Got your Pesach guide? No.
Got your OU Passover guide? No.
In the grocery store with no idea whether cottage cheese needs to have a special Passover certification or not? (BTW, yes it does.)
Don't worry - there's an app for that. Or two.
I downloaded the OU's Passover app, and I also have the CRC Kosher app that has a new Passover update. I think that both are useful.
The OU app is essentially a product/category listing.
The CRC Kosher app has an FAQs section, a kashering section, and a nicely organized categorical listing.
On the whole, I think the CRC Kosher app is more developed than the OU app, but it's great to have both.
As a reminder, please confirm with your local rabbi any kosher-related concerns; the CRC and the OU are different agencies and sometimes have different answers to the same question, so the decision ultimately rests with your personal rabbi.