Claude.ai
Claude.ai is the hosted chat product — web app, desktop apps (macOS · Windows), iOS app. Two of its features are worth a dossier each: Projects (long-lived context with files + custom instructions) and Skills (custom callable tools you write once and reuse across chats). Plus an integrated Computer Use surface. Honest take: the free tier limits are tight; the Pro tier is generous for individuals but the Team/Enterprise tiers have very different feature flags — read the pricing page carefully before assuming what you can use.
- WEB.1 Claude.ai — the hosted chat product, plainly sourced
What Claude.ai is, the surfaces it ships on (web · desktop · iOS), what the tiers actually unlock, and how it relates to Claude Code, the API, and the Anthropic Console. Plus the privacy posture in plain terms.
- WEB.2 Claude.ai Projects — long-lived context with files sourced
Projects are Claude.ai's headline paid-tier feature — long-running conversations with attached files, custom instructions, and consistent context across sessions. What they're good for, how to set one up well, where the limits bite.
- WEB.3 Claude.ai Skills — Markdown instruction packs Claude loads on demand sourced
Skills are Markdown instruction folders (SKILL.md plus optional scripts and resources) that Claude reads dynamically to do specialised tasks better. Available on paid Claude.ai plans. What they are, how they're created, the Skills Directory, and how they differ from Projects and MCP.