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Elicit
S
Lex
A
Perplexity
S
Replicate
S
TaglineAI research assistant for academic literature.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.Run any open-source AI model with an API call.
CategoryResearchWritingResearchDev Platform
PricingFree + $12-$42/moFree + $12/moFree + $20/mo ProPay per second of compute
Best forGrad students, researchers, anyone doing literature reviews.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • 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
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Academic-only
  • Can hallucinate citations — verify everything
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for academic research. Nothing else comes close for systematic reviews.A-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.S-tier for open-source model APIs. The default in this space.
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