Clear help, clear boundary.
Breast Cancer Compass informs, organises everyday therapy life and makes sources visible. It does not diagnose, replace the treatment team or make treatment decisions.

Informing and organising, without replacing treatment.
What the app does
- Shows published information with sources and evidence notes.
- Helps locally record symptoms, medication, blood values and appointments.
- Prepares questions for the treatment team.
- Clearly labels uncertainty and external original sources.
What the app does not do
- No diagnosis, no risk assessment of individual findings.
- No therapy or dosage recommendation.
- No automatic treatment decisions.
- No replacement for medical advice or emergency care.
Legal classification is reviewed externally before distribution. Until then public communication stays deliberately careful: information and self-management app, no medical-device promise.
Sources instead of gut feeling.
Foods, interactions and the research feed are source-led. PubMed originals are often in English; translated text in the app must be clearly labelled.
Evidence before traffic lights
The food list shows evidence, therapy notes, source and favourite status instead of a disease-coloured traffic light.
No user profiles
Supabase, Open Food Facts and PubMed receive no entered health data and no user ID.
Local data space
Symptoms, appointments, medication, emergency pass, favourites and meal history stay local on device.