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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
Cursor
S
Grammarly
A
Runway
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.VS Code fork that made AI coding actually work.Grammar check + tone + AI drafting, everywhere you type.The pro's AI video tool. Gen-4 is the current bar.
CategoryChatbotsCodingWritingVideo
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $20/mo Pro + $40/mo BusinessFree + $12-$15/mo Premium + team plansFree + $15-$95/mo
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers. Non-developers who want to ship working code.Non-native English writers, business email, anyone who types a lot.Marketing video, pitch decks, b-roll, creative shorts.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Expensive at scale
  • Still needs post-editing
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier. Market leader with reason. Start here for serious video.
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