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You test one suspect food per week. For two days you eat as usual, for three you skip it, and for two you bring it back, checking in each evening. At the end of the week you get a result for that food: trigger, likely trigger, unclear, or safe for you.

Scans check the ingredients against FODMAP data and your own triggers. The results are estimates, so use them as a guide alongside your healthcare provider’s advice.

Meal and menu scans, voice logging and the other AI features need an internet connection.

Yes, we take your privacy seriously. All data is encrypted and stored securely. We never sell your personal health information, and only share it with the service providers that help us run the app. See our Privacy Policy for details.

Fern keeps short notes so her messages fit your situation. You can see everything she remembers in the app’s settings, forget any of it, or turn personalisation off.

Subscriptions are managed by the App Store or Google Play, so cancel in your store account settings. To avoid being charged after a free trial, cancel at least 24 hours before it ends.

In the app, go to Settings, then Account, then Delete account. This permanently removes your account, logs, results and plan straight away. It does not cancel your subscription, so cancel that in your app store settings first. If you can’t get into the app, email hello@fourintegers.com and we’ll delete it for you.

No, Gut Lens is a tool to support your IBS management, not replace medical care. Always consult with a qualified healthcare provider for diagnosis and treatment decisions. The in-app report makes it easy to share what you found with them.

We love hearing from our users! Email us your feature ideas at hello@fourintegers.com with “Feature Request” in the subject line.