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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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Grammarly
A
Groq
S
Perplexity
S
Cursor
S
TaglineGrammar check + tone + AI drafting, everywhere you type.The fastest AI inference in the world. Crazy low latency.AI search done right. Cited answers, not chat theater.VS Code fork that made AI coding actually work.
CategoryWritingDev PlatformResearchCoding
PricingFree + $12-$15/mo Premium + team plansFree tier + pay-as-you-go APIFree + $20/mo ProFree + $20/mo Pro + $40/mo Business
Best forNon-native English writers, business email, anyone who types a lot.Developers who need sub-100ms LLM responses.Replacing Google for any question where you want a cited answer in seconds.Developers. Non-developers who want to ship working code.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for speed. When latency is the product, start here.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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