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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
Audio
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Agents
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Image
Video
Voice
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Cartesia
S
Rows
A
DALL-E 3
B
HeyGen
S
TaglineUltra-low-latency voice. Built for realtime agents.Spreadsheets with AI + live integrations baked in.OpenAI's image model. Built into ChatGPT Plus.AI avatar videos. Record once, speak any language.
CategoryVoiceDataImageVideo
PricingFree tier + usage-based APIFree + $19-$89/user/moIncluded with ChatGPT Plus $20/moFree + $24-$65/mo
Best forDevelopers building voice agents, phone bots, interactive apps.Ops teams, marketers, anyone building dashboards from multiple sources.ChatGPT Plus users who want images without paying extra.Course creators, multilingual marketers, anyone scaling video content.
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
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • 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
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • 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 most interesting spreadsheet in years. Great for ops dashboards.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.
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