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 | NeuralSet A | Fathom S | Cursor S | |
|---|---|---|---|---|
| Tagline | AI search done right. Cited answers, not chat theater. | Meta FAIR's open-source Python library that finally bridges the gap between neuroimaging data (fMRI, EEG, spikes) and modern deep learning pipelines. | Meeting notes, free forever for individuals. | VS Code fork that made AI coding actually work. |
| Category | Research | Research | Meetings | Coding |
| Pricing | Free + $20/mo Pro | Free (MIT open source) | Free for individuals + $15-$29/user/mo teams | Free + $20/mo Pro + $40/mo Business |
| Best for | Replacing Google for any question where you want a cited answer in seconds. | Computational neuroscience researchers who want to train deep learning models on brain recordings without building custom data pipelines from scratch. | Solo operators, freelancers, small teams on a budget. | Developers. Non-developers who want to ship working code. |
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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. | If you're doing neuro-AI research, this is the plumbing you've been manually building for years — finally done right by the team that actually runs these experiments at scale. Extremely narrow use case, but within that lane it looks genuinely best-in-class. (Verdict pending Phi's full review.) | S-tier for solo + free. The best free option, hands down. | S-tier for coding. If you write code of any kind, this pays back the $20 in a day. |
| Link | Open → | Open → | Open → | Open → |