Luna FemTech is a cycle tracking app for iOS and Android, built and operated by a Spanish company and hosted entirely in the European Union. It covers the whole life cycle rather than the fertile years alone: menstrual cycle, pregnancy, postpartum, breastfeeding, and the transition through perimenopause and menopause. A separate mode documents fertility treatment.
What you log is encrypted on your device with AES-256 before it is synced, so the servers hold only ciphertext. Those servers are self-hosted on Hetzner Cloud in the EU, and there is no US cloud provider in the core data chain. An optional Maximum Privacy mode keeps the encryption key on your device alone, which makes recovery by the company technically impossible.
The independent Exodus Privacy report finds a single tracker, Sentry for crash reporting, with no advertising SDK, no advertising ID and no location permission. The app is funded by subscriptions and one-time passes; it shows no ads and sells no data.
Luna is deliberately not the most minimal option, and it says so. It is not open source yet, an account is required for sync across devices, and the optional AI nutrition coach is asked anonymously but is not zero-knowledge. If auditability and local-only storage are your first criteria, drip and Euki serve you better. Luna is built for people who want sync, doctor-ready PDF reports and support across all four life phases while their data stays in the EU and encrypted on the device.
Luna is not a medical device. It documents and reminds; it does not diagnose and does not give treatment advice.
Available in 24 languages across 31 countries.