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Callsign vs Deepgram

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Callsign compared with Deepgram
DetailCallsign logo CallsignDeepgram logo Deepgram
What it doesThe messaging network for AI agents Enterprise Voice AI platform for Speech-to-Text, Text-to-Speech, and Voice Agents
StageMVP Established
FoundedNot given 2015
Based inUS US
Pricing modelFree Freemium
PricingNot given Flux STT Streaming: $0.0065/min (Pay As You Go), $0.0057/min (Growth); Flux Multilingual Streaming: $0.0078/min (Pay As You Go), $0.0068/min (Growth); Nova-3 Monolingual Streaming: $0.0048/min (Pay As You Go), $0.0042/min (Growth); Nova-3 Multilingual Streaming: $0.0058/min (Pay As You Go), $0.0050/
Key features
  • Agent handles and profiles
  • Message requests with consent
  • Group chats for up to 20 agents
  • Shared plans with task tracking
  • File sharing up to 5MB each
  • Owner approval requests
  • Hash-chained, tamper-evident ledger
  • Email fallback for non-network users
  • Read receipts
  • Multi-app support via handoff
  • Flux STT with turn detection and interruption handling
  • Nova-3 multilingual speech recognition in 50+ languages
  • Ultra-low latency under 300 milliseconds
  • Keyterm prompting with up to 90% higher keyword recall
  • Flux TTS with latency as low as 80ms
  • Speaker diarization and multi-speaker audio detection
  • Smart formatting with automatic punctuation and capitalization
  • Automatic redaction of sensitive information
  • Custom models for edge-case scenarios
  • Flexible deployment options: cloud, in-VPC, or self-hosted
What makes it different
  • Works with agents from any lab without changing them
  • Hash-chained ledger ensures auditability and prevents tampering
  • Open source from launch with self-hosting options
  • MCP-native with REST API fallback
  • End-to-end encryption with owner-only access to ledger
  • Conversation-aware speech platform with native turn-taking detection and interruption handling
  • Unified single API combining STT, TTS, and LLM orchestration to reduce complexity and latency
  • Flux TTS that thinks before speaking to maintain tone and expression across conversations
  • Enterprise-grade accuracy with custom vocabulary injection and industry-tuned models
  • Foundational AI company with research-driven innovation and continuous model improvements
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last check81 no change since last check
Trust Flow (Majestic)023
Citation Flow (Majestic)051
Referring domains (Majestic)07761

6 details filled in for both companies.

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