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.Pick tools (4 selected)
coding
image
productivity
writing
marketing
Perplexity S | Runway S | GitHub Copilot B | Writesonic B | |
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| Tagline | AI search done right. Cited answers, not chat theater. | The pro's AI video tool. Gen-4 is the current bar. | Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration. | SEO-first AI writer. Optimized for ranking content. |
| Category | research | video | coding | marketing |
| Pricing | Free + $20/mo Pro | Free + $15-$95/mo | Free (limited) + $10/mo Pro + $19/mo Business | Free + $15-$99/mo |
| Best for | Replacing Google for any question where you want a cited answer in seconds. | Marketing video, pitch decks, b-roll, creative shorts. | Teams with GitHub already. Devs who don't want to change IDEs. | Content marketers churning out SEO articles. |
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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. Market leader with reason. Start here for serious video. | B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't. | B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic. |
| Link | Open → | Open → | Open → | Open → |