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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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Lex
A
Perplexity
S
Taskade
B
Elicit
S
TaglineGoogle Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.AI project management with agents for each team.AI research assistant for academic literature.
CategoryWritingResearchProductivityResearch
PricingFree + $12/moFree + $20/mo ProFree + $8-$20/user/moFree + $12-$42/mo
Best forEssays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Small teams wanting AI baked into project management.Grad students, researchers, anyone doing literature reviews.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Custom AI agents per project
  • Doc + tasks + kanban in one
  • Affordable for teams
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Feature sprawl
  • AI agents need tuning to be useful
  • Academic-only
  • Can hallucinate citations — verify everything
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Solid product but crowded market. Try it if Notion AI feels too generic.S-tier for academic research. Nothing else comes close for systematic reviews.
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