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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Dev Platform
Agents
Video
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Productivity
Writing
Marketing
Hex A | Reflect A | OpenAI Voice / Realtime S | |
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| Tagline | Modern data notebook with Magic AI assistant. | AI-powered networked notes. Roam with a brain. | ChatGPT's voice + the Realtime API for developers. |
| Category | Data | Productivity | Voice |
| Pricing | Free + $28+/user/mo | $10/mo | Voice included with ChatGPT Plus; Realtime API by usage |
| Best for | Data teams at startups + enterprises. | Knowledge workers + thinkers who want AI in their second brain. | Voice chat users, developers building voice agents on OpenAI. |
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| Kai's verdict | A-tier for data teams. S-tier if you already live in SQL + Python. | A-tier. Niche but beloved. If you've outgrown Notion, try this. | S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement. |
| Link | Open → | Open → | Open → |