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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
Kling
A
Cursor
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Grammar check + tone + AI drafting, everywhere you type.Kuaishou's video model. The surprise standout.VS Code fork that made AI coding actually work.
CategoryChatbotsWritingVideoCoding
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $12-$15/mo Premium + team plansCredit-based, free trialFree + $20/mo Pro + $40/mo Business
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Non-native English writers, business email, anyone who types a lot.Anyone who wants top-tier video quality for less.Developers. Non-developers who want to ship working code.
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
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
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)
  • UX is rough for English speakers
  • Queue times
  • Can feel overwhelming for non-coders
  • Expensive at scale
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.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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