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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
Research
Agents
Coding
Chatbots
Image
Video
Voice
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Cartesia
S
Claude Code
S
Gemini
A
Windsurf
A
TaglineUltra-low-latency voice. Built for realtime agents.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Google's answer. Best integrated with Workspace + free for a lot.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryVoiceCodingChatbotsCoding
PricingFree tier + usage-based APIPart of Claude Pro/Max/Team plansFree + $20/mo Advanced (bundled with 2TB Drive)Free + $15/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Anyone already on Google, research tasks, summarizing long documents.Developers who want Cursor-like power for less money.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Smaller community
  • Model selection more limited
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier. Close second to Cursor. If $5/mo matters, start here.
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