Bloom is the AI-powered period, fertility, and pregnancy tracker that learns your body's patterns. Three experts in one app — gynaecologist, mental health coach, and productivity advisor — all personalized to where you are in your journey.
Smart tracking, AI insights, and beautiful design — in one app that truly understands your body.
A stunning glassmorphic ring shows your cycle phases at a glance — period, follicular, ovulation, luteal, PMS. The glowing indicator marks today with your current phase.
Weighted moving averages + trend detection — not static math. Confidence scores with every prediction. Anomaly alerts when a cycle is significantly different from your norm.
Daily conception probability (Bayesian model), BBT/CM/OPK tracking, ovulation detection, AI fertility insights, and auto-generated conception reports each cycle.
One tap switches to full pregnancy tracking — gestational age, trimester-specific tips, 18 symptom types, milestone timeline, due date countdown, and prenatal health guidance.
On-device AI detects patterns, correlates symptoms with cycle phases, scores your wellness (0–10), and predicts upcoming changes — all without sending data anywhere.
Period reminders 2 days ahead. Fertile window alerts. Ovulation day. Pregnancy milestones. Due date countdown (30/14/7/1 day). All as real system notifications.
Bloom covers the entire fertility journey — daily conception probability when you're trying, and week-by-week tracking once you're pregnant.
Bayesian model (based on Wilcox 1995 fertility study) calculates your real-time probability using cycle day, BBT, cervical mucus, and OPK results.
Log BBT daily — Bloom's CUSUM algorithm detects the thermal shift that confirms ovulation. Also tracks cervical mucus and OPK test results.
Auto-generated each cycle showing intercourse timing relative to ovulation — classified as optimal, good, or low-probability. See your overall likelihood.
GPT-4o analyzes your fertility data — BBT patterns, CM trends, cycle regularity — and gives personalized recommendations for optimizing conception.
Adapts to your cycle history. Irregular cycles? The window automatically widens. Consistent cycles? Pinpoint accuracy with confidence scores.
Preconception checklist — folic acid, dental visit, vaccinations, blood tests, and more. Track your preparation for a healthy pregnancy.
One tap switches Bloom from cycle tracking to full pregnancy mode. Enter your LMP date — Bloom calculates your due date, gestational age, and transforms into your pregnancy companion.
Gestational age (weeks + days), progress bar toward due date, trimester indicator, and days-until-due countdown — always visible on your home screen.
Log mood (7 options) + 18 pregnancy-specific symptoms: morning sickness, nausea, fatigue, breast tenderness, food cravings, heartburn, back pain, swelling, and more.
Heartbeat (week 6), anatomy scan (week 20), viability (week 24), full term (week 37), due date (week 40). Notifications for each milestone as it approaches.
Weekly updates on what's happening with your baby — organ formation in T1, movement in T2, growth and positioning in T3. Changes every week.
Phase-specific dietary guidance — iron and folate in T1, calcium and protein in T2, omega-3 and fiber in T3. Practical food recommendations.
Folic acid reminders, prenatal checkup schedules, exercise guidance, and healthcare reminders — all tailored to your current trimester and week.
Lily isn't just a chatbot. She's a gynaecologist, mental health coach, and productivity advisor — all in one warm, trusted voice that knows your cycle phase, pregnancy week, and recent symptoms.
OB-GYN level knowledge about your cycle, hormones, symptoms, fertility, and pregnancy. Phase-specific nutrition and exercise advice. Adapts to pregnancy mode automatically.
Connects your mood to your hormones. Offers grounding techniques, breathing exercises. Supports prenatal anxiety and pregnancy mood changes. Knows when to suggest professional help.
Cycle-sync your work. Know when to tackle hard tasks, start new habits, or rest. Energy management matched to your hormonal patterns and trimester.
Lily auto-detects which role you need. Ask about cramps → gynaecologist. Feeling anxious at 28 weeks → prenatal mental health. Need focus → productivity coach. Every response includes your current cycle day or gestational week for context.
Share cycle insights with your partner — fertility windows, mood updates, and cycle summaries. All end-to-end encrypted.
Generate a code, share it with your partner. They enter it in their Bloom app. Paired in seconds.
Encryption keys are exchanged during pairing. The server only sees encrypted blobs — zero knowledge of your data.
Choose exactly what to share: fertile window, mood, cycle summary, or symptoms. Toggle each one independently.
Optional cloud storage syncs your data across devices. Create an account, log in anywhere. Local-first by default — you choose when to enable cloud.
Build daily logging streaks. Earn 11 badges for consistency. Level up from Seedling to Radiant. Gamification that keeps you engaged.
Protect your sensitive health data with Face ID or fingerprint. The app locks when you leave and unlocks with your biometrics.
Tap any day to see its cycle phase. Color-coded periods, fertile windows, ovulation, and PMS. In pregnancy mode: weekly progress and key dates.
Invite friends and earn extra Lily messages. 5 referrals = 15 messages. 25 referrals = unlimited. Share the love.
No internet? No problem. All tracking, predictions, and insights work entirely offline. Your data never needs a server.
Free on Google Play. Choose language, pick local or cloud storage, enter your last period date. No account needed.
Tap your flow, mood, or symptoms — takes 10 seconds. Add BBT if you're trying to conceive.
After 2-3 cycles, ML kicks in. Predictions get personal. Conception probability becomes accurate.
Use the fertility dashboard when trying. Switch to pregnancy mode with one tap when you're expecting.
From your first tracked period to your baby's due date — one app, one history, one companion.
Cycle predictions, phase visualization, flow logging, mood tracking, health score, and anomaly detection.
Insights engine detects phase-mood correlations, symptom patterns, and cycle trends. ML predictions sharpen over time.
Daily conception probability, BBT/CM/OPK tracking, ovulation confirmation, AI fertility insights, and conception reports.
One-tap mode switch. Week-by-week development, symptom tracker, milestone timeline, trimester nutrition, and due date countdown.
Bloom is a free, privacy-first period and pregnancy tracker for Android that uses machine learning to predict menstrual cycles with 85-90% accuracy. It includes an AI health companion called Lily (powered by GPT-4o) that provides personalized gynecological, mental health, and productivity guidance based on the user's current cycle phase or pregnancy week.
Unlike most period trackers, Bloom covers the entire reproductive health journey — from basic period tracking to active fertility planning (with daily conception probability using the Wilcox Bayesian model) to full pregnancy monitoring with 40+ milestones and trimester-specific guidance.
Bloom stores all data on the user's device by default (no account required) and offers optional end-to-end encrypted cloud sync. It does not show ads or sell user data. The app is developed by Metanetica and available on Google Play.
| Feature | Bloom | Flo | Clue | Natural Cycles |
|---|---|---|---|---|
| AI chat with cycle context | ✓ | ✗ | ✗ | ✗ |
| ML-powered predictions | ✓ | Partial | Partial | ✓ |
| Daily conception probability | ✓ | ✗ | ✗ | ✓ |
| BBT + CM + OPK tracking | ✓ | ✗ | Partial | ✓ |
| Pregnancy mode + milestones | ✓ | ✓ | ✗ | ✗ |
| Couple mode (encrypted) | ✓ | ✗ | ✗ | ✗ |
| Local-only storage option | ✓ | ✗ | ✗ | ✗ |
| Free with no ads | ✓ | ✗ | ✓ | ✗ |