The world's most advanced Speech-to-Text, customized for your application.

AssemblyAI is the most accurate, customizable, and easiest to integrate Speech-to-Text API for transcribing audio from phone calls, speeches, conferences, podcasts, and more.

Get up and running in minutes

Free for hackers, and no complicated contracts for companies. Just use the simple REST API to transcribe your audio. When you need help, our developers are in Slack 24/7 to provide support.

Train custom models for extremely high accuracy

In a single API call, create a custom model that'll be more tailored and accurate for your specific use case. No machine learning or AI experience required.

Built for any voice application

From phone call analytics to voice assistants, and everything in between, use the API to put accurate speech recognition into your application. With timestamps, confidence scores, unlimited custom word support, and a simple API, you can quickly build cutting edge voice applications.