Updated October 2026 by Kamal Nasir
IBS apps fall into two groups: diaries that record food, symptoms and bowel movements, and FODMAP guides that tell you what a food contains. This page compares three of them with Fennel, a diary that reports how often your symptoms followed each food and FODMAP group. Each summary is drawn from the app's own App Store description.
A food and symptom diary that records how you feel, what you eat, water, stress, bowel movements, notes and custom fields. Charts let you overlap data types, daily averages cover a period you choose, and you can filter your history and export it by email for a doctor, nutritionist or dietitian. It reads sleep, steps, water and weight from Apple Health. App Store
Logs food, drink, medication, stress, exercise and symptoms, with a food database you can search or scan by barcode and bowel movements recorded on the Bristol scale. It runs correlation analysis between foods and symptoms, produces reports, exports PDF or CSV, and lets you share your diary with a clinician through its web app. App Store
From the Monash University research team that developed the low FODMAP diet. It has a food guide rating the FODMAP content of hundreds of foods with a traffic light system, a list of products certified low FODMAP by Monash, recipes, shopping lists, and a diary for food, symptoms, bowel habits and stress that guides the reintroduction step. App Store
A food and symptom diary that compares the days you ate a food with the days you did not and reports how often symptoms followed, by food and by FODMAP group. Every reading shows the days and counts behind it, nothing is reported until there is enough data, and it adds a guided reintroduction program and a report for your appointment. No account, and the diary stays on your phone. About it ยท App Store
Usually what you ate and when, your symptoms and when they came, and your bowel movements, often alongside stress and sleep. Timing matters, because a pattern is about what came before a symptom. Take the record to your doctor or a registered dietitian.
Not quite. A FODMAP guide such as the Monash FODMAP Diet app tells you the FODMAP content of foods, while a tracker records what you ate and how you felt. Some do both: the Monash app includes a diary, and Fennel groups your foods by FODMAP group when it looks for patterns.
Our entry in this category: IBS Tracker Food Diary: Fennel.
Published by Kamal Nasir, the developer of the apps marked Ours. Apps change, so check each one's App Store page for its latest features.