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
Coding
Image
Productivity
Writing
Marketing
Perplexity S | HeyGen S | Synthesia A | Reflect A | |
|---|---|---|---|---|
| Tagline | AI search done right. Cited answers, not chat theater. | AI avatar videos. Record once, speak any language. | Enterprise AI avatar video for training + comms. | AI-powered networked notes. Roam with a brain. |
| Category | Research | Video | Video | Productivity |
| Pricing | Free + $20/mo Pro | Free + $24-$65/mo | $22-$89/mo + enterprise | $10/mo |
| Best for | Replacing Google for any question where you want a cited answer in seconds. | Course creators, multilingual marketers, anyone scaling video content. | Enterprise L&D, corporate training, internal comms. | Knowledge workers + thinkers who want AI in their second brain. |
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| Kai's verdict | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. | S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code. | A-tier. HeyGen wins for creators, Synthesia wins for enterprise. | A-tier. Niche but beloved. If you've outgrown Notion, try this. |
| Link | Open → | Open → | Open → | Open → |