Both Bladder Journal and iUFlow are free bladder diary apps. Bladder Journal's free tier adds a full Apple Watch app (iUFlow has none), Apple Health (HealthKit) sync, 10 chart types, Home Screen and Lock Screen widgets, CSV as well as PDF export, and medical history logging — no ads. Optional PRO ($5.99/month) adds Deep Insights and on-device Audio Analysis; Yearly PRO adds Smart Alerts and AI Chat. iUFlow is a solid free option with basic tracking on both iOS and Android, including bowel logging with Bristol chart — best for users who need cross-platform support or the simplest possible diary. Both offer free PDF export for your doctor. For iPhone users, Bladder Journal is the clear winner with far more free features.
At a Glance
Bladder Journal
by JheroCode — iOS (iPhone + Apple Watch)
- + AI Deep Insights + AI Chat
- + Smart Alerts (AI-predicted bathroom timing)
- + Audio Analysis (on-device privacy)
- + Full Apple Watch companion
- + 4-level urgency + stream strength
- + HealthKit integration
- + Free core + PRO from $5.99/mo
- − iOS only
- − No bowel tracking
iUFlow
by Kesem Solutions — iOS + Android
- + Completely free (unlimited)
- + Cross-platform (iOS + Android)
- + Bowel tracking (Bristol chart)
- + Longest-running of the apps we compared (since 2015)
- + PDF export included
- − iPhone app last updated November 2024
- − No Apple Watch app
- − Volume entered by hand, or with its optional uroflowmeter
- − Listing is English only
Feature-by-Feature Comparison
| Feature | Bladder Journal | iUFlow |
|---|---|---|
| Urination Tracking | Urgency, stream, pain, duration, volume | Time, volume, first-morning void and nocturia figures |
| Fluid Intake | Type + amount (ml/oz) | Yes |
| Leakage Tracking | Severity + pad changes + notes | Yes |
| Urgency Scale | 4-level (None to Severe) | Yes |
| Stream Strength | Strong / Intermittent / Weak | — |
| Audio Volume Estimation | Yes (100% on-device) | — |
| AI Insights | Deep Insights + AI Chat | — |
| Apple Watch | Full companion app | No |
| Charts | 10 types + Bubble Heatmap | — |
| HealthKit Sync | Yes | — |
| Bowel Tracking | No | Yes (Bristol chart) |
| PDF/CSV Export | Both (free) | |
| Price | Free core / PRO from $5.99/mo | Free, no in-app purchases |
| Platform | iOS only | iOS + Android |
| Data Privacy | On-device, encrypted iCloud optional | Collects health data, not linked to you (App Store label) |
| Smart Alerts | Yes (AI predictions) | — |
| Urine Color | 7-level chart | Yes (color picker) |
| Widgets | Home + Lock Screen | — |
Which App Should You Choose?
Choose Bladder Journal if you:
- ✓ Have an iPhone (especially with Apple Watch)
- ✓ Want AI-powered pattern analysis and insights
- ✓ Need detailed urgency and stream strength tracking for OAB
- ✓ Want hands-free volume estimation via Audio Analysis
- ✓ Prioritize on-device privacy for health data
- ✓ Are doing bladder training and need interval tracking
Choose iUFlow if you:
- ✓ Need cross-platform support (Android + iOS)
- ✓ Want completely free tracking with no paywalls
- ✓ Need bowel tracking alongside bladder tracking
- ✓ Prefer a simple, no-frills voiding diary
- ✓ Don't need AI analysis or Apple Watch support
Frequently Asked Questions
Is Bladder Journal or iUFlow better for tracking overactive bladder?
For OAB specifically, Bladder Journal is the stronger choice. It tracks 4-level urgency (None to Severe), has a dedicated Time Gap chart for monitoring bladder training intervals, offers AI Deep Insights to identify triggers, and includes Apple Watch support for discreet urgency logging. iUFlow covers basic frequency and volume tracking but lacks urgency-specific tools and AI analysis.
Is iUFlow really completely free?
Yes, iUFlow is completely free on both iOS and Android with no ads. However, Bladder Journal is also free for core tracking — and offers significantly more features for free: full Apple Watch app, Apple Health (HealthKit) sync, 10 chart types, Home Screen & Lock Screen widgets, medical history logging, health education program, and free PDF/CSV export. Bladder Journal's optional PRO features (Audio Analysis, Deep Insights) start at $5.99/month — Yearly PRO adds Smart Alerts and AI Chat —, but the free tier alone surpasses iUFlow in feature breadth.
Which app has better data exports for doctors?
Both apps offer free PDF export. Bladder Journal additionally offers CSV export and generates reports with charts, urgency patterns, and correlation data. iUFlow's PDF report covers intake and output, and it can mark first-morning voids for nocturia figures. If your urologist prefers reports with charts, Bladder Journal has the edge.
Can I use iUFlow on Apple Watch?
No, iUFlow does not have an Apple Watch app. Bladder Journal has a full Apple Watch app — you can log urination, fluid intake, and leakage from your wrist, plus start/stop the urination timer.
Which app is better for nighttime tracking (nocturia)?
Bladder Journal is better for nocturia because it has a nighttime toggle for tagging overnight trips, Apple Watch logging so you don't need to fumble with your phone at night, sleep data integration via Apple Health, and AI Deep Insights that correlate evening fluid intake with nighttime frequency. iUFlow tracks nighttime voids but without these dedicated features.
Related Comparisons
Try Bladder Journal Free
All core tracking is free — urination, fluids, leakage, charts, Apple Watch, and PDF export. No account required.
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