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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
Cursor
S
Claude Agent SDK
S
Genspark
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.VS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.AI agent for deep search. Generates Sparkpages — full mini-reports.
Categorycodingcodingagentsresearch
PricingFree + $15/mo ProFree + $20/mo Pro + $40/mo BusinessAPI usage + SDK is freeFree + $25/mo Plus
Best forDevelopers who want Cursor-like power for less money.Developers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.Travel planning, shopping comparisons, deep research where you want an artifact back.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Sparkpages = curated multi-source mini-articles
  • Agent can book, compare, shop
  • Autopilot agent for long tasks
Weaknesses
  • Smaller community
  • Model selection more limited
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
  • Early-stage — rough edges
  • Less reliable than Perplexity for simple questions
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for builders. The right primitives. What Kai is built on under the hood.A-tier. Bet on this one — the Sparkpage format is genuinely new.
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