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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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Devin
A
Grammarly
A
Ollama
S
TaglineCognition Labs' autonomous coding engineer.Grammar check + tone + AI drafting, everywhere you type.Run LLMs locally. One-line install, GUI optional.
CategoryAgentsWritingDev Platform
Pricing$500/moFree + $12-$15/mo Premium + team plansFree + open source
Best forEngineering teams offloading tickets. Ops/platform work.Non-native English writers, business email, anyone who types a lot.Devs wanting offline/local LLMs for privacy or experimentation.
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
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
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.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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