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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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Replicate
S
Pika
A
Perplexity
S
Lex
A
TaglineRun any open-source AI model with an API call.The playful, accessible AI video tool.AI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.
CategoryDev PlatformVideoResearchWriting
PricingPay per second of computeFree + $8-$58/moFree + $20/mo ProFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Social media creators, beginners, anyone wanting quick fun clips.Replacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for social/casual. B-tier for serious work. Good entry point.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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