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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
Sudowrite
S
Taskade
B
Perplexity
S
TaglineGoogle Docs with an AI collaborator baked in.AI writing tool built specifically for fiction writers.AI project management with agents for each team.AI search done right. Cited answers, not chat theater.
CategoryWritingWritingProductivityResearch
PricingFree + $12/mo$19-$59/moFree + $8-$20/user/moFree + $20/mo Pro
Best forEssays, long-form drafts, thinking on the page.Novelists, screenwriters, fiction short-form writers.Small teams wanting AI baked into project management.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • Custom AI agents per project
  • Doc + tasks + kanban in one
  • Affordable for teams
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Feature sprawl
  • AI agents need tuning to be useful
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.B-tier. Solid product but crowded market. Try it if Notion AI feels too generic.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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