What products does AssemblyAI offer?

AssemblyAI offers several products including Speech-to-Text, Streaming Speech-to-Text, Speech Understanding, LLM Gateway, Guardrails, and Speech-to-Speech API. These products cater to different needs, from transcribing pre-recorded audio to real-time analysis of streaming audio.

What are some common use cases for AssemblyAI?

AssemblyAI is used in various industries and applications, including conversation intelligence, medical transcription, contact centers, voice agents, and AI notetakers. It helps improve customer experience, automate tasks, and gain insights from voice data.

How can I try AssemblyAI?

You can try AssemblyAI for free by signing up for an account and exploring the API. AssemblyAI also offers a no-code playground where you can test the AI models.

What level of accuracy can I expect from AssemblyAI's speech-to-text models?

AssemblyAI's models are designed for industry-leading accuracy, featuring the lowest Word Error Rate (WER) and up to 30% fewer hallucinations compared to other providers. They are also preferred by 73% of end-users in unbiased evaluations.

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AssemblyAI

Name: AssemblyAI
Rating: 4 (9 reviews)

Industry-leading Speech AI models for transcribing speech to text and extracting insights from voice data.

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Published: 2025/12/20

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Introduction

AssemblyAI provides powerful Speech-to-Text and Speech Understanding APIs. Key features include high accuracy, real-time streaming transcription, speaker diarization, sentiment analysis, and automatic language detection. It's designed for developers building voice-enabled applications, conversation intelligence platforms, and AI-powered assistants. AssemblyAI's platform scales to handle millions of API calls, processing vast amounts of audio data daily, making it suitable for both startups and large enterprises.

Alternatives

Google Cloud Speech-to-Text
Offers highly accurate and scalable speech recognition with extensive language support, suitable for various applications.
AWS Transcribe
Provides a fully managed speech-to-text service that integrates seamlessly with other AWS services for comprehensive voice data processing.
Microsoft Azure Cognitive Services Speech
Delivers a suite of customizable speech AI tools, including transcription, speaker recognition, and language understanding.
Deepgram
Known for its real-time, highly accurate, and customizable speech-to-text API, particularly strong for live audio processing.
Rev.ai
Offers a robust API for automated speech recognition, often used for its balance of accuracy and speed in various transcription needs.
OpenAI Whisper
Provides a powerful open-source general-purpose speech recognition model that can transcribe and translate audio into text.
Voci Technologies
Specializes in enterprise-grade speech analytics and transcription, focusing on extracting actionable insights from large volumes of voice data.
Verbit
Combines AI and human expertise to deliver highly accurate transcription, captioning, and subtitling services for diverse industries.
Nuance Communications
A long-established leader in speech recognition technology, offering advanced solutions for healthcare, customer service, and enterprise applications.
Speechmatics
Provides highly accurate and scalable speech-to-text technology with a focus on language diversity and customizability for enterprise use cases.

User Reviews

4.0/5.0

(9reviews)

Click stars to rate

Pricing

Pricing Model: Freemium, Usage-based

Free

Start for free with initial credits to explore AssemblyAI's APIs.

Free

Custom / Enterprise

Tailored solutions for enterprises processing millions of requests, needing dedicated infrastructure, or requiring custom model configurations.

Contact for pricing

Pre-recorded Speech-to-Text: Universal

Fast, accurate transcription across 99 languages—exceptional accuracy straight out of the box.

$0.15/hr

Pre-recorded Speech-to-Text: Slam-1

Highest accuracy transcription powered by LLM intelligence—understands context, not just words. Only available in English.

$0.27/hr

Streaming Speech-to-Text: Universal-Streaming

Ultra-fast, ultra-accurate real-time transcription. Built-in turn detection, and unlimited concurrency.

$0.15/hr

Streaming Speech-to-Text: Universal-Streaming Multilingual

Ultra-fast, ultra-accurate real-time transcription in English, Spanish, French, German, Italian, and Portuguese. Built-in turn detection, and unlimited concurrency.

$0.15/hr

Streaming Speech-to-Text: Keyterms Prompting

Improve recognition accuracy for specific words and phrases that are important to your use case.

$0.04/hr

Speech Understanding: Speaker Identification

Identify speakers by their actual names or roles, transforming generic labels like “Speaker A” or “Speaker B” into meaningful identifiers that you provide.

$0.02/hr

Speech Understanding: Translation

Automatically converts your transcribed audio content from one language to another, enabling you to reach global audiences without manual translation work.

$0.06/hr

Speech Understanding: Custom Formatting

Automatically standardizes and formats specific types of information in your transcripts, ensuring consistency across dates, phone numbers, emails, and other data types.

$0.03/hr

Speech Understanding: Entity Detection

Identify a wide range of entities that are spoken in your audio files, such as person and company names, email addresses, dates, and locations.

$0.08/hr

Speech Understanding: Sentiment Analysis

Detect the sentiment of each sentence of speech spoken in your audio files.

$0.02/hr

Speech Understanding: Auto Chapters

Automatically generate a summary over time for audio and video files.

$0.08/hr

Speech Understanding: Key Phrases

Accurately identify significant words and phrases in your transcription, enabling you to extract the most pertinent concepts or highlights from your audio/video file.

$0.01/hr

Speech Understanding: Topic Detection

Label the topics that are spoken in your audio and video files. The predicted topic labels follow the standardized IAB Taxonomy, which makes them suitable for contextual targeting.

$0.15/hr

Speech Understanding: Summarization

Leverage our AI-powered Summarization models to automatically summarize audio/video data in your products at scale. Customize the summary types to best fit your use case.

$0.03/hr

Guardrails: Profanity Filtering

Automatically filter out profanity from your transcripts.

$0.01/hr

Guardrails: PII Audio Redaction

Identify and remove Personally Identifiable Information, such as phone numbers and social security numbers, from the audio file before it is returned to you.

$0.05/hr

Guardrails: PII Redaction

Identify and remove Personally Identifiable Information, such as phone numbers and social security numbers, from the transcription text before it is returned to you.

$0.08/hr

Guardrails: Content Moderation

Detect sensitive content in your audio and video files - such as hate speech, violence, sensitive social issues, alcohol, drugs, and more.

$0.15/hr

LLM Gateway: GPT-5.2