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
Writesonic B | Perplexity S | Claude Agent SDK S | Udio A | |
|---|---|---|---|---|
| Tagline | SEO-first AI writer. Optimized for ranking content. | AI search done right. Cited answers, not chat theater. | Anthropic's SDK for building your own agents on Claude. | Suno's main rival. Often better on instrumental nuance. |
| Category | Marketing | Research | Agents | Audio |
| Pricing | Free + $15-$99/mo | Free + $20/mo Pro | API usage + SDK is free | Free + $10-$30/mo |
| Best for | Content marketers churning out SEO articles. | Replacing Google for any question where you want a cited answer in seconds. | Developers building custom agents for their own company/product. | Musicians comparing AI outputs. Anyone who didn't click with Suno. |
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| Kai's verdict | B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic. | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. | S-tier for builders. The right primitives. What Kai is built on under the hood. | A-tier. Genuinely different vibe from Suno — worth trying both for a month. |
| Link | Open → | Open → | Open → | Open → |