Compare AI tools
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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Perplexity S | Grammarly A | Rows A | NotebookLM S | |
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| Tagline | AI search done right. Cited answers, not chat theater. | Grammar check + tone + AI drafting, everywhere you type. | Spreadsheets with AI + live integrations baked in. | Google's research notebook. Turns your docs into a podcast. |
| Category | Research | Writing | Data | Research |
| Pricing | Free + $20/mo Pro | Free + $12-$15/mo Premium + team plans | Free + $19-$89/user/mo | Free |
| Best for | Replacing Google for any question where you want a cited answer in seconds. | Non-native English writers, business email, anyone who types a lot. | Ops teams, marketers, anyone building dashboards from multiple sources. | Students, researchers, anyone with a stack of PDFs or a topic to learn. |
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| Kai's verdict | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. | A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone. | A-tier. The most interesting spreadsheet in years. Great for ops dashboards. | S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs. |
| Link | Open → | Open → | Open → | Open → |