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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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Khanmigo
S
Gemini
A
Perplexity
S
NotebookLM
S
TaglineKhan Academy's AI tutor. Socratic method, built for learning.Google's answer. Best integrated with Workspace + free for a lot.AI search done right. Cited answers, not chat theater.Google's research notebook. Turns your docs into a podcast.
CategoryEducationChatbotsResearchResearch
Pricing$4/mo (free for teachers)Free + $20/mo Advanced (bundled with 2TB Drive)Free + $20/mo ProFree
Best forStudents K-12. Parents helping with homework. Teachers prepping lessons.Anyone already on Google, research tasks, summarizing long documents.Replacing Google for any question where you want a cited answer in seconds.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Socratic — doesn't give answers, asks questions
  • Trusted by schools + parents
  • Integrated with Khan Academy curriculum
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • K-12 focus (not deep for adults)
  • Slower than general chatbots
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Google-only
  • Can be slow on large corpora
Kai's verdictS-tier for kids learning. The tutoring UX is legit — not a generic chatbot dressed up.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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