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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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Chatbots
Research
Coding
Image
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Productivity
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Writing
Agents
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Data
Marketing
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Perplexity
S
Writesonic
B
Replicate
S
Reflect
A
TaglineAI search done right. Cited answers, not chat theater.SEO-first AI writer. Optimized for ranking content.Run any open-source AI model with an API call.AI-powered networked notes. Roam with a brain.
CategoryResearchMarketingDev PlatformProductivity
PricingFree + $20/mo ProFree + $15-$99/moPay per second of compute$10/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Content marketers churning out SEO articles.Developers using open-source models (Flux, SDXL, Whisper, etc).Knowledge workers + thinkers who want AI in their second brain.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive for just notes
  • Smaller community than Obsidian
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.S-tier for open-source model APIs. The default in this space.A-tier. Niche but beloved. If you've outgrown Notion, try this.
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