Artifacts (available during claude.ai builds or directly through https://claude.ai/artifacts) previously integrated into the Claude interface via Canva (see Artifacts in Claude 3.5 Sonnet) have been vastly improved with Claude Sonnet 4 and now have their own space.

Several pre-formatted build types are offered with gallery for inspiration.
Generate in tsx format from an instruction and hosting public directly on claude.ai

Free with a limited number of interactions renewed every 5 hours.

Multiplication farm: https://claude.ai/public/artifacts/04b821fb-f7a9-4860-bf05-7d9b45667637

The Secret Passage: https://claude.ai/public/artifacts/cebdc42c-724d-4263-8dce-d6df88963900