Will it just give me the answer?

No — deliberately. Hints come in layers and you choose how far to go. The point is to stop needing it.

Can I cancel?

Any time, from the billing portal. Access continues to the end of the period you've paid for.

Does my code get stored?

No. Credentials are stripped before anything leaves your machine, and session replays record how long your code was, never what it said.

Is this affiliated with LeetCode?

No. OmniCode works alongside those sites and only reads what's already on your screen.