There are a few apps out there. I prefer to use MyFitnessPal (although you cant fully adjust it to be perfect for Keto unless you pay the membership, it will get you close)
- Macro Calculators
- Android Apps (sorry I am not an iPad/pod/phone user)
- https://play.google.com/store/apps/details?id=com.gatoapps.ketogenicdiet&hl=en – There are a ton of apps out there. You may just have to use trial and error. One I can tell you for sure I didn’t like was this one. It just confused me but maybe it will do better for you!