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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Coding
Image
Productivity
Writing
Marketing
Devin A | Perplexity S | Lex A | Adobe Firefly A | |
|---|---|---|---|---|
| Tagline | Cognition Labs' autonomous coding engineer. | AI search done right. Cited answers, not chat theater. | Google Docs with an AI collaborator baked in. | Commercially safe image gen, deeply integrated with Photoshop. |
| Category | Agents | Research | Writing | Image |
| Pricing | $500/mo | Free + $20/mo Pro | Free + $12/mo | Free + included with Creative Cloud |
| Best for | Engineering teams offloading tickets. Ops/platform work. | Replacing Google for any question where you want a cited answer in seconds. | Essays, long-form drafts, thinking on the page. | Anyone in Creative Cloud. Brands that need copyright clarity. |
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| Kai's verdict | A-tier for the right use case. Not for solo devs. If you manage engineers, try one license. | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. | A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form. | S-tier inside Photoshop (Generative Fill). B-tier standalone. |
| Link | Open → | Open → | Open → | Open → |