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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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Dev Platform
Agents
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Video
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Research
Coding
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Image
Meetings
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Data
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Devin
A
Lex
A
Perplexity
S
MagicSchool
S
TaglineCognition Labs' autonomous coding engineer.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.AI platform built for teachers. Lesson plans + IEPs + admin.
CategoryAgentsWritingResearchEducation
Pricing$500/moFree + $12/moFree + $20/mo ProFree + $100/yr Plus + school plans
Best forEngineering teams offloading tickets. Ops/platform work.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Teachers prepping materials. School districts.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 60+ teacher-specific tools
  • Generous free tier
  • FERPA + COPPA compliant for schools
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Teacher-only focus
  • Less useful for students
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for teachers. If you teach K-12, start here this week.
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