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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
Lex
A
Fathom
S
Perplexity
S
TaglineThe fastest AI inference in the world. Crazy low latency.Google Docs with an AI collaborator baked in.Meeting notes, free forever for individuals.AI search done right. Cited answers, not chat theater.
CategoryDev PlatformWritingMeetingsResearch
PricingFree tier + pay-as-you-go APIFree + $12/moFree for individuals + $15-$29/user/mo teamsFree + $20/mo Pro
Best forDevelopers who need sub-100ms LLM responses.Essays, long-form drafts, thinking on the page.Solo operators, freelancers, small teams on a budget.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Bot-joining model
  • Team features gated
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for speed. When latency is the product, start here.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for solo + free. The best free option, hands down.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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