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v1.0 · iOS

Personal uroflowmetry

Know your flow.

Measure your urine voids. Track your trends. Understand what your body is telling you — all on your own terms, in your own iPhone, on your own time, privately.

iOS 17+ No account On-device only
Why FlowZB exists

Your bladder data belongs to you.

A clinical uroflow test lasts about two minutes, happens once every few months, and measures you on a day when you may or may not be representative of your normal.

If you're managing BPH or a voiding condition, the flow test snapshot during your appointment tells an incomplete story.

Your bladder varies with hydration, time of day, stress, medication timing, and dozens of other factors a single clinic visit can't capture.

I built FlowZB from my personal journey with exactly this frustration. FlowZB gives you a longitudinal record of your own voiding — measured at home, on your schedule, in your own conditions — so that when you do see your urologist, you bring real data to the conversation.

It's not a diagnostic tool. It's your personal record of how your bladder behaves over time — something no clinic visit can give you.

FlowZB works with a standard Bluetooth scale as an interim measuring device, or in the future with our dedicated flow sensor currently in development — for more detailed measurement. Either way, your data stays on your mobile device.

The app is designed for people who want to understand their own bodies. It's a private tool that helps you see your progress at whatever pace you want.

The two pictures same person · 6 months
Clinic visit N=1
12.3 mL/s
With FlowZB N=178
Snapshot: one number Record: a trajectory
FlowZB session analysis
Three ways to log a session

Use whatever you already have. FlowZB adapts to the hardware in front of you.

01 — Measured

Bluetooth BLE Scale

Available now

Connect a Bluetooth kitchen scale (Bookoo Themis Mini, Decent Scale or similar) and capture volume and flow rate from the weight curve.

02 — Estimated

Jug Volume

Available now

No scale? Use a measuring jug. Log volume and duration manually — FlowZB derives average flow for you. Good enough for most diary entries.

03 — Manual

Catheter

Available now

For users self-catheterising — log volume drained and time without the flow-rate workflow. Same diary, different input.

What it does

Everything you need. Nothing you don't.

A handful focused capabilities, built around how people actually manage voiding conditions. Designed to disappear into your routine, not become it.

01

Measured Void Sessions

Connect a BLE scale to capture volume, peak flow rate, and voiding duration. Results are presented clearly — no clinical jargon required.

Session analysis screen
02

Personal Diary

Log drinks, symptoms, manual voids, and nocturnal events alongside your measured sessions. Builds a picture of your bladder life over time — the context behind the numbers.

FlowZB diary view
03

Trends Over Time

Charts that show how your peak flow, voided volume, and frequency change week by week and month by month. Spot gradual changes a single clinic visit would never reveal.

FlowZB trends view
04

Private by Design

All data is stored on your device using SwiftData. No account required. No server. Nothing transmitted. Your voiding history is yours — completely and permanently.

05

Nocturia Tracking

Log night voids, track nocturnal volume, and build a personal baseline over 30 logged nights. The morning check-in captures what happened overnight — the part of BPH that disrupts sleep most.

FlowZB nocturia charts
06

Knowledge Map

A built-in reference that connects what FlowZB measures to what the clinical literature says — peak flow, voided volume, and more. It classifies evidence by type and strength. It does not diagnose. It helps you understand.

FlowZB knowledge map
Free vs Pro

Your data is always yours.

Capture and your raw data are always free up to 30 sessions. Data trends and other features are Pro — a one-time purchase permanently unlocks everything described below.

Free £0

Always. No credit card, no trial period.

  • All capture methods — BLE scale, jug volume, catheter, manual void
  • Session history — up to 30 sessions
  • Complete diary — drinks, food, symptoms and sessions in one place
  • Trend charts — core trend charts
  • Knowledge map — definitions and help
  • Raw data export — CSV format
Pro Once

One-time purchase. Permanently unlocks everything below:

  • Everything in Free, plus:
  • Unlimited session history
  • Trend insights — what your data is telling you
  • Personal quantile bands — your baseline, not a population average
  • Nocturia, Frequency and Flow Maps — A full picture of your voidings
  • Home metric picker — what you track front and centre
Pro includes the features listed. New capabilities may be offered separately in the future.
How to use FlowZB

Guides & walkthroughs.

Short walkthroughs covering the key parts of the app.

Connecting a BLE scale

Connecting a BLE scale

~40 secHardware setup
Connecting a BLE scale

Using the Diary tab

~40 secDaily logging
Connecting a BLE scale

Reading your trends

~50 secUnderstanding your data
More videos coming soon. In the meantime ask a question.
Your data

Private by design, not by policy.

Most health apps collect your data and ask for your trust. FlowZB is built so that trust is never required — there's nothing to leak, nothing to monetise.

Stays on your device

All session data, diary entries, and profile information is stored locally using SwiftData. It never leaves your iPhone or your personal iCloud backup. Only you have access to it.

No server, no cloud

There is no FlowZB backend. There is no database with your information. There is nowhere for your data to go.

No account required

You don't sign up, log in, or hand over an email address. The app works entirely without identifying you.

No advertising, no tracking

FlowZB contains no analytics, no crash reporting that leaves your device, and no third-party SDKs that observe your behaviour.

Read the full Privacy Policy →

Help

Common questions.

The most-asked questions, all in one place. If yours isn't here, the contact card on the right reaches the person who built the app.

What do I need to use FlowZB?
An iPhone running iOS 17 or later. For measured sessions you'll also need a compatible BLE weight scale (or our bespoke flow sensor when it becomes available). Manual and jug modes require no hardware at all.
Is FlowZB a medical device?
No. FlowZB is a personal wellness app, not a regulated medical device. It is not intended to diagnose, treat, or monitor any medical condition. Think of it as a detailed personal diary you can bring to clinical appointments — not a replacement for clinical care.
Which BLE scales are compatible?
FlowZB currently recognises the Bookoo Themis Mini and the Decent Scale. Support for additional hardware is ongoing.
Can I export my data?
Yes. FlowZB can export your session history as CSV — voided volume, flow metrics, timestamps, and capture method, which you can use for your own analysis. A PDF summary export is also on the roadmap.
How do I delete my data?
All data lives on your device and is backed up to iCloud so your data is safe if you change phones. Individual sessions and diary entries can be deleted from within the app at any time. Also, there is a dedicated function in the app to safely delete all your data from your device and iCloud.
Get in touch

A direct line to the developer.

Questions, feedback, or just want to know more about the project? Drop a note below — replies usually come within a couple of days.

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