Flo

Flo is the world's most popular period and health tracking app, with over 380 million users globally and a dedicated PCOS mode built specifically for women with polycystic ovary syndrome. Available free on iOS and Android, Flo for PCOS gives you a cycle tracker that actually understands irregular cycles — not one that assumes a 28-day template fits every body. If you're searching for a flo app pcos solution or a reliable flo period tracker for pcos, this is the most widely used starting point.

Why It Helps With PCOS

The core problem with standard period trackers is that they're built for regular cycles. Flo's dedicated PCOS mode changes the prediction algorithm entirely — instead of assuming ovulation on day 14, it widens the fertile window, accounts for anovulatory cycles, and stops penalizing you for being "late." This alone makes Flo dramatically more useful than generic trackers for PCOS.

Beyond cycle prediction, Flo lets you log over 70 symptoms, including PCOS-specific ones like excess hair growth (hirsutism), acne, bloating, weight changes, and fatigue. Over time, it shows you how your lifestyle habits — sleep, stress, exercise, water intake — correlate with your symptom patterns. For a condition as variable as PCOS, this longitudinal data is genuinely useful.

Flo Health also employs a medical advisory board and publishes evidence-informed articles specifically about PCOS inside the app. This isn't just a tracker — it's a health education platform.

How to Use Flo for PCOS

1. Enable PCOS mode — After downloading, go to Settings → Health Profile → Cycle type and select PCOS. This reconfigures cycle predictions to handle irregular and unpredictable cycles.
2. Log symptoms every day — Tap the daily log and record symptoms, energy, skin condition, and mood. The more data you add, the more useful Flo's pattern analysis becomes.
3. Track BBT if you're measuring it — Flo supports basal body temperature logging. If you take your temperature every morning before getting up, Flo uses it alongside other data to estimate ovulation attempts.
4. Log medications and supplements — Record metformin, inositol, birth control, or any other PCOS protocol you're on. Flo can send reminders and track adherence.
5. Use the AI health assistant — Flo's AI can answer specific PCOS questions. Think of it as a first-pass resource before a doctor visit, not a replacement for one.
6. Check the PCOS health library — Inside the app, filter the Health Library for PCOS to find articles written by Flo's medical team on cycle irregularity, fertility, diet, and symptom management.

Key Features for PCOS

• Dedicated PCOS mode — algorithm adjusted for irregular ovulation and anovulatory cycles
• 70+ loggable symptoms — including PCOS-specific symptoms like hirsutism, acne, and weight changes
• BBT tracking — basal body temperature logging for ovulation pattern analysis
• Medication and supplement reminders — track your PCOS protocol with daily notifications
• PCOS health library — medical-reviewed articles written specifically for polycystic ovary syndrome
• Anonymous community — connect with other women managing PCOS without revealing your identity
• AI health assistant — ask questions about your symptoms and get personalized guidance
• Free tier — the core features including PCOS mode are available without a subscription
• Premium — deeper insights, predictive analytics, and unlimited cycle history ($13/month or $55/year)

How It Compares

Clue is Flo's closest competitor. Clue is more scientifically rigorous — it was co-developed with university researchers and allows you to export your health data as a PDF for doctor appointments, which Flo doesn't do as cleanly. However, Clue doesn't have a dedicated PCOS mode. For most women starting out with PCOS cycle tracking, Flo's PCOS mode is a more immediately useful feature.

Natural Cycles takes a different approach entirely — instead of predicting your cycle from historical patterns, it uses basal body temperature to confirm ovulation after it happens. For PCOS women who need certainty about whether they actually ovulated (not just a prediction), Natural Cycles is more reliable — but requires more commitment and a subscription.

If you want a tracker built specifically around PCOS rather than adapted from a general app, PCOS Polly was designed ground-up for the condition and tracks the full PCOS symptom cluster in more granular detail.

Getting Started

Download Flo free from the App Store (iOS) or Google Play (Android). Enable PCOS mode during onboarding or in Settings afterward. The free tier is sufficient for most PCOS women — cycle tracking, PCOS mode, symptom logging, and the health library are all included without a subscription.