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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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Windsurf
A
Rows
A
Cartesia
S
Claude Code
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Spreadsheets with AI + live integrations baked in.Ultra-low-latency voice. Built for realtime agents.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
CategoryCodingDataVoiceCoding
PricingFree + $15/mo ProFree + $19-$89/user/moFree tier + usage-based APIPart of Claude Pro/Max/Team plans
Best forDevelopers who want Cursor-like power for less money.Ops teams, marketers, anyone building dashboards from multiple sources.Developers building voice agents, phone bots, interactive apps.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • < 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
Weaknesses
  • Smaller community
  • Model selection more limited
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.S-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.
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