Comparison

Belly Flow vs Reintro

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
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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

Reintro

Features
Read full description

Reintroduction is where most low-FODMAP plans stall. Reintro schedules your challenges, captures symptoms in seconds, and builds a tolerance map you can hand to your dietitian. Built with Phase 2 dietitian guidance — calm, clinical, and explainable. No streaks, no shame, no diet hype. — FEATURES — • Finish reintroduction in 6–8 weeks with a guided 9-group schedule: lactose, fructose, sorbitol, mannitol, GOS, and the four fructan groups (wheat, onion, garlic, fruit). • Track real food triggers, not noise — built-in confounder logging for sleep, stress, and cycle so a bad night doesn't poison your results. • Log a dose or symptom in 10 seconds with severity sliders and a Bristol stool picker. • Watch your tolerance map form in real time: pass, fail, inconclusive — with the exact dose days and confounder flags behind every verdict. • Recover gracefully if you miss a dose: one tap inserts an extra washout and shifts the schedule forward. • Share a clinician PDF with your dietitian or doctor — date range, outcomes, symptom trends, confounder summary. • Optional Apple Health integration for sleep and cycle data (read-only). • Calm, capped notifications: morning dose, post-dose check-in, evening wrap-up. Quiet hours honored. — HOW IT WORKS — 1. Pick your pace and choose the symptoms you want to track. 2. Follow your daily Challenge Card: today's dose, washout, or rest. 3. Watch your tolerance map fill in. Export a PDF when you meet your dietitian. Reintro is for the person already doing the work who just wants the protocol to make sense. It is not a generic food diary, not a calorie counter, and not a barcode scanner. It is the tool that gets you through Phase 2 with a result you can act on. Start your reintroduction with clarity. Free 7-day trial. Payment will be charged to your Apple ID at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 Payment will be charged to your Apple ID at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions in your Account Settings on the App Store after purchase. Any unused portion of a free trial is forfeited when purchasing a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://BigBalli.com/privacy

Screenshots

Belly Flow4 screens
Reintro3 screens

Verdict

The call

The clearest difference is in-app purchases: Belly Flow at none against Reintro's 3. Belly Flow also leads on iOS requirement (15.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Reintro sells 3 in-app purchases, starting at $9.99 per month. Belly Flow asks for nothing beyond the download.

UpkeepUpdate frequency

Belly Flow ships an update every 3 weeks, Reintro monthly. Both last shipped on September 8, 2026.

Scorecard2 real differences Ā· 4 level
Belly Flow versus Reintro: the parameters behind the verdict, then further details
ParameterBelly FlowReintro
PriceFreeFree
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better18.0
Further details — not scored
Size23 MB173 MB
Age rating12+4+
DeveloperGabriella BrobergBigBalli Consulting llc

In-app purchases

None

Belly Flow

No in-app purchases

3 purchases

Reintro

Subscriptions2
  • Monthly$9.991 Month
  • Yearly7 Days trial$39.991 Year
One-time1
  • Lifetime$59.99

Questions

Is Belly Flow free?
Belly Flow is free to download, with no in-app purchases.
Is Reintro free?
Reintro is free to download, with in-app purchases available.
Do Belly Flow or Reintro have ads?
Neither Belly Flow nor Reintro shows ads.
Which is updated more often, Belly Flow or Reintro?
Belly Flow ships an update every 3 weeks, and Reintro monthly. Most recently, Belly Flow was updated on September 8, 2026 and Reintro on September 8, 2026.

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