Your mood, energy and focus shift with your hormones. See your own pattern across your cycle, from what you log, not a 28-day average.
Finally understand why you feel off before your period. Track mood, energy, and symptoms.
Your data stays yours. No selling.
My Body's BFF turns your cycle into insight, so you finally understand why one week you feel unstoppable, and the next you're sad about a text message. It's like having a wise, supportive friend in your pocket who actually gets it.
WHY IT'S DIFFERENT
Pattern detection across mood, energy, sleep, stress, and symptoms, not just period dates
Inner Winter, Spring, Summer, Autumn. your hormone cycle in language that actually makes sense
Short tools for real moments: luteal anxiety, ovulation confidence, menstrual exhaustion
WHAT YOU'LL ACTUALLY EXPERIENCE
The relief of finally knowing: "That's progesterone, not me. Promise."
Predictions that get smarter with every cycle you log
Patterns you'd never notice on your own like how poor sleep on day 22 leads to mood crashes on day 25
A toolkit for your hardest days
WHO IT'S FOR
Anyone who feels "off" before their period and doesn't know why
Anyone tired of period trackers that only count days
Anyone who wants to understand their hormones, not just predict their next bleed
Anyone tracking PMS, mood swings, or irregular cycles and looking for real patterns
WHAT YOU GET
Cycle and hormone phase tracking with personalized predictions
Daily mood, energy, sleep, stress, and symptom logging
Pattern detection across your full cycle
Phase-specific tools for PMS, ovulation, and everything between
A beautiful, easy calendar
Stop wondering why you feel this way. Start understanding. Whether it's mood swings, sudden energy, weird cravings, or moments of zen. My Body's BFF helps you connect the dots and figure out what's actually going on.
Not a medical tool. Not a replacement for therapy.
Ratings & Reviews
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Your mood, energy and focus shift with your hormones, every month. My Body's BFF shows you your own pattern, so "why am I like this today?" becomes "it's that week again, and now I know why."
Not a date on a calendar. A phase.
YOUR PATTERNS, NOT THE AVERAGE WOMAN'S
See which hormone phase you're likely in today, and what that has meant for you before
Patterns from your own logs, with the receipts: "fatigue on 8 of your 11 luteal days"
A weekly look ahead built only from your own data. Not enough data yet? It shows your progress instead of guessing
Predictions from your own cycle length, not a textbook 28 days
LOG IN SECONDS
Four sliders: mood, energy, stress, sleep
Period, symptoms, feelings, your day and food in one screen
The app opens what fits your phase first, and your own most-logged items come first
FOR YOUR HARDEST DAYS
Short tools per phase, built on ACT and CBT by a psychologist
A clear PDF overview of your cycles and symptoms to take to your doctor
YOUR DATA STAYS YOURS
No ads. No selling. No tracking SDKs
Export or delete everything, any time
ALSO
Optional LH test and temperature (BBT) logging
A mode for hormonal contraception
Share your phase with a partner, if you want to
Your phases as inner seasons: Winter, Spring, Summer, Autumn
Dark mode
Built by a psychologist. No team, no investors asking for your data.
My Body's BFF does not diagnose anything and is not a contraceptive or fertility tool. Period pain that stops your life is not something to endure quietly: talk to a doctor.
Version 2.3.0
The developer, od ooster, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Health & Fitness
Contact Info
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
od ooster
Size
58.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 15.0 or later.
iPhone Requires iOS 15.0 or later.
iPad Requires iPadOS 15.0 or later.
iPod touch Requires iOS 15.0 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.