AssemblyAI

Industry-leading AI models to transcribe and understand speech with unmatched accuracy and scalability.

Freemium

Web

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#Conversation Intelligence #Multilingual Transcription #Real-Time Transcription #Speaker Diarization #Transcription+1

Overview

AssemblyAI offers state-of-the-art speech-to-text and speech understanding AI models designed for developers to build, ship, and scale voice AI applications with high accuracy, multilingual support, and advanced features like speaker diarization and contextual prompting.

Key Features

Universal-3 Pro Model

Industry-leading speech-to-text model with the lowest word error rate, advanced contextual prompting, and support for multiple languages including English, Spanish, French, German, Italian, and Portuguese.

Streaming Speech-to-Text

Real-time transcription with ultra-low latency, precise end-of-turn detection, and high accuracy optimized for voice agents and live audio streams.

Speaker Diarization and Identification

Detects multiple speakers in audio, segments utterances, and labels speakers by name or role to enhance conversational analysis.

Automatic Language Detection and Code-Switching

Supports over 99 languages with automatic detection and natural preservation of code-switching between languages in transcripts.

Advanced Audio Intelligence

Includes features like sentiment analysis, entity detection, translation, custom formatting, and tagging of non-speech audio events for deeper insights.

Customizable Prompting and Keyterms

Allows users to control transcription behavior with plain language instructions and improve accuracy by providing domain-specific words and phrases.

Global Formatting and Multilingual Support

Automatically formats dates, numbers, and punctuation according to regional and language standards, supporting diverse global user bases.

Developer-First API and Scalability

Easy to integrate API with no contracts or throttles, supporting millions of inference calls monthly and flexible pay-as-you-go pricing.

Who It's For

How to Use

Sign Up and Access API

Create an account on AssemblyAI and obtain API keys to start integrating speech-to-text services.

Upload Audio or Stream Live

Send prerecorded audio files or live audio streams to the API for transcription processing.

Configure Transcription Options

Use advanced features like speaker diarization, keyterms prompting, and custom formatting to tailor output.

Receive and Process Transcripts

Retrieve transcription results with timestamps, speaker labels, and audio intelligence insights via API.

Integrate Transcripts into Applications

Use the transcribed and analyzed data to power voice apps, conversational AI, or analytics workflows.

Pricing

Pricing details are gathered from the official AssemblyAI website and are provided for reference only. Always confirm the latest information directly with the vendor.

Plan	Price	Highlights
Free Plan	Free	Up to 185 hours of prerecorded audio transcription Up to 333 hours of streaming audio transcription Limited concurrency and streams Access to core speech-to-text and audio intelligence models Developer documentation and community support
Pay As You Go	Starting at $0.15/hr	Unlimited access to all models including Speech Understanding and LLM Gateway Unlimited concurrent streams and prerecorded concurrency Customizable rate limits and scaling Dedicated technical support and SLAs Compliance with HIPAA and EU data residency standards
Enterprise Plan	Contact Sales	Tiered pricing for high-volume usage Dedicated infrastructure and custom model configurations Enhanced concurrency and rate limits Self-hosted deployments (On-prem, EU, VPC) Custom SLAs and compliance support

Found a change in pricing? We welcome corrections. Reach out so we can keep this listing accurate.

Pros & Cons

Pros

Industry-leading transcription accuracy with low word error rates.
Supports real-time streaming and batch transcription workflows.
Advanced features like speaker diarization, sentiment analysis, and entity detection.
Multilingual support with automatic language detection and code-switching.
Flexible, usage-based pricing with no upfront contracts and scalable infrastructure.

Cons

Pricing can be complex due to multiple add-ons and model options.
Some advanced features like custom model configurations require enterprise contact.
Primarily focused on speech-to-text; lacks built-in audio generation or editing.
May require technical expertise to fully leverage API capabilities.
Limited direct end-user interface; mainly developer-focused platform.

Use Cases

Explore tools grouped by use case so you can keep researching without losing momentum.

Frequently Asked Questions

Ratings & reviews

Average rating

5.01 review

Share your experience

Help others decide, your insights matter — no account needed

Community reviews (1)

Most recent

Taylor GRising Star5/5
Jul 20, 2026
Recommends this tool
The speaker labels were probably my favorite feature in AssemblyAI. It made conversations much easier to follow and the AI summary saved me time when reviewing longer recordings.
1 helpful0 not helpful

Average rating

5.01 review

Share your experience

Help others decide, your insights matter — no account needed

Community reviews (1)

Most recent

Taylor GRising Star5/5
Jul 20, 2026
Recommends this tool
The speaker labels were probably my favorite feature in AssemblyAI. It made conversations much easier to follow and the AI summary saved me time when reviewing longer recordings.
1 helpful0 not helpful

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Key Features

Universal-3 Pro Model

Streaming Speech-to-Text

Real-time transcription with ultra-low latency, precise end-of-turn detection, and high accuracy optimized for voice agents and live audio streams.

Speaker Diarization and Identification

Detects multiple speakers in audio, segments utterances, and labels speakers by name or role to enhance conversational analysis.

Automatic Language Detection and Code-Switching

Supports over 99 languages with automatic detection and natural preservation of code-switching between languages in transcripts.

Advanced Audio Intelligence

Includes features like sentiment analysis, entity detection, translation, custom formatting, and tagging of non-speech audio events for deeper insights.

Customizable Prompting and Keyterms

Allows users to control transcription behavior with plain language instructions and improve accuracy by providing domain-specific words and phrases.

Global Formatting and Multilingual Support

Automatically formats dates, numbers, and punctuation according to regional and language standards, supporting diverse global user bases.

Developer-First API and Scalability

Easy to integrate API with no contracts or throttles, supporting millions of inference calls monthly and flexible pay-as-you-go pricing.

Who It's For

How to Use

Sign Up and Access API

Create an account on AssemblyAI and obtain API keys to start integrating speech-to-text services.

Upload Audio or Stream Live

Send prerecorded audio files or live audio streams to the API for transcription processing.

Configure Transcription Options

Use advanced features like speaker diarization, keyterms prompting, and custom formatting to tailor output.

Receive and Process Transcripts

Retrieve transcription results with timestamps, speaker labels, and audio intelligence insights via API.

Integrate Transcripts into Applications

Use the transcribed and analyzed data to power voice apps, conversational AI, or analytics workflows.

Pricing

Pricing details are gathered from the official AssemblyAI website and are provided for reference only. Always confirm the latest information directly with the vendor.

Plan	Price	Highlights
Free Plan	Free	Up to 185 hours of prerecorded audio transcription Up to 333 hours of streaming audio transcription Limited concurrency and streams Access to core speech-to-text and audio intelligence models Developer documentation and community support
Pay As You Go	Starting at $0.15/hr	Unlimited access to all models including Speech Understanding and LLM Gateway Unlimited concurrent streams and prerecorded concurrency Customizable rate limits and scaling Dedicated technical support and SLAs Compliance with HIPAA and EU data residency standards
Enterprise Plan	Contact Sales	Tiered pricing for high-volume usage Dedicated infrastructure and custom model configurations Enhanced concurrency and rate limits Self-hosted deployments (On-prem, EU, VPC) Custom SLAs and compliance support

Found a change in pricing? We welcome corrections. Reach out so we can keep this listing accurate.

Pros & Cons

Pros

Industry-leading transcription accuracy with low word error rates.
Supports real-time streaming and batch transcription workflows.
Advanced features like speaker diarization, sentiment analysis, and entity detection.
Multilingual support with automatic language detection and code-switching.
Flexible, usage-based pricing with no upfront contracts and scalable infrastructure.

Cons

Pricing can be complex due to multiple add-ons and model options.
Some advanced features like custom model configurations require enterprise contact.
Primarily focused on speech-to-text; lacks built-in audio generation or editing.
May require technical expertise to fully leverage API capabilities.
Limited direct end-user interface; mainly developer-focused platform.

Use Cases

Explore tools grouped by use case so you can keep researching without losing momentum.

AssemblyAI

Overview

Featured Video

Key Features

Universal-3 Pro Model

Streaming Speech-to-Text

Speaker Diarization and Identification

Automatic Language Detection and Code-Switching

Advanced Audio Intelligence

Customizable Prompting and Keyterms

Global Formatting and Multilingual Support

Developer-First API and Scalability

Who It's For

How to Use

Sign Up and Access API

Upload Audio or Stream Live

Configure Transcription Options

Receive and Process Transcripts

Integrate Transcripts into Applications

Pricing

Pros & Cons

Pros

Cons

Use Cases

Frequently Asked Questions

Ratings & reviews

Community reviews (1)

Community reviews (1)

Featured Video

Key Features

Universal-3 Pro Model

Streaming Speech-to-Text

Speaker Diarization and Identification

Automatic Language Detection and Code-Switching

Advanced Audio Intelligence

Customizable Prompting and Keyterms

Global Formatting and Multilingual Support

Developer-First API and Scalability

Who It's For

How to Use

Sign Up and Access API

Upload Audio or Stream Live

Configure Transcription Options

Receive and Process Transcripts

Integrate Transcripts into Applications

Pricing

Pros & Cons

Pros

Cons

Use Cases

Frequently Asked Questions

Community reviews (1)