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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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Meetings
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Productivity
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Dev Platform
Data
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Perplexity
S
Manus
S
Lex
A
Sudowrite
S
TaglineAI search done right. Cited answers, not chat theater.Autonomous AI agent that actually finishes tasks.Google Docs with an AI collaborator baked in.AI writing tool built specifically for fiction writers.
CategoryResearchAgentsWritingWriting
PricingFree + $20/mo ProFree tier + $39-$199/moFree + $12/mo$19-$59/mo
Best forReplacing Google for any question where you want a cited answer in seconds.People 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.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 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
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • 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
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-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.
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