Colitis Tracker helps people living with Crohn's disease, ulcerative colitis, IBS, and other digestive conditions log daily symptoms, monitor medication adherence, and share meaningful reports with their care team — without giving up their privacy.
What it does
Designed by a nurse living with Crohn's disease — every feature exists because it was actually needed, not because it looked good on a feature list. Whether you have Crohn's, ulcerative colitis, or IBS, the data you need is the same: what happened, when, and how often.
Privacy First
Health data is deeply personal. We built Colitis Tracker so that we are never in possession of it — not because we have to be, but because it's the right thing to do.
Every exported report includes a full methodology note explaining exactly how each insight was calculated — so you and your doctor are always looking at the same information.
We collect nothing on our servers. When you sign in with Google or Microsoft, a short-lived OAuth token is stored locally in your browser to keep you signed in. That token never leaves your device to our servers.
All symptom logs, medication records, weight entries, and notes are stored in your own Google Drive or OneDrive — depending on which account you used to sign in. Colitis Tracker reads and writes directly to your storage. We never receive, process, or retain this information.
When you sign in with Google, you authorize Google Drive access directly using your own Google account. When you sign in with Microsoft, you authorize OneDrive access directly using your own Microsoft account. We receive an access token that allows the app to read and write your data file — nothing else.
To delete all of your Colitis Tracker data, delete the file named colitis-tracker-data.json from your Google Drive or OneDrive. You control it directly — no need to contact us.
Questions about your privacy? Email us at bit3computing@gmail.com and we'll respond within 48 hours.
Our Story
Colitis Tracker started in 2014 as a simple iOS app. A registered nurse diagnosed with Crohn's disease needed a way to track her symptoms between appointments. As an RN, she understood better than most what her gastroenterologist actually needed to see. She wasn't looking for a wellness app. She needed a clinical log she could hand to her doctor. That need — a straightforward, private record of what your gut is doing — turns out to be just as relevant for IBS as it is for IBD.
The original app did the job, but over the years the limitations became clear. Features she needed didn't exist. It was iOS only. There was no way to share a report with her care team.
So we rebuilt it from scratch — as a web app, available on any device, with privacy at the center of every decision. Your data doesn't live on our servers because it doesn't need to. It lives where you put it.
Colitis Tracker is built for anyone living with Crohn's disease, ulcerative colitis, IBS, or any other digestive condition — and for their families who want to help them stay on top of it. We hope it helps.
— Built with love, for someone who needed it.
Common Questions
Questions about setup, privacy, or how the app works? You're in the right place.
No download required. Colitis Tracker is a web app — just open app.colitistracker.com in your browser and sign in. You can use it entirely from your browser, or add it to your home screen for a full app-like experience (see below).
Open the app in Safari, then tap the Share button (the box with an arrow at the bottom of the screen). Scroll down and tap "Add to Home Screen," then tap "Add" in the top right. The Colitis Tracker icon will appear on your home screen and the app will open in full-screen mode — no browser chrome, no URL bar.
Open the app in Chrome, tap the three-dot menu in the top right, then tap "Add to Home screen" or "Install app." Tap "Add" to confirm. The app will appear on your home screen and launch like any native app.
Yes. The app works in any modern browser — Chrome, Safari, Firefox, Edge — on iPhone, Android, Mac, and Windows. Your data syncs automatically across all of them since it's stored in your cloud account, not on your device.
Each daily entry lets you log nine symptoms (including rectal bleeding, abdominal pain, urgency, fatigue, and tenesmus), each of your medications individually, food triggers, and bowel movements — each one logged individually with the time it occurred and its Bristol Stool Scale type. You can also log your body weight and free-text notes. The calendar gives you an instant color-coded visual overview of any month.
Yes — just tap any past date on the calendar to open and edit that day's entry. There's no restriction on backdating entries.
Go to the Meds tab and tap "+ Add a Medication." Enter the name and optional dose (e.g. "Mesalamine, 800mg"). Once added, each medication appears as its own individual toggle every time you log a day — so you can track whether you took each one, not just "some pills."
Food triggers are foods commonly associated with IBD and IBS flares — dairy, gluten, caffeine, spicy food, alcohol, and more. The app includes a curated default list sourced from clinical guidelines. You can enable or disable any trigger in Settings, and add your own custom ones. The Trends tab shows which triggers appeared most often in any given month.
The Bristol Stool Scale is a clinically validated tool that classifies stool into 7 types — from Type 1 (hard, separate lumps — severe constipation) to Type 7 (entirely liquid — severe diarrhea). Types 3 and 4 are considered normal. It's widely used by gastroenterologists to track IBD and IBS patterns over time. Colitis Tracker lets you log your Bristol type each day alongside your BM count, so your doctor gets both the frequency and the character of your symptoms in one report.
Go to the Reports tab, choose a date range (last 30 days, 90 days, or custom), and tap "Generate PDF Report." A clean summary — symptom frequency, medication adherence, weight, and a full daily log — opens in-app. From there you can tap "Print" to save it as a PDF or share it directly from your phone.
Your data is stored in your own cloud storage — not ours. If you sign in with Google, it goes to a private app folder in your Google Drive. If you sign in with Microsoft, it goes to your OneDrive. It's a single JSON file called colitis-tracker-data.json. You own it completely.
No. Your data is written directly to your Google Drive or OneDrive from your device. It never passes through our servers. We don't have a database of user health records — we have no way to see what you've logged, and we've built it that way on purpose.
When you sign in with Google, the app requests access only to its own private app folder in your Drive — it cannot see or touch any of your other Drive files. When you sign in with Microsoft, it requests access to its own app folder in OneDrive only. Neither provider shares your account contents with us.
Delete the file named colitis-tracker-data.json from your Google Drive (look in the "App Data" folder) or OneDrive (look in the app's folder). That's the only file we ever create. You don't need to contact us — you control it directly.
The app loads and functions in your browser, but saving and syncing entries requires an internet connection to reach Google Drive or OneDrive. If you're offline when you tap Save, the entry won't sync until you're back online — so we'd recommend logging when you have a connection.
No download required. Open it in your browser, add it to your home screen, and start logging today. Free, forever. Built for Crohn's, colitis, IBS, and anyone who needs a better way to track their gut health.
Works on iPhone, Android, and desktop. No app store needed.
Colitis Tracker is free and always will be. I'm an independent developer building and maintaining it on my own time. If it's helped you or someone you love, buying me a coffee is a great way to say thanks — and helps keep the lights on.
☕ Buy Us a Coffee