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ChatGPT, Claude, Grok—best-for notes and open guides. No login.

ChatGPT

Everyday drafting, multimodal, broad toolkit. Skills / agents / MCP: Learn → System track.

Claude

Long docs, careful polish, code review. Skills / agents / MCP: Learn → System track.

Grok

Live public conversation, informal angles—verify before you share. For skills / agents / MCP, see Learn → System track (e.g. What is a skill?, MCP in plain words).

Catalog: 119 open guides · full list also on Learn.

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