Few conditions depend so much on what goes on the plate. And few have rules so hard to carry in your head, because what is healthy in general may not be healthy here. Cognia puts it in front of you food by food.
This is the condition where it shows most clearly why the app looks at your case and not at a generic table: there are foods everyone recommends that here need care because of their potassium or phosphorus. The traffic light tells you with its reason and its source, and leaves the decision to you.
Boiling and discarding the water lowers the potassium of many vegetables and tubers; the same food baked or steamed keeps it. The app records how you prepared it, because boiled and baked are not the same food for this purpose.
Creatinine, eGFR, potassium, phosphorus, albumin: log them and see them over time. A trend says far more than a single day, and a trend is what gets reviewed at the appointment.
Schedules with reminders and history, and a warning when a supplement does not suit your kidney function. Many over-the-counter products are not neutral here, and it is worth knowing beforehand.