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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
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Image
Meetings
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Productivity
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Data
Marketing
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Cartesia
S
Rows
A
Fireflies
A
Replicate
S
TaglineUltra-low-latency voice. Built for realtime agents.Spreadsheets with AI + live integrations baked in.Sales-focused meeting AI with CRM integration.Run any open-source AI model with an API call.
CategoryVoiceDataMeetingsDev Platform
PricingFree tier + usage-based APIFree + $19-$89/user/moFree + $10-$19/user/moPay per second of compute
Best forDevelopers building voice agents, phone bots, interactive apps.Ops teams, marketers, anyone building dashboards from multiple sources.Sales teams, customer success, anyone running many discovery calls.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Good CRM integrations (Salesforce, HubSpot)
  • Talk-time + sentiment analytics
  • Call scoring
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier for sales teams. B-tier for solo users.S-tier for open-source model APIs. The default in this space.
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