Fathom vs Aidy for Crohn's: AI Journal Feature Check

Fathom's listing describes reflective journaling; Aidy structures the full Crohn's record. Fathom's listing claims reflective check-ins and weekly summaries; Aidy connects logs to treatment, trends, and reports. The Foundation's IBD symptom tracker supports recording bowel movements and pain for clinician review.

Quick answer: For most people with Crohn's, choose Aidy for free structured daily logging, biologic management, modified HBI trends, and doctor reports. Fathom is the genuine exception for someone who values its advertised conversational journal and reflective weekly summaries above treatment structure.

Decision factor	Aidy	Fathom (public claims)
Best for	Structured Crohn's care	Claims reflective journaling
Daily IBD record	Stool, food, symptoms, treatment	Claims bowel, meal, symptom, activity logs
Treatment tools	Medicines and biologic schedules	Claims no comparable workflow
Reports and insights	Modified HBI and reports	Claims chat and weekly summaries
Access and cost	Free	Claims free tier and Pro
Overall pick	Aidy	Conversational-journal exception

Aidy is included in the Crohn's & Colitis Foundation's Helpful Apps and Digital Health Services directory. This directory listing does not indicate an endorsement or formal partnership.

Daily tracking: reflection or structured record

A Fathom IBD review should start with its low-pressure journaling. Its listing advertises morning and evening check-ins plus bowel, meal, and symptom logs. The developer claims bowel comparisons, chat summaries, and weekly reports from diary entries (Fathom’s shipped tracking features). Someone seeking an AI Crohn's journal may prefer that tone.

Aidy records meals by description or photo, stool using the Bristol Stool Chart, symptom severity, custom symptoms, medications, and check-ins in a unified feed. It then turns those entries into symptom timelines, food-symptom correlations, medication adherence history, and self-reported disease-activity trends (Aidy’s tracking and insight features). That structure makes Aidy stronger when the goal is a reusable Crohn’s record. Food patterns still deserve caution. NIDDK says researchers have not found that specific foods cause or worsen Crohn’s symptoms, though a clinician may recommend a food diary to identify foods that seem related to symptoms.

AI support and treatment tools

Fathom presents its AI as an empathetic companion available around the clock for meal questions, stress, or simply feeling heard. Its listing says the free app includes AI chat, while Fathom Pro promises a more personalized AI and smarter meal tracking. The public listing does not spell out the exact message or feature limits in each tier. Fathom’s terms add an important boundary: AI output may contain errors, and its health information is informational and cannot replace professional advice (Fathom AI disclaimer).

Aidy’s AI provides education and cannot give medical advice. It can use the user’s logs and biologic schedule to give source-backed information and suggest topics to discuss with a care team. The surrounding treatment system is the bigger difference. Aidy supports configurable induction and maintenance schedules, dose reminders, injection-site rotation, infusion and injection check-ins, route or interval changes, and a countdown to the next dose (Aidy biologic tools). Fathom’s current feature listing does not advertise comparable medication scheduling or biologic workflows. Neither app can determine whether inflammation is active. The AGA biomarker guideline evaluates fecal calprotectin, C-reactive protein, and other measures alongside symptoms, while NIDDK explains that Crohn’s assessment may also involve blood tests, stool tests, endoscopy, and imaging.

Reports, price, and access

Fathom’s listing presents its weekly insights as personal reflection and does not currently advertise a clinician-formatted export. Aidy explicitly offers physician-friendly reports containing trends, charts, timelines, food correlations, adherence consistency, and a modified Harvey-Bradshaw Index for Crohn’s. That makes Aidy easier to use as an appointment-preparation tool. Digital monitoring can support ongoing care, though expectations should stay measured: a Cochrane review of remote IBD care found web monitoring broadly similar to usual care for disease activity and flare outcomes.

The listing makes Fathom app price details clear: a free download plus Pro subscriptions. In August 2026, it shows a two-week trial attached to $7 monthly or $59 yearly options, alongside $7 monthly and $69 yearly entries without a trial (US App Store). Fathom's subscription terms say paid subscriptions renew automatically unless canceled. The listing says the free tier remains usable, with deeper personalized AI and smarter meal tracking behind Pro. Aidy is free for users with no paid subscriptions and is available as an iPhone app or by text, which gives people an option requiring no installation. The listing marks Fathom 18+ and Aidy 13+.

Privacy and the better Crohn’s fit

Both apps handle sensitive information, so their privacy language matters. Fathom says it collects account details, chats, photos, voice transcriptions, food and sleep logs, symptoms, medications, procedures, and device-use information. Its policy also describes analytics and advertising partners, targeted advertising, and possible sharing with advertising partners for marketing (Fathom privacy policy). Aidy encrypts data, lets users export or delete it, and does not sell user data or run ads. Those policies deserve a personal review before either app becomes a daily health record.

Fathom appeals to adults who value emotional check-ins. As a Crohn's companion app, Aidy is the better Fathom alternative because it joins everyday context to adherence, biologic logistics, trends, and care-team reports. Free access and text tracking strengthen that advantage.