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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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OpenRouter
S
Cline
A
Rows
A
Windsurf
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Open-source VS Code agent. Reads + writes + runs.Spreadsheets with AI + live integrations baked in.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryDev PlatformCodingDataCoding
PricingPay per token — model-dependentFree (open source) + your API costsFree + $19-$89/user/moFree + $15/mo Pro
Best forDevelopers experimenting across models. Apps that want fallback logic.VS Code users who want agentic coding without changing IDEs.Ops teams, marketers, anyone building dashboards from multiple sources.Developers who want Cursor-like power for less money.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Smaller community
  • Model selection more limited
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. Best free agentic option in VS Code. Use with Claude for best results.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier. Close second to Cursor. If $5/mo matters, start here.
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