Schedule your FODMAP challenges, track symptoms in seconds, and build a personal tolerance map you can share with your clinician.



No guesswork, no spreadsheets. Just structured challenges and clear answers about your food triggers.
Stop second-guessing what to test next — your full 6-to-8 week plan is built the moment you open the app.
Log symptoms, bowel movements, sleep, stress, and other confounders in seconds with intuitive sliders.
See which FODMAPs you tolerate at a glance. A clear visual grid of your results across all 9 groups.
Generate a professional report to share with your dietitian, complete with dose-by-dose evidence and outcomes.
Never wonder if a result was a fluke — see the exact day, dose, and symptoms that produced every verdict.
Optional daily notifications with quiet hours so you never miss a log, without the noise.
Sleep, steps, heart rate — Reintro pulls confounder data from Apple Health automatically so a bad night doesn't poison your results.
Tolerance shifts. Reintro reminds you to retest the FODMAPs you failed three months later — find new wins as your gut heals.
Reintro handles the complexity so you can focus on how you feel.
Tell us where you are in Phase 2 and pick your pace. We'll build your full challenge schedule.
Each day shows exactly what to eat and how much, with plain-language dose instructions, alternative foods, and per-challenge rationale.
Quick sliders for symptoms, bowel movements, sleep, and stress. No typing needed.
Your tolerance map fills in automatically. Export a PDF for your clinician when you're done.
After weeks of structured testing, your tolerance map shows exactly which FODMAP groups you can eat freely and which to limit.
Schedule your challenges, log symptoms in seconds, and build the tolerance map you can share with your clinician.