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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
Perplexity
S
MagicSchool
S
Aider
A
TaglineCognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.AI platform built for teachers. Lesson plans + IEPs + admin.Terminal-based AI pair programmer. Git-aware, model-flexible.
CategoryAgentsResearchEducationCoding
Pricing$500/moFree + $20/mo ProFree + $100/yr Plus + school plansFree (open source) + whatever API you use
Best forEngineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.Teachers prepping materials. School districts.Developers who want open-source tooling with full control.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • 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
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Teacher-only focus
  • Less useful for students
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.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.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
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