Claude.ai
Anthropic's consumer chat product running the Claude family (Haiku, Sonnet, Opus).
- Projects, Artifacts, Memory features.
- Tiers: Free, Pro, Max, Team, Enterprise.
- 200K-1M token context suits long docs and large codebases.
When to use: For long-form writing, document review, and code reasoning over big files.
Example: Claude Projects: upload style guide and PRD once; every chat in that project loads them automatically.