a text-to-speech service marked as coming soon, and a dictation API built specifically so that spoken input returns clean text with filler words removed, self-corrections resolved and names spelled correctly. The product is aimed at engineering teams building voice features into their own software: notetakers, call analytics pipelines, medical transcription and AI scribe tools, agent assist systems and voice agents. The homepage cites Zoom, Fireflies, Granola, LiveKit, ClickUp and Apollo among customers, and positions an LLM Gateway and guardrails products alongside transcription, suggesting buyers who want the speech layer and the safety and routing layer from one vendor. In practice a developer signs up for a dashboard account, gets an API key and calls the endpoints from code, with Python shown in the homepage sample. Deployment is flexible: a cloud inference option or self-hosted inference for teams that need to keep audio in their own environment. The speech model highlighted on the homepage is Universal-3.5 Pro, and language coverage extends to 99 languages, with per-language pages for English, Spanish, Portuguese, French, German, Russian, Hindi, Dutch, Japanese and Italian. Compared with consumer transcription apps, AssemblyAI competes on infrastructure: it is the underlying engine other products embed, not a destination for pasting a file and reading a transcript. Teams that want an off-the-shelf editor will find it raw, while teams building their own product get broad API coverage and documented cookbooks. Pricing tiers and per-minute rates are not stated on the homepage, so buyers should consult the pricing page before committing.

How do you use AssemblyAI?

1Create a dashboard account
Sign up on the AssemblyAI dashboard to get access to the console and an API key for the speech models.
2Pick the transcription endpoint you need
Review the pre-recorded, streaming and sync speech-to-text products and choose the one that matches your audio flow.
3Read the API reference and cookbooks
Work through the API overview and the example cookbooks to see request shapes and typical pipelines before writing production code.
4Choose a deployment model
Decide between the Voice AI Cloud and self-hosted inference depending on where audio must be processed and stored.
5Run a test transcription with your own audio
Send a sample recording through the API and compare the returned transcript against your expectations before scaling usage.

Pros and cons

Pros

Covers pre-recorded, real-time streaming, sync and dictation transcription from one vendorAI
Speech understanding, guardrails and an LLM gateway are available alongside the core transcription modelsAI
Choice of cloud inference or self-hosted deployment for teams with data residency constraintsAI
Language coverage across 99 languages with dedicated pages for major onesAI
Documented via API reference and cookbooks, with named customers such as Zoom and FirefliesAI

Cons

It is an API-first product, so non-developers have no ready-made editor for uploading audioAI
Text-to-speech is listed as coming soon rather than generally availableAI
Per-minute rates and plan tiers are not shown on the homepage, forcing a separate pricing checkAI
Self-hosted inference likely adds operational overhead that the marketing pages do not detailAI
Accuracy and latency claims rely on vendor benchmarks, so buyers should test on their own audioAI

How much does AssemblyAI cost?

Free trial

The homepage offers a free sign-up path through the dashboard, but no trial length, credit allowance or per-minute pricing is stated, so the exact free allowance needs confirmation on the pricing page.

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Support

A support contact page is linked from the site navigation alongside documentation, API reference, cookbooks, changelog and a public status page. Response times and support tiers are not described on the homepage.

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Features

Core capabilities include pre-recorded speech-to-text, real-time streaming transcription, a sync speech-to-text endpoint and a dictation API that removes filler words and resolves self-corrections. Speech understanding, guardrails and safety, and an LLM gateway extend the platform, with voice agent and text-to-speech APIs listed. Inference runs in the Voice AI Cloud or self-hosted, and transcription covers 99 languages.

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Frequently asked questions about AssemblyAI

Does AssemblyAI offer a free trial?
The homepage offers a free sign-up path through the dashboard, but no trial length, credit allowance or per-minute pricing is stated, so the exact free allowance needs confirmation on the pricing page.
Does AssemblyAI have an API?
Yes, AssemblyAI offers an API.
How do you use AssemblyAI?
The walkthrough on this page covers 5 steps: 1. Create a dashboard account 2. Pick the transcription endpoint you need 3. Read the API reference and cookbooks 4. Choose a deployment model 5. Run a test transcription with your own audio.
What platforms does AssemblyAI support?
AssemblyAI is available on Web App.
What are the limitations of AssemblyAI?
It is an API-first product, so non-developers have no ready-made editor for uploading audio. Text-to-speech is listed as coming soon rather than generally available. Per-minute rates and plan tiers are not shown on the homepage, forcing a separate pricing check.