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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
Fireflies
A
Rows
A
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.Sales-focused meeting AI with CRM integration.Spreadsheets with AI + live integrations baked in.AI search done right. Cited answers, not chat theater.
CategoryVoiceMeetingsDataResearch
PricingFree tier + usage-based APIFree + $10-$19/user/moFree + $19-$89/user/moFree + $20/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Sales teams, customer success, anyone running many discovery calls.Ops teams, marketers, anyone building dashboards from multiple sources.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
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • 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
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • 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.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.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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