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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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Grammarly
A
Sora
A
Ollama
S
Windsurf
A
TaglineGrammar check + tone + AI drafting, everywhere you type.OpenAI's video model. Long clips, cinematic quality.Run LLMs locally. One-line install, GUI optional.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryWritingVideoDev PlatformCoding
PricingFree + $12-$15/mo Premium + team plansIncluded with ChatGPT Plus/ProFree + open sourceFree + $15/mo Pro
Best forNon-native English writers, business email, anyone who types a lot.ChatGPT subscribers experimenting with cinematic shots.Devs wanting offline/local LLMs for privacy or experimentation.Developers who want Cursor-like power for less money.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Smaller community
  • Model selection more limited
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier for local inference. If you care about privacy or want to tinker, install this today.A-tier. Close second to Cursor. If $5/mo matters, start here.
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