andApple Watch
Your doctor
asked for a bladder diary.
Keep it in two taps.
Bladder Diary: Fluid Balance is a free iPhone and Apple Watch app that records what you drink and what you pass, and suits the 3–7 day diary your doctor asked for: the entries turn into a PDF report. No account, your data stays on your phone.
Easier than keeping a paper diary.
Easy to correct
Made a mistake? Fix the entry in place. No copying the whole day out again.
It counts for you
Daily totals, averages and night counts add up as you go. No sums on the back of the sheet, no Notes, no spreadsheet.
Always in your pocket
Your phone is already with you. Two taps, and the entry is saved with the time.
Need a paper version anyway? Free printable template
Tap. Tap. Done.
Tap + Intake or + Output
Two buttons at the bottom of the screen. Nothing else to choose.
Tap a preset
100, 200, 250, 330 or 500 ml. Or Custom, when you have an exact number.
That's the entry
Saved with the time. No forms, no countdowns, no confirmations.
Not sure of the volume? Tap Not measured — the time still counts. If your doctor asks how strong the urge was, turn on the urge rating and tap 0 to 4 on the same sheet. Change the time or add a note when you need to. Works from the Home Screen widget and Apple Watch too.
A report that suits your doctor.
Totals, averages and night-time trips, already worked out and laid out the way urologists read a voiding diary.
- Daily totals and every voided volume
- Night-time trips, counted the way a urologist counts them
- Days recorded, right in the summary, so the doctor sees how complete the diary is. How many days is enough?
- Urge ratings next to their entries, if you turned them on
- Print it, email it, or show it on your phone
Free and Pro. Logging, Stats, widgets, Apple Watch, iCloud and CSV export are free. Pro adds the PDF report and Advanced analytics, one-time purchase, no subscription. No upgrade prompts while you log.
No data is collected about you.
No account
No sign-up, no name, no birthdate. Open the app and start.
Data Not Collected
That's the privacy label on the App Store, not a promise. There is no server to send anything to.
A reminder that keeps quiet
The optional reminder comes only on days with no entries, and never says what the app is for. Off by default.
Your weeks at a glance.
The last five weeks as a grid: days with a diary, days without. Tap a day to open it.
No scores, no norms. Only what you recorded.
Advanced analytics, in Pro, adds five charts, each with its own range: intake and output, voids per day, night voids by night, time between voids, and through the day. The first one is free.
One diary, every screen.
Two taps from the Home Screen, the Lock Screen or your wrist, and a layout of its own on iPhone Duo. Full iPad support is on its way.
Home Screen widget
IN, OUT and BALANCE at a glance, and two buttons to log.
Apple Watch
Log straight from the watch: the same presets and Not measured, no need to take the phone out.
iPad Coming soon
A full iPad version is in the works — coming to you soon.
Lock Screen widget
Today's totals under the clock, without unlocking the phone.
Kept for 
nocturia · 
overactive bladder · 
incontinence · 
UTI follow-up · 
prostate — before and after surgery, and anyone asked to keep a bladder diary.
How to keep the diary, in plain words.
Written by the app developer, not a doctor, but every article carries its sources, carefully listed at the end.
GuidePaper bladder diary vs app: what the studies say
Compliance, memory and accuracy in paper versus electronic diaries, what app reviews found lacking, and how to choose without switching halfway through.
GuideBladder diary for overactive bladder and leaks: what to write down
Urgency, leaks, pads and what you were doing: how clinic forms ask for them, how to score them the same way every time, and where they go in a plain diary.
GuideBladder diary for nocturia: how to record night-time trips
A nocturia diary: where the night starts and ends, how the first morning void is counted, and what to write down so your doctor can read the night pattern.It is very simple — start today.
Free, no account. The first entry is two taps.
