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
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Productivity
Writing
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Devin A | ChatGPT Operator B | Cursor S | Bolt.new (StackBlitz) A | |
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| Tagline | Cognition Labs' autonomous coding engineer. | OpenAI's browser agent. Clicks and types on websites for you. | VS Code fork that made AI coding actually work. | Prompt to deployed full-stack app in the browser. |
| Category | Agents | Agents | Coding | Coding |
| Pricing | $500/mo | Included with ChatGPT Pro $200/mo | Free + $20/mo Pro + $40/mo Business | Free + $20-$200/mo |
| Best for | Engineering teams offloading tickets. Ops/platform work. | Power users willing to pay $200/mo for a browser bot. | Developers. Non-developers who want to ship working code. | PMs, founders, non-devs shipping MVPs. |
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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. | B-tier. Still early. Manus is more flexible for less money. | S-tier for coding. If you write code of any kind, this pays back the $20 in a day. | A-tier. Best for fast prototypes. Competitive with Lovable — try both. |
| Link | Open → | Open → | Open → | Open → |