Aube
Symptothermal tracking app
A menstrual cycle tracking app based on the Sensiplan method: a tested interpretation engine and end-to-end encrypted privacy.
Background
Many women want to understand their cycle better without necessarily resorting to hormones, but serious natural methods are known to be complex to learn. We needed a rigorous, educational and caring cycle tracking tool that a non-specialist could use every day, based on the Sensiplan method (the best scientifically documented symptothermal method). Strong constraint: cycle data is ultra-sensitive (GDPR article 9), so privacy is the foundation. Clear positioning: Aube is a tool for observing and understanding the cycle, not a medical device, and makes no contraceptive claims.
Goals
Make symptothermal tracking (Sensiplan method) accessible, reliable and pleasant every day: a simple morning entry, a clear temperature curve, a daily status always explained in plain language, and a real learning path, in a soothing identity and an architecture built for the strictest privacy.
- A simple morning entry
- A clear temperature curve
- A daily status explained in plain language
- End-to-end privacy
What we did
A complete creation journey, from the method to the native app.
- Methodological and regulatory framing: Sensiplan, “observation tool” positioning, GDPR
- Specification of more than 120 features across 11 modules
- Custom Sensiplan interpretation engine, covered by automated tests
- Strict safeguard against any falsely reassuring signal
- Soft identity (plum, coral, eucalyptus) and high-fidelity mockups screen by screen
- Native React Native / Expo app, local-first storage
- End-to-end encrypted backup (zero-knowledge) on a backend that cannot read the data
- GDPR consent, learning content and self-assessment
See the full details
A complete creation journey, from the method to the app. Methodological and regulatory framing (Sensiplan, “observation tool” positioning, GDPR file and user instructions). Detailed specification (more than 120 features across 11 modules). Custom Sensiplan interpretation engine (baseline, rule of 3 high temperatures out of 6, peak day of mucus plus 3, double check) covered by an automated test suite, with the cardinal safeguard “when in doubt, the day is considered fertile”. Soft visual identity (plum, coral, eucalyptus, crescent moon logo) and high-fidelity mockups screen by screen. Native React Native / Expo development, local-first storage, end-to-end encrypted zero-knowledge backup (PBKDF2 derivation, AES encryption, HMAC integrity) behind a containerized backend that cannot read the data. GDPR consent screen, learning content and self-assessment in the style of a driving theory test.
Results
A complete, working native app, in real-world testing with users. 5 spaces (Home, Calendar, Curve, Summary, Learn), more than 120 features specified across 11 modules, an interpretation engine covered by automated tests, and operational end-to-end privacy (zero-knowledge, the server cannot read the data). A journey delivered from the scientific method all the way to encrypted backup.
Why it really works
Because we treated a demanding clinical method with the rigor it deserves: a tested interpretation engine, a strict safeguard against any falsely reassuring signal, end-to-end privacy on some of the most sensitive health data, and a design built to reassure without ever causing anxiety. From the scientific method to the native app, no shortcuts.
- A tested interpretation engine
- A strict safeguard against any falsely reassuring signal
- End-to-end privacy on sensitive data
- A design that reassures without ever causing anxiety
Let's talk about your ideas
Take 30 minutes. We analyze your situation, no sales pitch, no commitment. If it makes sense, we move forward. If not, you leave with a clearer vision.