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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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Dev Platform
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Video
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Devin
A
Grammarly
A
Framer
A
DeepSeek
S
TaglineCognition Labs' autonomous coding engineer.Grammar check + tone + AI drafting, everywhere you type.Design + publish sites with AI assists built in.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
CategoryAgentsWritingDesignChatbots
Pricing$500/moFree + $12-$15/mo Premium + team plansFree + $5-$30/moFree web + ultra-cheap API (~$0.14/M input tokens)
Best forEngineering teams offloading tickets. Ops/platform work.Non-native English writers, business email, anyone who types a lot.Designers shipping marketing sites without engineers.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • AI generates sections + copy + layouts
  • Designer-first publishing (not just templates)
  • Great animations
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less flexible than raw code
  • Pricing per-site adds up
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier for designer-led sites. S-tier if animations matter.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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