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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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DeepSeek
S
Windsurf
A
GitHub Copilot
B
Reflect
A
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Codeium's agentic IDE. Cascade agent + strong free tier.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI-powered networked notes. Roam with a brain.
Categorychatcodingcodingproductivity
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $15/mo ProFree (limited) + $10/mo Pro + $19/mo Business$10/mo
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers who want Cursor-like power for less money.Teams with GitHub already. Devs who don't want to change IDEs.Knowledge workers + thinkers who want AI in their second brain.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Smaller community
  • Model selection more limited
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Expensive for just notes
  • Smaller community than Obsidian
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier. Close second to Cursor. If $5/mo matters, start here.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Niche but beloved. If you've outgrown Notion, try this.
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