The Period Tracker App That Knows How to Keep a Secret
about the client
Mooneva is a private, offline period tracker designed and developed by Måneva AB, based in Solna, Sweden. Built on the principles of Scandinavian minimalism and digital rights, Mooneva was created for women who refuse to trade their most intimate health data for a free app. Unlike most period trackers that run on cloud servers and share data with third parties, Mooneva stores everything locally on the user's device, encrypted, offline, and completely private. No accounts. No servers. No data collection of any kind.
- Location: Solna, Sweden
A Cycle Tracker That Puts Privacy Before Everything
The mission was to build a period tracker that treats women's health data the way it deserves to be treated as a private health log, not a product. By combining bank-grade local encryption with an intelligent adaptive algorithm, Mooneva gives women accurate cycle tracking and total data ownership in one beautifully simple app.
Tech Stack:
- Duration: 6 Months
Our approach
Most period tracking apps are free because the user's data is the real currency. The challenge was to build something genuinely different, a completely free app that carries no ads, collects no data, and still delivers highly accurate cycle predictions. Convincing users who had grown used to cloud-based apps to trust a fully offline solution required both strong technical execution and an even stronger design language.
Let’s Make It Happen
We don't overcomplicate things. We break it down, keep it simple, and make sure things get done. Ready to crush it? Let's get started!
Defined the core privacy-first architecture: no accounts, no cloud, no third-party sharing. Mapped the full user journey from first launch to long-term cycle history management.
Designed a neumorphic, soft UI in Figma rooted in Scandinavian minimalism, calm, clean, and easy to navigate for users of all comfort levels with technology.
Built a fully offline app with local PBKDF2/AES-GCM encryption. Developed the adaptive prediction algorithm, symptom logging system, camouflage mode, and encrypted backup feature.
Tested cycle prediction accuracy across regular and irregular cycle patterns. Refined PMS alerts, phase-based mood tracking, and multilingual support across six languages.
Published on Google Play with zero onboarding friction, no sign-up required. Continuous updates rolled out, including clinical report enhancements, PDF generation fixes, and UI refinements.
Defined the core privacy-first architecture: no accounts, no cloud, no third-party sharing. Mapped the full user journey from first launch to long-term cycle history management.
Designed a neumorphic, soft UI in Figma rooted in Scandinavian minimalism, calm, clean, and easy to navigate for users of all comfort levels with technology.
Built a fully offline app with local PBKDF2/AES-GCM encryption. Developed the adaptive prediction algorithm, symptom logging system, camouflage mode, and encrypted backup feature.
Tested cycle prediction accuracy across regular and irregular cycle patterns. Refined PMS alerts, phase-based mood tracking, and multilingual support across six languages.
Published on Google Play with zero onboarding friction, no sign-up required. Continuous updates rolled out, including clinical report enhancements, PDF generation fixes, and UI refinements.
Blending Privacy With Purpose
Mooneva's approach combined offline-first engineering with Scandinavian design sensibility, creating a period tracker that feels as secure as it is beautiful to use every day.
- Privacy Architecture: No accounts, no servers, no cloud; every byte of health data stays encrypted locally on the user's device only.
- Adaptive Intelligence: A smart prediction algorithm that learns from real cycle history to deliver accurate period and ovulation forecasts, including full irregular cycle support.
- Discreet by Design: Camouflage mode disguises the app as a Task Manager, giving women complete control over who sees what on their phone.
- Total Data Ownership: Encrypted personal backups and a one-tap nuclear wipe give users irreversible control over their own health history at any moment.
Project Results
- Engagement Growth: 58% increase in daily active users within the first 60 days of launch, driven purely by organic word of mouth among privacy-conscious women.
- User Retention: Over 70% of users continued tracking beyond the first month — significantly above the health app industry average.
- Positive Reviews: 4.6 average rating on Google Play for accuracy, privacy, and overall ease of use.
- Global Reach: Successfully adopted across 6 language markets within the first quarter post-launch.
