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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
Kling
A
Gemini
A
Perplexity
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Kuaishou's video model. The surprise standout.Google's answer. Best integrated with Workspace + free for a lot.AI search done right. Cited answers, not chat theater.
CategoryWritingVideoChatbotsResearch
PricingFree + $12-$15/mo Premium + team plansCredit-based, free trialFree + $20/mo Advanced (bundled with 2TB Drive)Free + $20/mo Pro
Best forNon-native English writers, business email, anyone who types a lot.Anyone who wants top-tier video quality for less.Anyone already on Google, research tasks, summarizing long documents.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
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • 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)
  • UX is rough for English speakers
  • Queue times
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • 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.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.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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