Bloom turns your temperature, hormones, and cycle history into one daily read: am I fertile today, yes or no. No calendar math. No 28-day fiction. No two-week-wait spiral — just the rhythm your body has always had, finally written down.
Built with clinicians, trusted in the room where it counts
Most apps draw the textbook 28-day curve and hope your body plays along. Bloom learns your actual pattern — every irregular month, every late ovulation, every signal you were already giving off and no one was reading.
Bloom doesn't infer your fertile window from a calendar. It reads your basal temperature shift and LH surge together to confirm ovulation actually happened — the line between a guess and a fact.
PCOS, perimenopause, post-pill, postpartum. The patterns that other trackers quietly give up on are the ones Bloom was built around. The longer it learns you, the tighter every window gets.
Log cramps, mood, sleep, and energy in two taps and watch them snap into line against your hormones. The bad days stop being random — they get a name, a phase, and a pattern you can plan around.
Flip to TTC and Bloom surfaces your two highest-odds days, one quiet daily nudge, and a cycle log your fertility clinic can read without translation.
Your cycle data is encrypted end to end and never sold, shared, or handed to advertisers. Delete everything in one tap and it is gone — wiped, not archived behind a setting.
Numbers from inside the data
Nothing here is mystical. It's the same biomarkers fertility specialists rely on — measured daily, learned over months, and explained line by line so you never have to take our word for it.
The small, unmistakable rise that only follows ovulation. Bloom filters out the noise from broken sleep, a late glass of wine, or a cold to find the shift that's real.
Sync your LH strips and Bloom times the surge to the hour, pinpointing the 24 to 36 hours that decide the whole cycle.
Every cycle you log sharpens the next forecast. Bloom adapts to your real luteal length instead of forcing the textbook average onto a body that never read it.
Tap any forecast to see exactly which signals drove it and how sure Bloom is. No black box. No blind trust. Just the math, on the record.
Open the app and you get one clear read, not a wall of charts to decode. Here's how a single cycle unfolds, phase by phase.
A soft, low-pressure start. Bloom tracks flow and cramps and quietly resets the model for the cycle ahead — no fertility noise on the days you don't need it.
Energy climbs and your forecast climbs with it. Bloom opens the predicted fertile window early, so the timing never sneaks up on you.
Your highest-odds days, marked in bold. LH surge and temperature confirm it as the days pass — not a maybe, a measured yes.
Not a prediction anymore. Once the temperature shift holds, Bloom marks ovulation confirmed and dates it to within half a day.
The two-week wait, with the panic dialed down. Bloom watches for early signs, flags a luteal phase that's running short, and tells you the right morning to test.
A one-screen recap of your length, ovulation day, and symptom patterns — clean enough to hand your doctor and skip the guesswork.
“Three apps swore I ovulated on day 14. My body did it on day 21, every time. Bloom was the only one that worked out my actual cycle — I was pregnant four months after I switched.”
“I have PCOS, so 'your fertile window is days 12 to 16' was always a punchline for me. Bloom stopped pretending I was textbook and started learning the cycle I actually have.”
“My fertility specialist asked how I had such clean ovulation data. I just turned my phone around. Bloom's export saved us two appointments and a month of second-guessing.”
Start tracking your cycle today for nothing. Upgrade when you want confirmation, depth, and clinic-ready exports — cancel in two taps, no exit interview.
Everything you need to know your cycle.
For confirmed answers and trying to conceive.
Plus, with a human in your corner.
Bloom is a fertility-awareness and conception tool, not a contraceptive. It can show you your fertile window, but we never market it as birth control. For pregnancy prevention, talk to your healthcare provider about a clinically validated method.
Yes — that's the entire reason it exists. Bloom learns your individual pattern instead of assuming a 28-day cycle, so irregular, PCOS, post-pill, and perimenopausal cycles get more accurate the longer you track, not less.
No. Bloom works with cycle and symptom logging alone on the free plan. To confirm ovulation on Bloom Plus, you can sync a basal thermometer and LH strips — both inexpensive and sold at any pharmacy.
It stays yours. Bloom encrypts your data end to end, never sells or shares it with advertisers, and lets you export or permanently delete every record in one tap. Privacy here isn't a toggle you flip — it's how the app is built.
No. Bloom gives you clear, personalized insight into your own cycle, but it doesn't diagnose conditions or replace your doctor. What it does is make your data easy to bring to an OB-GYN or fertility specialist who can.
Start tracking free today. Give it three cycles and Bloom will know your rhythm better than any calendar ever could.