Support
CrohnOlogy is a private family project, maintained with care. Here's how to get help.
- Contact
- Email: hello@crohnology.net
- Response time: best-effort. This is a hobby project built around a real family's needs, not a staffed support desk, but every message is read.
- App details
- Name: CrohnOlogy
- Package:
com.brusulaf.crohnology - Current version: 1.3.3
Frequently asked questions
How do I add a family member?
Only a family Admin can invite new members.
- Open Family Settings → Add Member.
- Enter the email address of the person you want to invite.
- The app generates a unique QR code containing encrypted invitation data.
- Share the QR code with the invitee by email, message, or in person.
The invitation is stored securely with encryption until it's used.
How do I join a family?
- Sign in with your Google account.
- Scan the QR code the Admin shared with you, using the camera or by importing an image from your gallery.
- The app performs a secure ECDH key exchange to receive the family encryption key.
- You join the family with the role the Admin assigned.
New phone? How do I recover my key?
Sign in on the new device and enter the Family Recovery Passphrase when prompted. CrohnOlogy derives your encryption key from the secure cloud backup (using PBKDF2 with 600,000 iterations) and restores full access to the family timeline.
If recovery doesn't work, ask your family Admin to re-invite you, which performs a fresh ECDH key exchange.
What are the roles?
- Admin: full access; can invite members and manage roles.
- Member: full access to log, view, edit, and delete entries.
- Viewer: read-only access to the Journal timeline.
Can I export my data?
Not yet. Because all data is encrypted on-device before upload, exporting it in a readable format requires work that is on the backlog. This is a priority for future updates.
Is my data really private?
Yes. Every symptom, note, and photo is encrypted on your device with AES-256 before it is uploaded, and the encryption keys never leave your phone. Not even the hosting provider can read your data.
See the Privacy Policy for full details.
How do I delete my account and data?
You're always in control. You can delete your account and its associated data at any time, right from within the app:
- Open Settings → Danger zone → Delete account.
- Confirm with the biometric prompt and the on-screen confirmation step.
Deletion is permanent. It removes your encrypted key backups, device keys, family membership, and sign-in account. Your symptom entries stay in the shared family timeline so the symptom history isn't lost — but your name is removed from them and they'll show as logged by "Past member".
If you're the family Admin: with other members, transfer the Admin role first; as the only member, deleting your account permanently removes the entire family and all of its data.
Is this only for Crohn's?
No. CrohnOlogy was built originally for a child with Crohn's disease, but it's useful for any gastrointestinal journey, including ulcerative colitis and other IBDs, IBS, and general GI symptom tracking.