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AssemblyAI vs Knock: 2026 Comparison

AssemblyAI Knock
Overview Accurate speech-to-text API with built-in audio intelligence features like summarization, sentiment analysis, and topic detection. A notifications infrastructure platform for building in-app, email, SMS, and push notification workflows with a single API.
Pricing Pay-per-use ($-$$$) Freemium (Free-$250/month)
Key Features
  • Speech-to-text
  • Speaker diarization
  • Summarization
  • Sentiment analysis
  • Topic detection
  • PII redaction
  • Real-time transcription
  • Multi-channel notifications
  • Preference management
  • In-app feed
  • Workflow builder
  • Batching
  • Throttling
  • Analytics
  • Templates
Pros
  • High accuracy
  • Rich audio intelligence
  • Easy integration
  • Real-time support
  • Multi-channel support
  • Good developer experience
  • Preference management
  • Easy integration
Cons
  • English-focused
  • Can be expensive
  • Limited language support
  • Newer platform
  • Can be expensive
  • Limited template editor
  • Smaller community