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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
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Cartesia
S
Rows
A
Fireflies
A
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.Spreadsheets with AI + live integrations baked in.Sales-focused meeting AI with CRM integration.AI search done right. Cited answers, not chat theater.
CategoryVoiceDataMeetingsResearch
PricingFree tier + usage-based APIFree + $19-$89/user/moFree + $10-$19/user/moFree + $20/mo Pro
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.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
  • 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
  • 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
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • 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. The most interesting spreadsheet in years. Great for ops dashboards.A-tier for sales teams. B-tier for solo users.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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