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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Devin A | Rows A | NotebookLM S | Hume AI A | |
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| Tagline | Cognition Labs' autonomous coding engineer. | Spreadsheets with AI + live integrations baked in. | Google's research notebook. Turns your docs into a podcast. | Voice AI that reads + expresses emotion. |
| Category | Agents | Data | Research | Voice |
| Pricing | $500/mo | Free + $19-$89/user/mo | Free | Free tier + pay-as-you-go |
| Best for | Engineering teams offloading tickets. Ops/platform work. | Ops teams, marketers, anyone building dashboards from multiple sources. | Students, researchers, anyone with a stack of PDFs or a topic to learn. | Therapy apps, customer service, any voice agent where emotion matters. |
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| Kai's verdict | A-tier for the right use case. Not for solo devs. If you manage engineers, try one license. | 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. | A-tier in its niche. The only one that actually gets emotion right. |
| Link | Open → | Open → | Open → | Open → |