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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Hex A | Fathom S | NotebookLM S | Devin A | |
|---|---|---|---|---|
| Tagline | Modern data notebook with Magic AI assistant. | Meeting notes, free forever for individuals. | Google's research notebook. Turns your docs into a podcast. | Cognition Labs' autonomous coding engineer. |
| Category | Data | Meetings | Research | Agents |
| Pricing | Free + $28+/user/mo | Free for individuals + $15-$29/user/mo teams | Free | $500/mo |
| Best for | Data teams at startups + enterprises. | Solo operators, freelancers, small teams on a budget. | Students, researchers, anyone with a stack of PDFs or a topic to learn. | Engineering teams offloading tickets. Ops/platform work. |
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| Kai's verdict | A-tier for data teams. S-tier if you already live in SQL + Python. | S-tier for solo + free. The best free option, hands down. | S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs. | A-tier for the right use case. Not for solo devs. If you manage engineers, try one license. |
| Link | Open → | Open → | Open → | Open → |