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AssemblyAI

AssemblyAI provides developers with a robust speech-to-text API, offering accurate transcriptions for both audio and video files, suited for media, healthcare, and customer service applications.

Developed by AssemblyAI, Inc.

View Source
99.90%Uptime
300msLatency
4.2kStars
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
  • Automated transcription for podcasts and webinarsOptimized Capability
  • Sentiment analysis on customer support callsOptimized Capability
  • Content moderation for user-generated audioOptimized Capability
  • Generating subtitles and closed captions for video contentOptimized Capability
Advantages
  • ✓ High transcription accuracy with advanced AI models
  • ✓ Scalable real-time and batch processing
  • ✓ Rich metadata: sentiment, topics, speaker diarization
  • ✓ Freemium tier allows low-risk experimentation
Limitations
  • ✗ Limits on concurrent real-time streams in free tier
  • ✗ Premium features (e.g., custom vocabulary) cost extra
  • ✗ Latency may vary based on audio length and quality
  • ✗ No official SDKs for less common languages like PHP or Rust

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
Time to Hello World

Under 10 minutes to sign up and start transcribing

Rate Limit

500 requests per minute

Free Tier Usage

First 3,000 minutes per month free, then pay-as-you-go

Use Case: Best For

Developers building transcription, analytics, or voice-based services quickly

Not Recommended For

Ultra low-latency embedded systems or offline-only scenarios

Resources

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

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