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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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S
Cursor
S
Skye
A
Windsurf
A
TaglineRun any open-source AI model with an API call.VS Code fork that made AI coding actually work.An agentic iPhone home screen that replaces your static icon grid with AI widgets that proactively surface health, calendar, finance, and local context — without you having to open a single app.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryDev PlatformCodingAgentsCoding
PricingPay per second of computeFree + $20/mo Pro + $40/mo BusinessWaitlist / Beta (pricing not yet disclosed)Free + $15/mo Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers. Non-developers who want to ship working code.iPhone power users who are frustrated that Siri is still reactive and want their home screen to actually anticipate their day.Developers who want Cursor-like power for less money.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Ambient, proactive intelligence delivered via native iOS widgets — no app-switching required
  • Cross-domain context: health, calendar, email, finances, and local recommendations in one layer
  • Works within iOS permission model (no jailbreak or sideloading), making App Store approval plausible
  • Strong pre-launch signal: 25k+ waitlist and backing from a16z, True Ventures, and SV Angel
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Still pre-launch / beta — zero proven track record and no public pricing yet
  • iPhone-only by design, which immediately locks out half the smartphone market
  • Battery drain and privacy concerns from constant ambient context scanning are real and unresolved
  • Smaller community
  • Model selection more limited
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.The concept is genuinely compelling — turning the home screen into a living AI layer is a smarter bet than yet another chat interface — but this is vaporware until it ships publicly and we see whether Apple's sandbox lets it breathe. (Verdict pending Phi's full review.)A-tier. Close second to Cursor. If $5/mo matters, start here.
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