Is the app paid?

Yes, once. Four decks are included. The rest are separate one-time purchases, no subscription.

I got a new phone, how do I get my packs back?

Settings → Restore purchases. Your extensions come back with the same Apple ID.

Can I keep the content milder?

Yes. Settings → Intensity → “Keep it up to”. Cards hotter than your chosen level are set aside, across every pack.

Is my data safe?

Everything stays on your iPhone. No account, no ads, no tracking.