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, with the time, for the 3–7 day diary your doctor asked for, and turns it into a PDF report. No account, nothing leaves your phone.
Easier than paper, in three ways.
No rewriting
Made a mistake? Fix the entry in place. No copying the whole day out again.
The maths is done 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. Change the time or add a note when you need to. Works from the Home Screen widget and Apple Watch too.
A report your doctor can read.
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?
- 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.
Nothing to fill in 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 daily reminder 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: by day, by hour, night-time trips, volume spread and gaps between voids. The first chart is free.
One diary, every screen.
Two taps from the Home Screen, the Lock Screen or your wrist. Full iPad support is on its way.
Home Screen widget
IN, OUT and BALANCE at a glance, and two buttons to log.
Apple Watch
The same presets on your wrist, Not measured included.
iPad Coming soon
Bigger screen, same two taps. For now it runs as an iPhone app, synced through your own iCloud.
Lock Screen widget
Today's totals and the buttons, 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.
The diary takes a few days. Start tonight.
Free, no account, nothing to set up. The first entry is two taps.
