The real difference: who does the pattern-finding
Bowelle is a diary that you read; Clairop is a diary that reads itself. That is the whole decision for most people. Bowelle makes logging fast and keeps it private, then gives you charts and graphs to study. Clairop does the comparison for you and tells you, with numbers, which foods line up with worse symptoms and how long after eating.
Neither approach is wrong. Some people like seeing their own data and drawing their own conclusions, and Bowelle respects that with a clean, uncluttered screen. The difficulty is that gut reactions are often delayed. A common theme in r/ibs is people discovering, after weeks of logging, that they had been blaming the wrong meal because the reaction landed the next morning. Spotting a 14-hour lag by eye on a chart is hard. Testing it statistically is what Clairop was built to do.
Where Bowelle is the better choice
Bowelle wins clearly on three things, and they are worth taking seriously.
It runs on Android. Clairop is iPhone only. If you have an Android phone, the choice is made for you.
It has a free tier and needs no account. You can download Bowelle and start logging without signing up for anything. Clairop is free to download and set up, but using it needs a Clairop Pro subscription.
It keeps your data on your phone. Bowelle's privacy policy says it does not store your entries on its own servers. Clairop syncs to an account, which is what lets the analysis and the doctor report work, and you can export or delete everything at any time, with or without a subscription.
Bowelle is also actively maintained, with a new version in October 2026 and a 4.7 rating from more than 2,000 App Store ratings, and an independent dietitian review by Healthify found no safety concerns.
Clairop logs meals, symptoms and stool in seconds, then looks for the foods your gut reacts to, including reactions that land days later.
Where Clairop goes further
Delayed trigger analysis. Clairop compares symptom severity after meals that contained a food against meals that did not, in three windows: under six hours, six to twenty-four hours, and one to three days. It shows how big the difference is, not just whether there is one, and it waits until there are at least five meals with the food and five without before it says anything. You can read how the method works on the method page.
Protection against false triggers. Test 200 foods across three windows and roughly 30 will look like triggers by chance alone. Clairop corrects for this (false discovery correction), so a food is not flagged as something to avoid just because of noise. A chart-based diary cannot do this, which is a big reason why people who log for months still feel unsure what their triggers are.
FODMAP data with sources. Scan a barcode and Clairop breaks the product's FODMAP load down across all six subgroups, citing the published paper each value comes from. If an ingredient is not in its reference table, it says there is no data rather than assuming the food is low. Bowelle does not include FODMAP information.
Crohn's and colitis scores. For Crohn's disease, Clairop calculates the Harvey-Bradshaw Index; for ulcerative colitis, the PRO-2 score, both from answers you have already logged. Bowelle has no disease activity scores, which matters if you have IBD rather than IBS.
The Bristol scale. Clairop logs stool form on the 7-type Bristol scale, the scale used to define the IBS subtypes (Lewis 1997). A 2024 review found Bowelle using a 1 to 5 rating instead.
Logging and doctor reports
Both apps take logging speed seriously, because the most common reason a food diary fails is that it is abandoned within a week. Bowelle offers single-screen entry, photos and saved lists of the foods you eat most. Clairop offers one-tap stool entries, symptom sliders, voice, and a meal photo that lists the ingredients for you.
Both produce something to take to an appointment. Bowelle exports a PDF and a CSV. Clairop produces a one-page GI visit report with your score trend, bowel pattern against your own baseline, days with blood, night-time episodes, medication adherence and any triggers that held up, with a clear note that it is patient-entered data. For more on what makes a report useful, see how to prepare for a GI appointment.
The honest bottom line
If you want a free, private, simple diary, or you use Android, choose Bowelle. If you have been logging for a while and still cannot tell what sets your gut off, especially when reactions seem to come out of nowhere, Clairop's delayed-trigger analysis is the part Bowelle does not have. Either way, a tracker finds associations, not proof: confirming a trigger still means removing a food and reintroducing it in a planned way, ideally with a dietitian. If you have red-flag symptoms such as blood in your stool, unexplained weight loss or symptoms that wake you at night, see a doctor promptly rather than relying on any app.