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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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Coding
Agents
Research
Chatbots
Image
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Dev Platform
Data
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Manus
S
Lex
A
Sudowrite
S
Perplexity
S
TaglineAutonomous AI agent that actually finishes tasks.Google Docs with an AI collaborator baked in.AI writing tool built specifically for fiction writers.AI search done right. Cited answers, not chat theater.
CategoryAgentsWritingWritingResearch
PricingFree tier + $39-$199/moFree + $12/mo$19-$59/moFree + $20/mo Pro
Best forPeople who want to hand off tasks entirely — trip planning, research, spreadsheet building.Essays, long-form drafts, thinking on the page.Novelists, screenwriters, fiction short-form writers.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • 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
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier in the agent category. The first one I'd give to a non-technical friend.A-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.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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