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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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Chatbots
Research
Coding
Image
Video
Voice
Meetings
Design
Productivity
Audio
Writing
Agents
Dev Platform
Data
Marketing
Education
Cartesia
S
GitHub Copilot
B
Figma AI
A
Replicate
S
TaglineUltra-low-latency voice. Built for realtime agents.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI features baked into the design tool you already use.Run any open-source AI model with an API call.
CategoryVoiceCodingDesignDev Platform
PricingFree tier + usage-based APIFree (limited) + $10/mo Pro + $19/mo BusinessIncluded with Figma plansPay per second of compute
Best forDevelopers building voice agents, phone bots, interactive apps.Teams with GitHub already. Devs who don't want to change IDEs.Designers already on Figma.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • First drafts with Make Designs
  • Rename/rearrange layers automatically
  • Natural language asset search
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Features vary by plan + region
  • Still rolling out
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. No reason not to use it if you're on Figma. Not worth switching for.S-tier for open-source model APIs. The default in this space.
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