Crohn's. HBI on your phone.
The Crohn's hub is built around the same instrument your gastroenterologist scores you on: Harvey-Bradshaw. Daily HBI, Bristol-typed bowel-movement logging, the eight extra-intestinal complications HBI counts, and the seven labs that travel with Crohn's. One screen.
A chronic inflammatory disease of the digestive tract.
Crohn's disease is one of the two main forms of inflammatory bowel disease. It can affect any part of the gastrointestinal tract from mouth to anus, most commonly the ileum and proximal colon, and the inflammation tends to be transmural — it goes through the wall, which is why fistulas, abscesses, and strictures show up as the disease progresses. Onset is most often between 15 and 35 years old, with a smaller second peak in the 50s and 60s.
Day-to-day management lives in the gap between gastroenterologist visits — what flares look like, how bowel movements are changing, whether the extra-intestinal manifestations (joints, skin, eyes, mouth) are quieter or louder. The hub is designed for that gap.
Five components, scored live as you fill it in.
Harvey-Bradshaw is the most widely used clinical score for Crohn's activity — short enough to do every day, validated enough that your GI will recognize the numbers. Leo's diary fills in less than a minute. The total and severity band update live as you fill it out.
Severity band:
Bristol type, urgency, blood, mucus, pain — one BM, one record.
The bowel-movement log is the working surface of the hub. Each BM gets its own record with the fields a GI nurse would ask about anyway:
The hub aggregates the last seven days into a per-day frequency chart and a rolling Bristol average, so “am I getting worse or am I just having a bad week” has a number attached.
The eight toggles that count toward your score, spelled out.
Each of these adds one point to the HBI total. They're also the most important non-GI signals your gastroenterologist watches for — when they appear, it's worth flagging.
Joint pain — most common extra-intestinal manifestation.
Eye inflammation.
Tender red nodules, usually on the shins.
Mouth ulcers.
Painful ulcerating skin lesions.
Tear in the anal canal.
Abnormal connection — Crohn's-defining feature.
Walled-off collection of infection.
Six cards, no premium tab, seven labs pinned.
Open the hub and everything is there. If you track a menstrual cycle, the current phase is read from the Cycle hub and shown for context — many people with Crohn's see hormonally-timed flares.
Today's BM count, 7-day average Bristol type, latest HBI with severity color.
Today's score with severity band + 30-day mini trend chart.
Today's log + 7-day frequency bar chart by day of week.
Top 8 food tags from the last 30 days of symptoms with frequency bars.
Last 5 symptoms logged for Crohn's, with severity 1–10 and date.
CBC · CMP · Inflammatory · Iron · B12 / Folate · Vitamin D · Liver — all on the hub.
The list of things we'd like to ship, and haven't yet.
The Crohn's hub is intentionally focused — HBI, Bristol, complications, labs. The list below is what it doesn't do yet. Every item is on the feature-parity tracker, and the page updates as items ship.
Crohn's ships today; UC doesn't have its own pack yet. The Bristol logger and many of the symptom tags are usable for UC patients in the meantime via custom condition setup.
Calprotectin is the standard non-invasive marker of intestinal inflammation. It's not on the pinned Crohn's lab list yet — you can log it as a custom lab today.
Humira, Remicade, Stelara, Entyvio, Skyrizi — schedule, dose, infusion-day side effects, antibody / trough levels. Biologics can be logged in the general medications surface today; a dedicated biologic shelf isn't built.
Procedure record with prep, findings, biopsy results, Mayo / SES-CD grade where relevant. Today only generic appointment tracking.
Output volume, stoma care, pouch supplies. Not in app.
Anal fissure, fistula, and abscess are HBI toggles. Strictures and partial obstructions aren't separately tracked yet.
Toggles exist in HBI. Standalone trackers for primary sclerosing cholangitis labs, joint involvement, or skin lesions don't.
HBI trend, BM frequency, complication timeline, lab trend as one shareable document. Not yet — exports go through the general Leo health report.
HBI is the daily-use score; CDAI is the research-grade equivalent. Adding CDAI would let you mirror exactly what your GI's notes use.
The score your GI knows, done daily.
Harvey-Bradshaw, Bristol-typed bowel-movement logging, eight complication toggles, seven pinned labs, and a backlog we name out loud. Built for adults and kids with Crohn's and the parents and partners helping them through it.