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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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Groq
S
Skye
A
Julius
S
Cursor
S
TaglineThe fastest AI inference in the world. Crazy low latency.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.Chat with your data. Upload a CSV, ask questions, get charts.VS Code fork that made AI coding actually work.
CategoryDev PlatformAgentsDataCoding
PricingFree tier + pay-as-you-go APIWaitlist / Beta (pricing not yet disclosed)Free + $20-$65/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers who need sub-100ms LLM responses.iPhone power users who are frustrated that Siri is still reactive and want their home screen to actually anticipate their day.Analysts, founders, anyone with a spreadsheet + a question.Developers. Non-developers who want to ship working code.
Strengths
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • 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
  • Handles complex CSVs + spreadsheets
  • Generates real Python analysis + charts
  • No technical setup
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • 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
  • File size limits
  • Can hallucinate on messy data
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for speed. When latency is the product, start here.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.)S-tier for ad-hoc analysis. Makes you feel like a data scientist in 30 seconds.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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