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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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Cartesia
S
Fireflies
A
Claude Code
S
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.Sales-focused meeting AI with CRM integration.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI search done right. Cited answers, not chat theater.
CategoryVoiceMeetingsCodingResearch
PricingFree tier + usage-based APIFree + $10-$19/user/moPart of Claude Pro/Max/Team plansFree + $20/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Sales teams, customer success, anyone running many discovery calls.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Good CRM integrations (Salesforce, HubSpot)
  • Talk-time + sentiment analytics
  • Call scoring
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.A-tier for sales teams. B-tier for solo users.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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