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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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Reflect
A
Grammarly
A
Perplexity
S
TaglineAI-powered networked notes. Roam with a brain.Grammar check + tone + AI drafting, everywhere you type.AI search done right. Cited answers, not chat theater.
CategoryProductivityWritingResearch
Pricing$10/moFree + $12-$15/mo Premium + team plansFree + $20/mo Pro
Best forKnowledge workers + thinkers who want AI in their second brain.Non-native English writers, business email, anyone who types a lot.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • 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
Weaknesses
  • Expensive for just notes
  • Smaller community than Obsidian
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. Niche but beloved. If you've outgrown Notion, try this.A-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.
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