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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
OpenRouter
S
Rows
A
Hume AI
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.One API, every model. Pay-as-you-go, no subscriptions.Spreadsheets with AI + live integrations baked in.Voice AI that reads + expresses emotion.
CategoryCodingDev PlatformDataVoice
PricingFree + $15/mo ProPay per token — model-dependentFree + $19-$89/user/moFree tier + pay-as-you-go
Best forDevelopers who want Cursor-like power for less money.Developers experimenting across models. Apps that want fallback logic.Ops teams, marketers, anyone building dashboards from multiple sources.Therapy apps, customer service, any voice agent where emotion matters.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
Weaknesses
  • Smaller community
  • Model selection more limited
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Niche use case
  • Pricing ramps fast
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for model-shopping. I use this for every prototype before committing.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier in its niche. The only one that actually gets emotion right.
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