Short answer: The best low FODMAP app depends on the job. For checking whether a specific food and serving is low FODMAP, the Monash University app is the research-based reference. For logging meals, a general food tracker helps. For a structured weekly plan, Nutrition.io's free assessment and optional report are one option. Reintroduction is best guided by a dietitian.
Free tool: AIP, low-FODMAP and Hashimoto's food checker — check any food against AIP, low-FODMAP and Hashimoto's side by side.
Medical disclaimer: A low FODMAP diet is a short-term elimination and reintroduction process, not a lifelong diet, and it does not diagnose IBS. See a doctor promptly for rectal bleeding, unexplained weight loss, fever, night-time symptoms, anaemia, or new bowel changes after age 50 — these need investigation before any diet change.
| Your actual need | Option to consider | What to check before choosing |
|---|---|---|
| Check if a food and serving size is low FODMAP | Monash University FODMAP Diet app | One-time purchase price, serving-size traffic lights, regional food coverage |
| Log what you eat and when symptoms happen | A general food and symptom logger | Custom symptom fields, export, whether FODMAP data is verified or crowdsourced |
| Get a structured week of meals that fits your preferences | Nutrition.io web assessment and optional report | Free score first; $9.99 USD one-time report; avoidance preferences are not an allergen guarantee |
| Plan reintroduction challenges | A registered dietitian trained in FODMAP | Professional guidance matters most in this phase |
| Find out why symptoms happen | Your doctor | Red-flag symptoms and coeliac testing come before any elimination |
Start the free nutrition assessment if you want a planning starting point. We make Nutrition.io, so this is a disclosed buying guide, not an independent award.
The low FODMAP approach has three phases: restriction for roughly two to six weeks, structured reintroduction, and a personalised long-term diet. A 2022 systematic review and network meta-analysis found the low FODMAP diet ranked first among dietary interventions for global IBS symptoms, while noting the evidence quality was low and that many trials were short (Black et al., 2022). An earlier controlled trial showed symptom reduction versus a typical Australian diet over three weeks (Halmos et al., 2014).
That evidence supports a careful, temporary process, which means a useful app has to help you move through the phases, not keep you restricted indefinitely. The full food lists are in our low FODMAP diet food list, and a ready-made week is in the low FODMAP meal plan.
FODMAP content depends on serving size: a small portion of a food can be low while a larger one is high. Monash University laboratory-tests foods and publishes serving-based ratings in its official app. Crowdsourced tags in general trackers can be useful for logging, but verify serving sizes against a tested source.
Nutrition.io does not maintain a FODMAP laboratory database, and its report is not a substitute for serving-level ratings. If your main question is "can I eat this, and how much?", buy the tested reference.
Long-term strict restriction can reduce dietary variety and may affect gut bacteria; guidelines position restriction as temporary. The British Dietetic Association guidance supports dietitian-led delivery of the full three-phase process (McKenzie et al., 2016). Look for reintroduction tracking, not only a "forbidden foods" list.
A food database answers single-food questions; it does not hand you dinner on Wednesday. Nutrition.io's questionnaire collects dietary pattern, eating style, cooking time and foods you avoid, then the optional report builds a seven-day menu, shopping list and 30-day actions. Check ingredients yourself: the menu is not certified low FODMAP for every serving.
Compare a one-time app purchase, a subscription, and a one-time report separately. Nutrition.io's score is free; the report is $9.99 USD once, with tax and the final total shown before checkout. The mobile app is separate and not bundled with the web report.
If you want daily check-ins, Nutrition.io lets you copy your complete purchased plan into an AI assistant you choose. Read the AI meal tracker guide before sharing health information with any third-party service.
If your symptoms point toward bacterial overgrowth, see the SIBO diet app comparison. If you are unsure whether you have IBS at all, start with your doctor and the IBS diet guide. For the bigger picture, the gut health hub connects every gut guide on the site.
Some general trackers offer free FODMAP tags, but laboratory-tested serving ratings usually come from a paid reference app. Nutrition.io's assessment score is free; only the optional report costs money.
Most clinical guidance describes roughly two to six weeks of restriction before structured reintroduction. A dietitian can tailor timing to your symptoms.
No. IBS diagnosis requires a clinician to rule out other conditions such as coeliac disease and inflammatory bowel disease.
Sources: Black et al., Gut (2022); Halmos et al., Gastroenterology (2014); McKenzie et al., Journal of Human Nutrition and Dietetics (2016). Product details were checked against the official page linked above. The Nutrition.io Editorial Team compiled this guide from the cited sources; it has not received an individual clinical review.
Free printable: Food Safety & Timing Guide (PDF) — thyroid and gut food evidence, the levothyroxine and supplement timing chart, a shopping checklist and a one-week symptom log.