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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Fathom S | Perplexity S | Sora A | Claude Agent SDK S | |
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| Tagline | Meeting notes, free forever for individuals. | AI search done right. Cited answers, not chat theater. | OpenAI's video model. Long clips, cinematic quality. | Anthropic's SDK for building your own agents on Claude. |
| Category | Meetings | Research | Video | Agents |
| Pricing | Free for individuals + $15-$29/user/mo teams | Free + $20/mo Pro | Included with ChatGPT Plus/Pro | API usage + SDK is free |
| Best for | Solo operators, freelancers, small teams on a budget. | Replacing Google for any question where you want a cited answer in seconds. | ChatGPT subscribers experimenting with cinematic shots. | Developers building custom agents for their own company/product. |
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| Kai's verdict | S-tier for solo + free. The best free option, hands down. | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. | A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros. | S-tier for builders. The right primitives. What Kai is built on under the hood. |
| Link | Open → | Open → | Open → | Open → |