StudySync vs TummyTrail

This is the mobile app for StudySync. Participants must be onboarded from beforehand. StudySync is developed by the Snyder lab at Stanford University.

Free CSV export, always — your data, your file, no subscription required. Plus a doctor-ready PDF report for your next GI appointment. TummyTrail is a private food symptom diary and gut tracker. Log meals, symptoms, and bowel movements in seconds, then watch your trigger patterns emerge — without handing your health data to anyone. YOUR DATA NEVER LEAVES YOUR PHONE - No account. No sign-up. Open the app and start logging. - Everything is stored on your device — we don't even have a server that could see it. - No ads, no trackers, no selling your data. Ever. TRACK WHAT MATTERS, FAST - Meals, drinks, and snacks — favorites make logging one tap - Symptoms with severity — bloating, pain, cramps, nausea, reflux, and your own custom symptoms - Bowel movements with an illustrated Bristol stool chart picker - Meds, stress, sleep, water, exercise — plus a sick-day flag that keeps illness out of your analysis - Gentle reminders scheduled on your device, never pushed from a server SEE YOUR PATTERNS (TUMMYTRAIL INSIGHTS) - Trigger analysis across adjustable time windows — which foods most often preceded your symptoms - Doctor Report PDF: symptom frequency, Bristol distribution, suspect foods, and your med log — real data for your appointment instead of "I think maybe dairy?" - Full history, trends, and charts FREE TO USE, FAIR TO UPGRADE The core diary is free forever — unlimited logging, your last 30 days of charts, streaks, and the all-time CSV export. TummyTrail Insights is an optional subscription; because there are no ads, free users are never nagged mid-log. BUILT FOR REAL GUTS Whether you're managing IBS, IBD, reflux, food sensitivities, an elimination or low-FODMAP diet, or just mystery stomach aches — TummyTrail keeps up without getting in the way. Logging takes seconds, not minutes. PRIVATE BY ARCHITECTURE, NOT BY PROMISE Most health apps promise privacy in a policy. TummyTrail delivers it in the design: local-first storage means your symptom history physically cannot be breached, sold, or subpoenaed from us — we never have it. Delete the app (or use Settings → Delete All Data) and it's gone. TummyTrail is a personal wellness journal — a food symptom diary and pattern tracker. It is not a medical device and does not provide medical advice or diagnosis. Always consult a healthcare professional about your symptoms. Terms of Use: https://tummytrail.com/terms Privacy Policy: https://tummytrail.com/privacy