>Do you have examples of cool applications or demos that the HN crowd should check out?

Not OP obviously, but I've built so many applications with Claude, here are just a few:

[1]

Mockup of Utopian infrastructure support button (this is just a mockup, the buttons don't do anything): https://claude.site/artifacts/435290a1-20c4-4b9b-8731-67f5d8...

[2]

Robot body simulation: https://claude.site/artifacts/6ffd3a73-43d6-4bdb-9e08-02901d...

[3]

15-piece slider puzzle: https://claude.site/artifacts/4504269b-69e3-4b76-823f-d55b3e...

[4]

Canada joining the U.S., checklist: https://claude.site/artifacts/6e249e38-f891-4aad-bb47-2d0c81...

[5]

Secure encryption and decryption with AES-256-GCM with password-based key derivation:

https://claude.site/artifacts/cb0ac898-e5ad-42cf-a961-3c4bf8...

(Try to decrypt this message

kFIxcBVRi2bZVGcIiQ7nnS0qZ+Y+1tlZkEtAD88MuNsfCUZcr6ujaz/mtbEDsLOquP4MZiKcGeTpBbXnwvSLLbA/a2uq4QgM7oJfnNakMmGAAtJ1UX8qzA5qMh7b5gze32S5c8OpsJ8=

With the password "Hello Hacker News!!" (without quotation marks))

[6]

Supply-demand visualizer under tariffs and subsidies: https://claude.site/artifacts/455fe568-27e5-4239-afa4-051652...

[7]

fortune cookie program: https://claude.site/artifacts/d7cfa4ae-6946-47af-b538-e6f992...

[8]

Household security training for classified household members (includes self-assessment and certificate): https://claude.site/artifacts/7754dae3-a095-4f02-b4d3-26f1a5...

[9]

public service accountability training program: https://claude.site/artifacts/b89a69fb-1e46-4b5c-9e96-2c29dd...

[10]

Nuclear non-proliferation "big brother" agent technical demonstration: https://claude.site/artifacts/555d57ba-6b0e-41a1-ad26-7c90ca...

Dating stuff:

[11]

Dating help: Interest Level Assessment Game (is she interested?) https://claude.site/artifacts/523c935c-274e-4efa-8480-1e09e9...

[12]

Dating checklist: https://claude.site/artifacts/10bf8bea-36d5-407d-908a-c1e156...