A period app that stays yours.
It takes about ten seconds a day. Three quick sliders, tap what you felt, and you are done. There is nothing to learn, nothing to get wrong, and no confusing health jargon.
Cycle0 handles the maths in the background: how long your cycles run, when to expect the next one, and what symptoms keep coming back. Best of all, there are no accounts, no sign-ups and no passwords to remember. Everything you write stays strictly on your device — where it belongs.
Nobody reads it but you
There is no account and no sign-up, so there is nothing about you for anyone to find. What you write down stays on your device. If you want a safety copy it goes to your own iCloud or Google Drive — never to us, because there is no us to send it to.
One price, once
Pay $4.99 once, and never pay again. No monthly fees, no subscriptions, and no features quietly locked behind a paywall. You get the full app from day one — including every report and advanced tracking tool.
No spam. No unwanted advice.
Cycle0 only speaks up when you ask it to. You can set quiet, local reminders for your likely start dates or daily logging — and that is it. It will never flood your phone with random wellness tips, try to diagnose you, or push unwanted medical advice.
Four simple tabs. Everything right where you need it.
Cycle0 opens on Today, every time. Move a slider or two, tap a chip if something is worth noting, and you are done — no screens to work through, nothing to confirm. The other three tabs are there for when you feel like looking back.
Easy for every day. Thorough when you need it.
Most months, you just want to log a quick entry and move on. But if an appointment is coming up and you are tired of trying to remember every detail, deeper tracking tools are ready to turn on — exact pain spots, and what it stopped you from doing that day. When you are sitting with a health professional, you can hand over a clear, printed summary instead of relying on memory.
| Standard tracking On from the first launch | Advanced capturing Five advanced tools — completely optional, off by default. | |
|---|---|---|
| Every day | Bleeding, mood and wellbeing sliders | The same three sliders, plus one card below them |
| Symptoms | Chips you can hide, reorder or write yourself | Unchanged — your chips stay your chips |
| Pain | A chip, if you added one | 6-step scale based on daily impact, location, and pain quality |
| Where it hurt | — | Location chips with a visual body map |
| Also records | — | Bowel, bladder, how the day went, medication taken |
| Time to log a day | About ten seconds | Under a minute |
| In the report | Cycle averages, daily entries, and notes | Adds dedicated pain pages and a visual recurring map |
Descriptive words, not arbitrary numbers.
When asked about pain, "a 7 out of 10" tells very little. Cycle0 anchors its pain scale to real-life impact—like “Stopped me working”—so you can share clear, meaningful context with whoever is caring for you. It never asks you to name a condition; each tool simply notes down what happened, nothing more.
Questions about the deeper tools →Something you can put on the desk
Ten minutes with a doctor goes differently when you are not reconstructing eight months from memory. Cycle0 lays out your diary as a clear PDF handout — complete with cycle averages, daily logs, notes, and symptom mapping.
- · Designed for quick reading: Summarises cycle lengths, bleeding days, and symptom patterns right at the top, so a healthcare provider gets the big picture in seconds.
- · 100% private, generated on-device: Your PDF is created entirely on your phone. No servers, no uploads — it stays a local file until you choose to print or share it.
- · Complete daily history: Includes your exact daily entries, notes, and optional pain-location maps, so you have a factual record ready for your appointment.
An app that grows with you.
Your body does not stay the same forever, and the app should not pretend to either. Cycle0 adapts as your life changes — no matter your age.
Starting out
Irregular cycles are completely normal at first. Cycle0 never forces a fake prediction date just to look smart.
Settled
Once your body finds a rhythm, Cycle0 can give you a calm, expected date for your next period.
Changing pace
If your cycle starts drifting, the app stays quiet and simply counts the days rather than guessing.
Menopause
Transition whenever you are ready — one tap switches the app to count months instead of cycles.
After
Clean, clear support without scary colours or alarmist warnings.
Three ways out, all of them yours
Nothing leaves your device unless you send it yourself.
No middleman ever touches your data on the way.
To storage you already own
An encrypted backup file, to your own cloud or your own disk. It is the only thing that can be brought back in.
PDF or CSV
A report is something to read. It goes out, it does not come back.
Everything else
Delete everything, from inside the app, without asking anyone.
Why you won’t find a free trial here
A trial needs to know who you are and when your trial ends. That means an account and a server — the two things this app exists to avoid. One purchase keeps the arrangement simple.
Instead, it is $4.99 once, up front. No subscriptions, no surprise charges, and no hidden features. You get to see every real screen on this website before you buy, and if it ends up not being the right fit, standard store refund policies have your back.
One purchase, for as long as you have cycles
Around $4.99 on your store. Prices differ by country and the store shows yours before you buy.
Prices in local currency may vary with store rounding and VAT.