Get your sh*t together.
Irregular days are frustrating and confusing. Rumblings decodes what your body passes and matches it against your daily routine—giving you clear, private answers so you can finally feel regular again.
Seven types. Zero guesswork.
Every bathroom trip leaves a clue. The Bristol Stool Scale turns vague discomfort into concrete facts—rating consistency from hard pellets to liquid. It is how Rumblings decodes what’s happening inside and tracks your journey back to regular.
Smooth, soft, and easy to pass with zero straining. This is the physiological gold standard of healthy digestion—the ideal baseline we're aiming for every day.
Rumblings uses Type 4 as your target reference baseline to determine which foods, hydration levels, and daily habits keep your digestion regular.
From daily confusion to crystal clarity.
Three simple, private steps to connect what goes in with what comes out—so you finally know what keeps you regular.
Snap or tap in seconds
Photograph an entry and AI decodes it—Bristol type, color, and warning signs. Or skip the camera and log with a quick tap. You confirm everything before it's saved, and the photo is wiped clean immediately.
Connect the missing dots
Syncs with Health Connect and Health Sync to import meals, hydration, and macros directly from MyFitnessPal, Cronometer, Samsung Health, and more. Zero double-logging. Rumblings tracks the things other apps miss—supplements, medications, and context.
Answers, not hunches
Your phone analyzes 24–48h transit lags, isolates non-linear fiber sweet spots, and filters out statistical coincidences. Then, run formal N-of-1 self-trials to scientifically prove what works for your unique body.
Real digestive science. Not AI gimmicks.
Other apps snap a photo and stop at an arbitrary "gut score" or demand that you manually re-type every meal. Rumblings connects your actual nutrition data and uses clinical epidemiology methods to discover what truly affects your gut—and prove it.
Zero double-logging via Health Sync
Already tracking food in MyFitnessPal, Cronometer, Lifesum, or Samsung Health? Rumblings automatically ingests meals, hydration, fiber, and micronutrients through Health Connect and Health Sync. It groups items into real eating occasions and weights ingredients by portion energy—no duplicate typing required.
Smart correlation, real biology
Your gut has a 24- to 48-hour transit window; simplistic same-day matching misses reality. Rumblings models physiological transit lags (Lags 0, 1, 2) and solves the U-Curve dilemma: too little fiber causes constipation, while too much causes urgency. Non-linear tail analysis finds your personal sweet spot, while statistical noise filtering eliminates random coincidences.
Turn hunches into causal proof
Correlation is not causation. Rumblings is the only digestive health app that lets you run formal single-subject (N-of-1) clinical trials. Pre-register elimination or supplement interventions (AB or ABAB phases) with automated adherence scoring and a confounder watchdog that alerts you if sleep or medication shifted during your trial.
| Capability / Dimension | Rumblings Private & Science-Based | AI Stool Scanners (PoopCheck, Plop, etc.) |
Legacy Food Diaries (mySymptoms, Bowelle) |
|---|---|---|---|
| Stool Photo Privacy |
Ephemeral Analysis: Sent securely to Cloud AI for analysis, held in memory during review, and wiped immediately. Never saved to your photo gallery, device storage, or stored in cloud accounts.
|
Uploaded & permanently stored in cloud user accounts.
|
No camera support (manual Bristol scale selection only).
|
| Diet & Nutrition Ingestion |
Zero Double-Logging: Passive sync via Health Connect & Health Sync (MyFitnessPal, Cronometer, Samsung Health, etc.).
|
None. Completely blind to what you eat and drink.
|
Manual re-entry of every single ingredient (high user fatigue).
|
| Transit Time Lags |
24–48h Colonic Lags: Evaluates Lag 0, Lag 1, and Lag 2 days to match physiological digestion intervals.
|
None (no food tracking or lag logic).
|
Static or unlagged same-day matching.
|
| Non-Linear Nutrient Curves |
U-Curve Tail Analysis: Finds personal sweet spots where both too little and too much fiber/caffeine cause symptoms.
|
None.
|
Linear ranking only (cancels out and misses U-shaped effects).
|
| Statistical Noise Filtering |
FDR Guardrails: Mathematical false-discovery rate control eliminates random coincidences across dozens of tags.
|
Arbitrary gamified "Daily Gut Scores" without scientific validity.
|
Unadjusted p-values (frequent false positives and confounding).
|
| Causal N-of-1 Trials |
Structured Experiments: Pre-registered AB & ABAB trials with automated adherence scoring and confounder checks.
|
None. Cannot test or validate hypotheses.
|
None (observational correlation only).
|
| Account & Telemetry |
Zero Accounts, Zero Ads: 100% on-device database. No telemetry, ad trackers, or remote user profiles.
|
Account required; cloud data storage; marketing analytics.
|
Cloud sync account usually required.
|
Built so your most private business stays yours.
Getting your digestion on track requires honest tracking. Rumblings is built so that it holds as little of it as possible: photos are analyzed and then wiped, never saved. They never touch your gallery, and your journal never leaves your phone.
Your Photos
Ephemeral by designA photo of your body is never saved as a file. It is sent to be identified, held in memory while you review the result, and then wiped. It never appears in your camera roll, never touches your photo gallery, and is never stored anywhere — on your phone or off it.
Your Journal
Stays on your phoneYour timeline, symptoms, meal records, and discovered health patterns live solely on your phone. You never create an account, you don't need a password, and zero copies are stored on developer servers. If you delete the app, your history is gone forever.
What Leaves
Strictly what you chooseThe photo being evaluated is sent to the AI service over an encrypted connection. Two optional features, both off until you turn them on, also send data: meal names, so they can be categorised, and summary statistics, so a finding can be described in words. Your diary notes and raw journal entries are never sent.
Health Connect
Your personal permissionsRumblings connects with your water and meal tracking so you don't have to enter things twice. You choose exactly what to share, and you can change or turn off permissions whenever you want in your phone's settings.
Zero Tracking
Never sold, never sharedNo advertising, no third-party tracking scripts, and no background profiling. Your health records are deeply private—they are never sold, traded, or shared with data brokers or anyone else.
Not on Google Play yet.
Rumblings is in active development and has not yet been publicly released. This page describes what it does today in internal testing, not a shipping commercial product. The privacy policy provides full documentation of how data is handled.
A journal, not a medical device.
Rumblings is your personal tool to decode daily habits and discover why your digestion is irregular. It helps you bring clear, structured history to your doctor if symptoms persist, but does not provide clinical diagnoses or medical treatment.