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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
Rows
A
HeyGen
S
Sora
A
TaglineUltra-low-latency voice. Built for realtime agents.Spreadsheets with AI + live integrations baked in.AI avatar videos. Record once, speak any language.OpenAI's video model. Long clips, cinematic quality.
CategoryVoiceDataVideoVideo
PricingFree tier + usage-based APIFree + $19-$89/user/moFree + $24-$65/moIncluded with ChatGPT Plus/Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Ops teams, marketers, anyone building dashboards from multiple sources.Course creators, multilingual marketers, anyone scaling video content.ChatGPT subscribers experimenting with cinematic shots.
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
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • 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
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
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.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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