A simple fluid intake and output tracker

Sometimes you just need to know how much you have had to drink today — and a notes app or a mental tally never quite holds up. Kidney Tracker is built for kidney patients but works for anyone asked to track fluids or vitals, and at its heart is a clean fluid intake and output tracker that does the counting for you. You log; it totals.

Log a drink in seconds

Recording intake should never be a chore, so the app makes it a couple of taps. Enter the amount in millilitres, and to make the everyday entries instant you can save the drink sizes you use most — a mug of tea, a small glass, a bottle. Output is logged the same way, kept in its own column. Each entry is timestamped, so nothing is guessed at later.

Running totals and your own target

The Today screen keeps a live total of your intake and your output, and shows the net for the day. If you want a figure to aim for, you can set your own daily target — a number you choose — and the screen shows how much of it is left. The app never sets a target for you or tells you what it should be; it simply totals what you log against the number you entered.

Log without opening the app

The best tracker is the one you actually use, so logging is built into the places you already glance at. A Home-Screen widget shows today's total at a tap, an Apple Watch complication keeps it on your wrist, and Siri lets you add a drink by voice. Fewer steps means fewer forgotten entries, which keeps the running total honest.

See the pattern over time

A single day is useful, but the picture across a week or a month is often more telling. Every day's totals are kept and plotted on a chart, and you can scroll back through your history to any date to see exactly what was logged and when. When you need to share it, a printable report turns your records into a clean summary you can print or send.

Yours, and private

There is no account and no sign-up, and nothing is uploaded. Everything you log lives in a database on your own iPhone, with no analytics and no advertising, so the only person looking at your numbers is you. If you ever want more than fluid, the same app can also record weight, blood pressure, medications with reminders and blood results — all in the same private place.

Kidney Tracker is a personal record-keeping tool. It is not a medical device and does not provide medical advice — always follow your own clinical team.