RhythmX: Period Tracker
Private cycle, fertility, skin
About
This app helps you understand your menstrual cycle with a focus on privacy and simplicity. It offers insights into your cycle phases, custom tracking, and educational content without collecting your personal data. All data is stored on your device, and the app is open source.
What's New in RhythmX
2.1
November 13, 2026
Skin tracking: log where and how your skin looks each day with chips or a tap on a face and body map, then see where it flares over time and by cycle phase. Sex can be logged as a day tag. The Add Tags sheet now opens on Symptoms. Skin and sexual activity can also be included in your Doctor Report, with a switch for each. Everything stays on your iPhone. - Log with chips, or tap the face and body map. - See a body graph and a by-phase grid with a percentage in every box. Colours follow your chosen theme. - Sex is a day tag, counted with Intercourse so one day is never counted twice.
MoreSubscriptions & In-App Purchases
RhythmX Plus Yearly
PDFs, themes, widgets and calendar sync
Developer apps
FAQ
What is RhythmX?
RhythmX is a menstrual cycle tracker designed with a strong emphasis on user privacy and simplicity. It provides insights into your cycle phases, allows for custom symptom logging, and offers educational content, all while keeping your data securely on your device.
Does RhythmX collect my personal data?
No, RhythmX collects absolutely no personal data. It is built with a 'no data collection' policy, meaning everything you log stays on your device. There is no account creation, no analytics, and no network access required.
Is RhythmX open source?
Yes, RhythmX is an open-source application. This allows users to contribute to its development or review the code to verify how their data is handled, ensuring complete transparency.
What kind of insights does RhythmX provide?
RhythmX offers insights such as your current cycle phase at a glance, average cycle and period length, and an estimate of your next period. It also provides charts showing phase timing, your logged tags, and cervical mucus patterns over time.
Can I customize what I track in RhythmX?
Yes, RhythmX features custom tags that allow you to track what matters most to you. You can log symptoms, moods, energy levels, cravings, exercise, medication, and more, and edit or remove them at any time.
Does RhythmX have ads?
No, RhythmX is completely ad-free. The app explicitly states 'no ads' as part of its commitment to a clean and private user experience.
What platforms is RhythmX available on?
RhythmX requires iOS 26 or later and is currently supported on iPhones. It is designed with accessibility features like Dynamic Type and VoiceOver support.
Is RhythmX a medical device?
No, RhythmX is a tracking tool and not a medical device. The predictions it provides are estimates based on your logged cycles. For any health concerns, it is recommended to consult a healthcare professional.
