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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Replicate S | HeyGen S | Hex A | Midjourney S | |
|---|---|---|---|---|
| Tagline | Run any open-source AI model with an API call. | AI avatar videos. Record once, speak any language. | Modern data notebook with Magic AI assistant. | The aesthetic gold standard for AI image generation. |
| Category | Dev Platform | Video | Data | Image |
| Pricing | Pay per second of compute | Free + $24-$65/mo | Free + $28+/user/mo | $10-$120/mo |
| Best for | Developers using open-source models (Flux, SDXL, Whisper, etc). | Course creators, multilingual marketers, anyone scaling video content. | Data teams at startups + enterprises. | Anyone who wants beautiful images without thinking about prompts. |
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| Kai's verdict | S-tier for open-source model APIs. The default in this space. | S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code. | A-tier for data teams. S-tier if you already live in SQL + Python. | S-tier for aesthetics. If you care how it looks more than how it's made, this wins. |
| Link | Open → | Open → | Open → | Open → |