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AssemblyAI

AssemblyAI offers developers a powerful speech-to-text API for converting audio and video content into accurate text transcripts, ideal for various applications.

Developed by AssemblyAI, Inc.

Live API
99.90%Uptime
500msLatency
203Stars
API KeyAuth
NoCredit Card
RESTStyle
v2Version
API Endpoints

Reference for available routes, request structures, and live examples.

Transcribes audio files to text with speaker diarization

Full Endpoint URL
https://api.assemblyai.com/transcript
Implementation Example
curl -X POST 'https://api.assemblyai.com/transcript' \
  -H 'Authorization: Bearer YOUR_API_KEY'
Request Payload
{
  "audio_url": "https://example.com/audio.mp3",
  "speaker_labels": true
}
Expected Response
{
  "id": "abc123",
  "text": "Hello world this is a test",
  "words": [
    {
      "end": 0.8,
      "word": "Hello",
      "start": 0.5,
      "speaker": "A"
    }
  ],
  "status": "completed"
}
Version:v2
Limit:300 minutes/month
Real-World Applications
  • Transcribing podcasts for accessibilityOptimized Capability
  • Analyzing customer service calls for sentiment insightsOptimized Capability
  • Generating subtitles for video content automaticallyOptimized Capability
  • Monitoring compliance in healthcare communicationsOptimized Capability
  • Real-time transcription for live eventsOptimized Capability
Advantages
  • ✓ Highly accurate AI-powered transcription
  • ✓ Supports both audio and video file formats
  • ✓ Provides advanced features like sentiment analysis and topic detection
  • ✓ Easy-to-use REST API with JSON responses
  • ✓ Real-time streaming transcription support
Limitations
  • ✗ Rate limits are not explicitly defined and could require monitoring
  • ✗ Free tier has usage limitations
  • ✗ Some advanced features may require premium plans
  • ✗ Limited support for non-English languages currently
  • ✗ Latency can vary based on file size and network conditions

FAQs

API Specifications

v2
Pricing Model
Pay-as-you-go with volume discounts
Credit Card
Not Required
Response Formats
JSON
Supported Languages
6 Languages
SDK Support
Python, JavaScript, Ruby, Java
Time to Hello World

Minutes to one hour depending on integration complexity

Rate Limit

600 requests per minute

Free Tier Usage

Free tier includes 5 hours of transcription per month with limited access to advanced features

Use Case: Best For

Developers needing fast, accurate speech-to-text conversion for audio and video applications

Not Recommended For

Projects requiring extensive multi-language transcription or on-premise deployment

Resources

Documentation Official Website Pricing Details Postman Collection
#audio#speech-recognition

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