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AssemblyAI vs Seamless.ai: 2026 Comparison

AssemblyAI Seamless.ai
Overview Accurate speech-to-text API with built-in audio intelligence features like summarization, sentiment analysis, and topic detection. Seamless.ai is a real-time search engine for B2B sales leads that uses AI to find verified contact information. It helps sales teams build accurate lead lists with phone numbers and email addresses.
Pricing Pay-per-use ($-$$$) Freemium ($0-147/user/mo)
Key Features
  • Speech-to-text
  • Speaker diarization
  • Summarization
  • Sentiment analysis
  • Topic detection
  • PII redaction
  • Real-time transcription
  • Real-time contact search
  • email finder
  • phone numbers
  • Chrome extension
  • CRM integration
  • list building
  • buyer intent
Pros
  • High accuracy
  • Rich audio intelligence
  • Easy integration
  • Real-time support
  • Large database
  • Real-time verification
  • Good phone numbers
  • Easy to use
Cons
  • English-focused
  • Can be expensive
  • Limited language support
  • Aggressive sales tactics
  • Data accuracy inconsistent
  • Pushy upselling

AssemblyAI

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Seamless.ai

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