IBD Symptom Logger vs Aidy: Two Free Crohn's Apps Compared

IBD Symptom Logger's listing describes a free local diary; Aidy adds Crohn's treatment tools, trends, education, and reports. A systematic review groups IBD app functions across monitoring, education, counseling, and treatment. This IBD Symptom Logger review compares those practical roles.

Quick answer: For most people with Crohn's, choose Aidy for free treatment-aware logging, modified HBI trends, education, and reports. IBD Symptom Logger is the exception for its advertised offline, account-free iPhone or iPad logging with calprotectin fields and CSV export.

Decision factor	Aidy	IBD Symptom Logger (public claims)
Best for	Complete Crohn's record	Claims offline logging
Daily IBD record	Food, stool, symptoms, treatment	Claims food, sleep, stress, calprotectin
Treatment tools	Detailed biologic schedules	Claims no comparable workflow
Reports and insights	Modified HBI and reports	Claims graphs and CSV export
Access and cost	Free	Claims free, ad-free iPhone and iPad use
Overall pick	Aidy	Local-data 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.

What IBD Symptom Logger currently includes

The exact product is IBD Symptom Logger by David Sanders, listed for iPhone and iPad. Its store page says it works entirely offline, requires no login or account, keeps entries on the device, and has no subscription, in-app purchase, hidden cost, or advertising. Apple also displays the developer's declaration that the app collects no data, while noting that Apple has not independently verified that declaration.

The logger’s listing says users can record meals, drinks, stool types, pain, tiredness, stress, sleep, notes, and general symptoms. Its current version history claims support for urgency, appetite, fever, nighttime waking, calprotectin trends, improved severity graphs, and local profiles for family members. The listing also says data can be exported as a profile-specific comma-separated values file. That makes it a credible offline Crohn's tracker, especially when fast entry, a private symptom logger, or a spreadsheet for personal analysis is the priority.

Compare food, stool, biomarkers, and analysis

IBD Symptom Logger’s listing names several raw fields, particularly sleep, stress, fever, nighttime waking, urgency, and calprotectin. Based on those fields, it has an edge in raw-detail breadth. Its store listing also describes simple patterns between foods and worsening symptoms. A food diary can help identify foods that seem related to symptoms, according to National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) guidance. The app's own disclaimer says these associations are not clinically validated and do not prove causation.

Aidy includes meal capture, Bristol stool logging, customizable symptoms, longitudinal food-symptom correlations, and a modified Harvey-Bradshaw Index (HBI). HBI is prominent in Crohn's clinical practice, as described in recent peer-reviewed research. Both approaches remain self-tracking. The American Gastroenterological Association guideline recommends a combined symptom-and-biomarker monitoring strategy for Crohn's.

Aidy goes further on treatment and appointment preparation

Aidy is stronger once treatment becomes part of the comparison. It includes medication-adherence tracking, configurable biologic induction and maintenance schedules, dose reminders, injection-site rotation, post-dose check-ins, and a countdown to the next injection or infusion. Aidy also includes trend analysis, physician-friendly reports, and a learning center covering Crohn's, ulcerative colitis, medicines, symptoms, nutrition, and daily management.

IBD Symptom Logger’s listing describes a simpler route: a detailed CSV that users can print or share. Aidy turns logs into a structured treatment timeline and doctor-ready report. NIDDK explains that Crohn's treatment varies with symptoms, inflammation location, and other individual factors. Treatment choices remain with clinicians. Aidy organizes more of the information surrounding a clinician-directed plan.

Privacy, price, and platform differences

IBD Symptom Logger offers the cleaner data-minimization model. Its developer says health entries stay locally on the device, with no account and no collection. Aidy's model supports connected analysis and reports. Aidy collects account, voluntarily entered health, device, and usage data and uses service providers for cloud hosting and storage. Aidy encrypts data, does not sell it or display advertising, and lets users request export or deletion. Privacy-conscious users therefore face a real choice between local isolation and connected features.

Native access also differs. IBD Symptom Logger lists iPhone and iPad compatibility. Apple lists Aidy as iPhone-only, while Aidy offers an SMS-based experience. For a “free IBD app no ads” search, IBD Symptom Logger’s developer promises exactly that, while Aidy is also free with no ads and no paid user subscriptions. Aidy includes the more complete free treatment and reporting workflow.

Which free Crohn's app is the better fit?

IBD Symptom Logger is an excellent choice when local storage, offline access, zero account setup, explicit calprotectin entry, and flexible CSV data matter most. It provides unusually good private logging for free, with broad raw fields and minimal setup.

For an IBD Symptom Logger alternative after a Crohn's diagnosis, Aidy is the better primary companion. It connects symptoms and meals with adherence, biologic planning, disease-activity trends, education, and a care-team report. Its connected model asks for more trust than local storage while providing a more complete free treatment workflow. Aidy is the stronger whole-disease default.

That context is the deciding advantage for care.