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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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Voice
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Cartesia
S
HeyGen
S
Rows
A
Sora
A
TaglineUltra-low-latency voice. Built for realtime agents.AI avatar videos. Record once, speak any language.Spreadsheets with AI + live integrations baked in.OpenAI's video model. Long clips, cinematic quality.
CategoryVoiceVideoDataVideo
PricingFree tier + usage-based APIFree + $24-$65/moFree + $19-$89/user/moIncluded with ChatGPT Plus/Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Course creators, multilingual marketers, anyone scaling video content.Ops teams, marketers, anyone building dashboards from multiple sources.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • 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
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • 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.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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