Comparison

Belly Flow vs Ondelle

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Belly Flow

Features
Read full description

Belly Flow helps you keep track of your digestive health in daily life through simple logging and clear visualization. Follow your daily experiences, identify patterns, and gain insights into your well-being. Key Features: • Quick and easy logging of symptoms and bowel movements • Medication and dosage tracking • Water intake and other symptom monitoring • Visual overview with charts and trends • Comprehensive data export to share with healthcare providers • Available in Swedish and English! Perfect for: • Keeping track of your digestive health in daily life • Discovering connections between habits and how you feel • Logging medication and seeing how it affects your symptoms • Tracking water intake and other factors that impact your health • Exporting data to share with your doctor or dietitian New app – your feedback is valuable! Belly Flow is brand new, and we want to make it even better. Missing a feature or have suggestions? Get in touch! Your feedback helps us develop the app for everyone who wants to understand their digestive patterns.

About

Ondelle

Track your menstrual cycle, log symptoms, and view predictions privately. Offers detailed insights, pregnancy tracking, and birth control reminders with optional premium features.

Highlights
  • Period and symptom logging
  • Calendar view with fertile days
  • Cycle pattern insights
  • Pregnancy week tracking
  • Birth control reminders
  • Private data export and erasure
Features
Read full description

Meet Ondelle, a private period calendar designed to help you keep your history close. START FREE • Log when a period starts and ends, and record symptoms • See your logged dates and estimated fertile days on a clear calendar after two period starts • Take an optional illustrated tour and choose a profile illustration • Use privacy controls, app lock, manual full-data export and restore, and data erasure without a purchase EXPLORE ONDELLE PREMIUM • Read a Cycle Brief with dated observations from your own entries • Record mood, flow, temperature, cervical mucus, and ovulation-test results • Review cycle patterns and Insights • Follow pregnancy weeks with general guidance, check-ins, reminders, and a private journal • Create a personal report for appointments • Save protected recovery snapshots on this device with Memory Vault • Record a birth-control method and personal dates; set a one-time reminder for the next change, injection, check, or replacement date you enter Choose a monthly or annual subscription, or a lifetime purchase. Prices and any eligible introductory offer appear in the App Store purchase sheet. Restore Purchases is available in the app. Existing Ondelle 1.0 profiles keep access to the features previously available to them. Your health entries stay on your device unless you choose to export them. No email, phone number, or cloud account is required. Apple and RevenueCat process purchase information to verify Premium access. Ondelle is a wellness and education tool. Predictions are estimates and do not confirm ovulation; they are not contraception, medical advice, or diagnosis. Consult a qualified healthcare professional for medical questions. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Belly Flow4 screens
Ondelle4 screens

Verdict

The call

The clearest difference is in-app purchases: Belly Flow at none against Ondelle's 3. Ondelle's advantage is update cadence (daily vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Ondelle sells 3 in-app purchases, starting at $3.99 per month. Belly Flow asks for nothing beyond the download.

UpkeepUpdate frequency

Belly Flow ships an update every 3 weeks, Ondelle daily. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

Scorecard2 real differences · 8 level
Belly Flow versus Ondelle: the parameters behind the verdict, then further details
ParameterBelly FlowOndelle
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 weeksDaily — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size23 MB16 MB
Age rating12+17+
DeveloperGabriella Brobergskj enterprises llc

In-app purchases

None

Belly Flow

No in-app purchases

3 purchases

Ondelle

Subscriptions2
  • Ondelle Premium Monthly$3.991 Month
  • Ondelle Premium Annual14 Days trial$29.991 Year
One-time1
  • Ondelle Premium Lifetime$79.99

Questions

Is Belly Flow free?
Belly Flow is free to download, with no in-app purchases.
Is Ondelle free?
Ondelle is free to download, with in-app purchases available.
Do Belly Flow or Ondelle have ads?
Neither Belly Flow nor Ondelle shows ads.
Which is updated more often, Belly Flow or Ondelle?
Belly Flow ships an update every 3 weeks, and Ondelle daily. Most recently, Belly Flow was updated on October 25, 2026 and Ondelle on October 9, 2026.

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