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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
Perplexity
S
Groq
S
TaglineGrammar check + tone + AI drafting, everywhere you type.AI search done right. Cited answers, not chat theater.The fastest AI inference in the world. Crazy low latency.
CategoryWritingResearchDev Platform
PricingFree + $12-$15/mo Premium + team plansFree + $20/mo ProFree tier + pay-as-you-go API
Best forNon-native English writers, business email, anyone who types a lot.Replacing Google for any question where you want a cited answer in seconds.Developers who need sub-100ms LLM responses.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
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 search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for speed. When latency is the product, start here.
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