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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
Runway
S
Perplexity
S
Duolingo Max
A
TaglineCognition Labs' autonomous coding engineer.The pro's AI video tool. Gen-4 is the current bar.AI search done right. Cited answers, not chat theater.Duolingo + AI. Explain My Answer + Roleplay features.
CategoryAgentsVideoResearchEducation
Pricing$500/moFree + $15-$95/moFree + $20/mo Pro$30/mo (or ~$168/yr)
Best forEngineering teams offloading tickets. Ops/platform work.Marketing video, pitch decks, b-roll, creative shorts.Replacing Google for any question where you want a cited answer in seconds.Language learners who've outgrown basic Duolingo.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Expensive at scale
  • Still needs post-editing
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier. Market leader with reason. Start here for serious video.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.
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