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.
Pick tools (3 selected)
Coding
Image
Productivity
Writing
Marketing
NotebookLM S | HeyGen S | Copy.ai A | |
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| Tagline | Google's research notebook. Turns your docs into a podcast. | AI avatar videos. Record once, speak any language. | AI GTM platform. Workflows for sales + marketing ops. |
| Category | Research | Video | Marketing |
| Pricing | Free | Free + $24-$65/mo | Free + $49-$249/mo |
| Best for | Students, researchers, anyone with a stack of PDFs or a topic to learn. | Course creators, multilingual marketers, anyone scaling video content. | RevOps + marketing ops automating repetitive tasks. |
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| Kai's verdict | S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs. | S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code. | A-tier for ops automation. B-tier for simple copy (use Claude). |
| Link | Open → | Open → | Open → |