Web app · Health And Fitness
FODMAP Detective
Guided FODMAP reintroduction — one group at a time, with a readable verdict
Run the structured three-day escalating challenge for fructose, lactose, sorbitol, mannitol, GOS and fructans, log bloating, pain, urgency, gas and the Bristol scale in seconds, and get the plain-English tolerance verdict per group. 110 bundled foods, free, no account.
Stored in your browser only. Nothing you do in the web version is sent to our servers. Clear your browser data and it's gone — so export a backup from the in-app menu if you want to keep it.
This app is a community proposal.
Try the full browser version now. We build the iPhone and Android app once 100 people upvote it.
We'll email you once, when it ships. Unsubscribe anytime.
In your browser
What you can do in FODMAP Detective on the web
Six guided challenges
Each FODMAP group gets its own test food, three escalating daily doses and a washout day — honey, milk, blackberries, mushrooms, almonds and wheat bread, with the exact portions and the reason each food was chosen.
Symptom logging that fits IBS
Bloating, pain, urgency and gas on 0–4 taps plus the Bristol stool scale 1–7, time-stamped and automatically tied to the group you are mid-challenge on.
Plain-English verdicts
The same engine as the iPhone app: any entry totalling 5 or more out of 16 counts as a reaction, and the verdict names the severity band and the exact day and portion where the group tripped you up.
The case board
All six groups on one grid — not started, in progress, tolerated, triggered — so you always know what is left and what the washout is for.
110 bundled foods
Every food tagged by FODMAP group, low/moderate/high level and its serving threshold, searchable and filterable by group and level. On-device, no API.
Dietitian report
Verdicts, statuses, peak severity per group and the full symptom log, saved as one file to hand over at your appointment.
Screens
Every screen, rebuilt for the browser
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1
Home
Where you are in the reintroduction, the active challenge, the six-group case board and your latest entries.
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2
Challenges
All six groups with test food and status, plus the tolerated/triggered/to-go tally.
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3
Challenge detail
Why this test food, the three escalating doses and washout as a timeline, entries logged during the window, and Start / advance / Finish & get verdict.
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4
Log symptoms
Four 0–4 intensity rows with a running total out of 16, the Bristol slider, time, group and note.
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5
Symptom log
Worst entry per day across 28 days plus every entry grouped by day.
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6
Verdicts
Tolerated, triggered and remaining counts with the full sentence for each decided group.
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7
Food list
The bundled 110 foods, searchable and filtered by FODMAP group and level, grouped by category with serving thresholds.
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8
Dietitian report
Per-group verdicts, the symptom summary and peak severity per group, savable as a file.
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9
Settings
Progress counts, the reaction threshold, backup, sample data, reset challenges and erase.
Try it with sample data: Loads a case mid-reintroduction: lactose tolerated, fructans triggered on day 2, fructose in progress on day 2, plus fourteen time-stamped symptom entries across the last four weeks. You can start fresh at any time.
Ready? It's free.
No account, no install, no subscription. Everything you do stays in this browser.
Your say
What should FODMAP Detective do? Tell us before we build it.
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Questions
Is the web version of FODMAP Detective free?+
Yes. Every screen is free to use: no subscription, no in-app purchases, no account.
Do I need an account?+
No. Open FODMAP Detective and start using it right away. Sign in with Google only if you want to upvote an app, save it to your list, or leave a comment.
Where is my data stored?+
Only in this browser's local storage. Nothing you enter is sent to our servers, so we can't see it, back it up, or restore it. Clearing site data, a private window, or another device starts empty. Export a backup from the in-app menu to keep it.
Is there a FODMAP Detective app for iPhone or Android?+
Not yet. FODMAP Detective is a community proposal: the browser version is complete, and we build the iPhone and Android app once 100 people upvote it. Upvoters get one email when it ships.