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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
Gemini
A
Rows
A
HeyGen
S
TaglineUltra-low-latency voice. Built for realtime agents.Google's answer. Best integrated with Workspace + free for a lot.Spreadsheets with AI + live integrations baked in.AI avatar videos. Record once, speak any language.
CategoryVoiceChatbotsDataVideo
PricingFree tier + usage-based APIFree + $20/mo Advanced (bundled with 2TB Drive)Free + $19-$89/user/moFree + $24-$65/mo
Best forDevelopers building voice agents, phone bots, interactive apps.Anyone already on Google, research tasks, summarizing long documents.Ops teams, marketers, anyone building dashboards from multiple sources.Course creators, multilingual marketers, anyone scaling video content.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.
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