Multilingual Speech-to-Text API with Superhuman Accuracy

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November 18, 2022

AssemblyAI

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Multilingual Speech-to-Text API with Superhuman Accuracy

Overview

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Conversation Intelligence Real Time Speech To Text Voice Agents Speech Recognition Voice Data Audio Analysis

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Meredith Rauch

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AssemblyAI provides AI models specifically designed for speech recognition and analysis. Its offerings include robust and accurate speech-to-text capabilities with applications such as transcribing calls, virtual meetings, podcasts, and building voice agents.

The company's AI models are equipped with features such as speaker diarization, sentiment analysis, summarization, and PII redaction, offering a comprehensive solution for converting voice data into actionable insights.

AssemblyAI's Universal STT model is touted to be a highly accurate, multilingual Speech AI model designed to handle a broad range of languages and accents.

AssemblyAI's technology is available through an API, meaning developers can incorporate their speech AI into applications with less hassle. Continuous improvements and updates ensure users always have access to the latest AI technology.

Rates are flexible, and customers are charged solely based on their exact usage of the AssemblyAI models. Not just limited to providing advanced technology, AssemblyAI also places a strong emphasis on customer support and a readily available team of AI experts.

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Initial release

August 22, 2017

Meredith Rauch

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Initial release of AssemblyAI.

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Transcription AssemblyAI

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4.5(4)2

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Voice detection2 0

Speech recognition1 0

Reviews

4.5

Average from 4 ratings.

★ ★ ★ ★ ★ 3

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Comments(2)

Andrew Hathaway

🙏 1 karma

Sep 2, 2025

Rated it

It's ok - English pre-recorded transcription is good. But if I need accuracy in real-time with lots of people talking and noisy background it tends to fall over. With the right use case, AssemblyAI is good enough - but with my specific audio requests, it's a bit hit and miss.

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Mery

🙏 61 karma

May 16, 2025

Rated it

One of the most accurate API's I've used for speech to text and summarization. Cost effective w/ bulk contracts too.

436 Reply Share Delete Report

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AssemblyAI was manually vetted by our editorial team and was first featured on November 18th 2022.

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Pros and Cons

Pros

State-of-the-art research integration

Capable of understanding audio

Transcribes live audio streams

Used by global enterprises

Proven transcription accuracy increase

In-depth tutorials for support

Comprehensive API documentation

Robust speech-to-text capabilities

Specifically designed for speech recognition

Speaker detection

Sentiment analysis

Chapter detection

PII redaction

Universal-1 handles wide language range

API facilitates easy integration

Continuous improvements and updates

Flexible, usage-based rates

Strong emphasis on customer support

24/7 customer assistance

User-friendly integration with applications

Integrates with virtual meeting platforms

Podcast transcription features

Audio data actionable insights

Applicable in tech development

Optimised for voice data analysis

Data insights from voice calls

View 21 more pros

Cons

No offline capabilities

Limited language support

No free tier

Usage-based pricing only

No mobile application

API centric, less user-friendly

Requires coding knowledge

Data privacy concerns

Dependent on third-party integrations

Unspecified update schedules

View 5 more cons

Included in lists

1 public list

Voice Generation/TTS

5519

Marcelo Prezoto Gomes

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Aug 3, 2024

I already have another transcription tool, but this one is much better. I love the different features such as the summary, quiz, and chapters. It does a great job of them. I've only done one transcript so far to try it out, but I'm truly impressed and am going to grab another code. A couple things that would make it even better are: - the ability to rename the files and organize them through folders. - the ability to download a copy of the other features as well as the transcript. Copying and pasting it works, but doesn't keep the format.

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Q&A

What is AssemblyAI?

AssemblyAI is a highly advanced AI tool dedicated to speech recognition and understanding. It offers an API to access AI models that accurately and efficiently transcribe and understand audio and video files, as well as live audio streams. These models are built on cutting edge AI research, enabling transcription, summarization, detection of hateful content, spoken topic identification, and more. The API is used by thousands of startups and large global enterprises due to its simplicity and security.

How does AssemblyAI's speech recognition work?

AssemblyAI employs state-of-the-art AI models for speech recognition. These models have been trained on vast amounts of multilingual audio data, enabling them to accurately transcribe and understand spoken text from various input formats, including video files, audio files, and live streams. Further, continuous updates and improvements ensure that the technology remains at the forefront of AI speech recognition.

What are the key use cases for AssemblyAI?

Meredith Rauch

🛠️ 1 tool

wrote:

AssemblyAI can be used for a multitude of applications. Some key use cases include transcribing calls, virtual meetings, voice agents and podcasts. Also, it offers features such as speaker detection, sentiment analysis, chapter detection, and PII redaction. These help in converting voice data into actionable insights, making it an ideal solution for businesses looking to gain more from their voice data.

Can AssemblyAI be used for multi-lingual transcription?

Meredith Rauch

🛠️ 1 tool

wrote:

Yes, AssemblyAI supports multi-lingual transcription. Its top-of-the-line speech AI model, known as Universal, is designed to manage a wide range of languages and accents, making the AI platform versatile for multi-lingual requirements.

What is the 'Universal' model in AssemblyAI?

Meredith Rauch

🛠️ 1 tool

wrote:

Universal is AssemblyAI's highly accurate, multilingual Speech AI model. It has been trained on 12.5M hours of multilingual audio data, designed to deliver superhuman accuracy in understanding and transcribing speech irrespective of languages, background noises and accents.

How accurate is AssemblyAI in transcribing calls and detecting speakers?

AssemblyAI has dramatically improved call transcription accuracy, reportedly increasing it by up to 23%. The AI models are capable of identifying and separating multiple speakers in audio or video files, enhancing the detail and usability of the transcription.

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What features does AssemblyAI offer for sentiment analysis?

AssemblyAI offers sentiment analysis as a part of its speech understanding capabilities. It can analyze transcribed text to identify and classify the emotional tone behind the speaker's words, providing valuable insights into customer sentiment and feedback.

How to integrate AssemblyAI's API into my application?

Integrating AssemblyAI's API into your application is relatively easy as developers get immediate access to their API. The website provides detailed documentation, complete with detailed code examples and explanations, which can aid the integration process. Developers can import 'assemblyai' into their application script language to use the transcription service by passing the relevant URL and configuration.

Does AssemblyAI offer PII redaction in its services?

Yes, Personal Identifiable Information (PII) redaction is one of the services offered by AssemblyAI. This service can be used for additional data privacy and compliance needs, which is particularly useful in sensitive industries such as healthcare, finance, and law.

What is the cost of using AssemblyAI's models?

The cost of using AssemblyAI's models is flexible and usage-based. Customers are charged specifically based on their exact usage of the AI models, allowing for optimal cost management.

How does AssemblyAI ensure the information transcribed is accurate?

To ensure the accuracy of transcriptions, AssemblyAI uses cutting-edge AI technology that has been trained on millions of hours of multilingual audio data. Besides, the company continually conducts improvements and updates on their models which reinforce the precision of transcriptions.

What kind of support does AssemblyAI offer to its customers?

AssemblyAI offers comprehensive support to its customers. This includes 24/7 customer support via their team of AI experts. There is an extensive library of detailed tutorials, documentation, and a changelog to provide additional assistance.

How can AssemblyAI be used for transcribing virtual meetings?

AssemblyAI can efficiently transcribe virtual meetings. Its AI models can convert spoken text to written format, distinguish different speakers and even analyze sentiment. This makes it an effective tool for documenting and understanding virtual meetings, webinars, conferences, etc.

How does AssemblyAI handle different languages and accents?

Meredith Rauch

🛠️ 1 tool

wrote:

AssemblyAI's Universal model is specifically designed to handle a broad spectrum of languages and accents. The model, which is trained on 12.5M hours of multilingual audio data, ensures accurate and efficient speech recognition regardless of the language or accent of the speaker.

What insights can AssemblyAI extract from voice data?

Meredith Rauch

🛠️ 1 tool

wrote:

From voice data, AssemblyAI can derive insights such as sentiment analysis, detection of various spoken topics, speaker diarization, and more. This wide range of analytics helps users get a deeper understanding of their voice data and optimally use it.

How used is AssemblyAI in the tech startup industry?

AssemblyAI is widely used within the tech startup industry with thousands of startups using their API. The simplicity, flexibility, and affordability of AssemblyAI's technology, as well as the powerful insights it can provide, make it an attractive choice for startups.

Can AssemblyAI be used to transcribe podcasts?

Yes, one of the key applications of AssemblyAI is transcribing podcasts. The accurate speech-to-text transcription of its AI models allows easy conversion of spoken content to written format, aiding in content accessibility, searchability, and comprehension.

What is the rate of improvement seen in the accuracy of call transcription with AssemblyAI?

AssemblyAI's AI models have proven to increase call transcription accuracy by up to 23%. This improvement signifies that AssemblyAI's transcription capabilities are substantially accurate, and they continue to enhance their models for even better performance.

How secure is the API provided by AssemblyAI?

AssemblyAI's API provides a secure interface for integrating their AI models into any application. The company employs stringent data security and data handling practices, ensuring that user data remains safe and compliant during the entire process.

Can AssemblyAI detect hateful content in transcriptions?

Yes, AssemblyAI can detect hateful content in transcriptions. Its AI models have features for understanding content and identifying abusive, harmful, or inappropriate language. This feature can be incredibly beneficial for moderating content and maintaining a respectful environment.

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