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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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Writesonic
B
Replicate
S
Gemini
A
TaglineSEO-first AI writer. Optimized for ranking content.Run any open-source AI model with an API call.Google's answer. Best integrated with Workspace + free for a lot.
Categorymarketingdev platformchat
PricingFree + $15-$99/moPay per second of computeFree + $20/mo Advanced (bundled with 2TB Drive)
Best forContent marketers churning out SEO articles.Developers using open-source models (Flux, SDXL, Whisper, etc).Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • 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
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictB-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. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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