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 | Sudowrite S | Replicate S | ChatGPT Operator B | |
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| Tagline | Meeting notes, free forever for individuals. | AI writing tool built specifically for fiction writers. | Run any open-source AI model with an API call. | OpenAI's browser agent. Clicks and types on websites for you. |
| Category | Meetings | Writing | Dev Platform | Agents |
| Pricing | Free for individuals + $15-$29/user/mo teams | $19-$59/mo | Pay per second of compute | Included with ChatGPT Pro $200/mo |
| Best for | Solo operators, freelancers, small teams on a budget. | Novelists, screenwriters, fiction short-form writers. | Developers using open-source models (Flux, SDXL, Whisper, etc). | Power users willing to pay $200/mo for a browser bot. |
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| Kai's verdict | S-tier for solo + free. The best free option, hands down. | S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time. | S-tier for open-source model APIs. The default in this space. | B-tier. Still early. Manus is more flexible for less money. |
| Link | Open → | Open → | Open → | Open → |