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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
Cursor
S
Perplexity
S
TaglineGrammar check + tone + AI drafting, everywhere you type.The fastest AI inference in the world. Crazy low latency.VS Code fork that made AI coding actually work.AI search done right. Cited answers, not chat theater.
CategoryWritingDev PlatformCodingResearch
PricingFree + $12-$15/mo Premium + team plansFree tier + pay-as-you-go APIFree + $20/mo Pro + $40/mo BusinessFree + $20/mo Pro
Best forNon-native English writers, business email, anyone who types a lot.Developers who need sub-100ms LLM responses.Developers. Non-developers who want to ship working code.Replacing Google for any question where you want a cited answer in seconds.
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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
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
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Not a general chatbot
  • Answers can be shallow on complex topics
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 coding. If you write code of any kind, this pays back the $20 in a day.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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