Actually to be fair I'm not sure they work alerting for block finding since ckpool went solo.

But the apps I know of that work with ckpool are:

Apple: Ckpool Stats - https://apps.apple.com/gb/app/ckpool-stats/id1076177533
Android: CheckPool - https://play.google.com/store/apps/details?id=com.alexdib.miningpoolmonitor

I've never found a solo block here so tbh I don't know if they do what you want. But some others have come up with good solutions based on wallet alerts.

If you want to do wallet alerts, you can also use Sentinel on Android https://play.google.com/store/apps/details?id=com.samourai.sentinel