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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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DeepSeek
S
Grammarly
A
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Grammar check + tone + AI drafting, everywhere you type.
CategoryChatbotsWriting
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $12-$15/mo Premium + team plans
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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