Things people ask

Yes. Set a PIN, then add Face ID, Touch ID or a fingerprint where your device supports it, with the PIN as the backup. You can also set a second decoy PIN that opens an empty Splash, and a panic wipe that clears the phone. Encryption does not stop someone holding your unlocked phone, so a lock helps.

No. Without an account, everything stays on your phone and nothing about your cycle reaches us. With an account, your phone encrypts your data (AES-GCM-256) before it syncs, and we only store a locked copy we have no key for. We cannot read your logs, so we cannot show them to anyone else.

No. This website sets no cookies, uses no local storage, and loads no analytics or third-party scripts or fonts. The calculators run in your browser, so what you type into them is never sent anywhere, and you can read everything here without agreeing to anything.

We can only hand over what we hold: your email and sign-up date, locked copies we cannot decrypt, unsent notification text, and timing information. Without an account, we hold nothing about you. Your phone itself is a separate matter, so see our safety page for the decoy PIN, panic wipe and free support lines.

No. There are no analytics SDKs and no trackers in Splash, and we do not sell data. We could not sell your logs anyway, because we cannot read them. The only outside services involved are hosting, encrypted backup storage and push delivery, and none of them receives your cycle data in readable form.

Your logs sit on your phone. If you turn on backup, sync or partner sharing, your phone first encrypts them with AES-GCM-256, using a key made on your device that never reaches our server. We store only the locked copy. A partner share uses a separate key that exists only in your QR code and your app.

Any health data can matter if it reaches the wrong hands, which is why apps differ so much. Data on your phone is only as private as your phone. Without a Splash account we hold nothing about your cycle, and with one we hold ciphertext. If you are worried, use the lock, decoy PIN and discreet mode.

Encryption does not stop someone holding your unlocked phone. Splash has a PIN lock, a decoy PIN that opens an empty app, a panic wipe on the lock screen, and discreet mode. Our safety page has more help and free support lines, including Refuge on 0808 2000 247 in the UK.

The app is served by Vercel, and accounts and encrypted backups are stored with Supabase in Paris, France (EU). Two optional extras reach other companies without any health data: some rarer emoji pictures load from Google’s Noto emoji service, and the optional natural read-aloud voice downloads a model from Hugging Face once.

Only if you make an account: your email, when you sync and how big the locked copy is, which categories a partner share includes (not the data), push notification addresses, and the text and time of notifications waiting to be sent. Notification text is neutral by default, and without an account the server sees none of this.

On your phone, inside the app or browser storage. If you create an account and turn on sync, an encrypted copy is also stored with Supabase in Paris, France (EU), and the app itself is served by Vercel. Browsers can occasionally clear website data, so save a backup file or turn on encrypted sync.

Without an account, delete the app or clear its data. With an account, go to Settings, then Account & sync, then Delete account. That removes your account and every row we hold about you. You can also wipe the phone with the panic wipe, and you can export a backup file first if you want to keep a copy.

If you still have a signed-in device, you can link a new one from it. If you have lost the code and every device, we cannot recover the backup, because we never had the key. That is the trade-off of end-to-end encryption, so keep your recovery code somewhere safe and save a backup file now and then.

No. Splash works fully without one: you open it, start logging, and nothing about your cycle reaches us. An account is optional and only adds encrypted backup and sync between devices, partner sharing and push notifications. You can use the doctor report, insights, the library and every mode without ever signing up.

Encrypted backup and sync across your phones, so a lost phone does not mean lost history, plus partner sharing, clinician links and push reminders. Everything you log is encrypted on your phone before it uploads. You get a recovery code shown once, and you can link another phone with a QR code.

It does not, today. Splash is a small independent project from WhealBit in St Ives, Cornwall, and it runs on low-cost hosting because your data lives on your phone and backups are small encrypted files. If that ever changes, we will not do it by selling data, and we will say so on the changelog first.

Yes. There is no subscription, no paid tier and no in-app purchases. Partner sharing, the doctor report, insights, every mode and the full health library are included. Some other apps keep similar features in a paid tier, such as Flo Premium or Clue Plus, and our comparison pages show which, with sources and dates.

Everything in Splash is free to use right now. If pricing ever changes, we will say so clearly in advance, and you can always export a full backup of your data. We make no promise about the future that we are not sure we can keep, so we only describe what is true today.

No. Splash is not contraception and not a medical device, and that includes its ovulation estimates, even when one says Confirmed. Fertile-window estimates are for understanding your cycle, not for avoiding pregnancy. If you are avoiding pregnancy, use a method that is designed for that, and ask a pharmacist, GP or sexual health clinic.

No. Splash cannot diagnose anything. It can help you spot patterns worth mentioning to your doctor, and the doctor report puts them in one place for an appointment. Conditions such as PCOS, which the NHS now also calls PMOS, are diagnosed by a clinician using your symptoms, blood tests and sometimes a scan.

They are estimates, and they get better as you log more cycles. In our own tests on made-up cycle histories, the real start fell inside the range Splash showed 82% of the time for regular cycles and 75% for irregular ones. Real cycles are messier, and stress, illness and travel can all shift a period.

Yes. Splash uses your own history rather than assuming 28 days, and widens its estimate when your cycles vary. In perimenopause or PCOS modes it starts wider and does not nag you about a late period. The NHS calls periods irregular when the gap is under 21 or over 35 days, and suggests seeing a GP.

They say how sure Splash is. Estimated comes from your cycle history alone. Likely means an LH surge or a mucus peak points to a day. Confirmed means a later sign agrees, such as a temperature shift above your coverline, positive PdG tests or a wrist-temperature rise. Tap the label to see how it was worked out. All of them are estimates.

LH tests (including High readings and numbers from readers), cervical mucus, basal body temperature, PdG tests, and Apple Watch or wearable temperature through Apple Health or Health Connect. Splash draws your coverline and puts them all on a fertility chart, with a note on how each estimate was worked out.

Because cycles vary. A large 2019 study of 612,613 cycles found a mean length of 29.3 days, and only a minority of cycles were exactly 28 days. A window with a most-likely day is more honest than a single date, and it narrows as you log steady cycles.

No. Your partner opens Splash, chooses “I’m a partner”, and scans your code. You need an account to share, because the locked snapshot is stored on our server. If you ever want to stop, you end the share from your own phone, and their access ends at once.

Yes. Some apps charge for it: Clue keeps sharing your own cycle in Clue Plus, while basic Flo for Partners is free. In Splash, sharing is free, end-to-end encrypted, and lets you choose exactly which categories your partner sees, with a pause button and optional expiry.

You show your partner a QR code. It carries a key that only exists in that code and in your app. Their phone uses it to unlock a snapshot of what you chose to share. Our server only stores the locked snapshot, so we cannot read what you share.

Yes, any time. Stop sharing and their app says sharing has ended. Or pause it: they keep seeing your last update, frozen, and nothing tells them it is paused. You can also set a share to expire on a date you pick, and replies to today’s vibe are deleted after three days.

Only the categories you tick: cycle and period, fertile days, mood, symptoms, that love was logged, notes, pregnancy week and today’s vibe. Never your PIN, photos or anything you leave off. Their view is read-only, and you can preview exactly what they will see before you invite them.

Yes. Open it in Chrome and add it to your home screen, or install the Android app from Google Play. Android gets a “Your cycle” widget, a “Quick log” widget, long-press shortcuts on the app icon, and Health Connect for temperature from apps such as Samsung Health, Fitbit and Oura, if you allow it.

Native apps for iPhone, Apple Watch and Android are on their way to the App Store and on Google Play now. The web app works today in any browser: open it, add it to your home screen, and it opens full-screen and works offline. It is the same Splash either way, and you can move between them with a backup or encrypted sync.

Yes, with the iPhone app. See your cycle ring, start or end a period, log flow with the Digital Crown, log symptoms and mood, scrub through upcoming days and breathe with Splash. Complications put your cycle day and next period on your watch face.

Yes, if you allow it. On iPhone, Splash can read cycle data and Apple Watch wrist temperature from Apple Health. On Android, Health Connect brings in skin temperature from apps such as Samsung Health, Fitbit and Oura. You choose what it can read, and you can turn it off in your phone’s settings.

Open Splash in Safari, tap Share, then Add to Home Screen. Open it from the home screen icon from then on, so your iPhone keeps its data safe. You can bring your history across to the app later with a backup file or encrypted sync.

On iPhone, Splash can show three timers on your Lock Screen and Dynamic Island: pain relief, the mini-pill window, and contraction timing in pregnancy. You choose which ones to show with a toggle. They use neutral words such as “Next dose” and “Timer”, never show medicine names, and get blander still if you use discreet mode or a PIN.

Yes, once Splash is added to your home screen (iOS 16.4 or later) and you have turned on notifications with an account. Reminder text is neutral by default, so a lock-screen glance does not reveal your cycle, and the only thing our push server ever sees is that neutral text and its timing.

Yes. Everything you log is saved on your phone, so Splash works with no signal, on a plane or in a basement. If you use an account, sync catches up when you are back online. The calculators on this website also work once the page has loaded, because they run in your browser.

Yes. On iPhone there are Home Screen and Lock Screen widgets. On Android there is a “Your cycle” widget and a “Quick log” widget, plus long-press shortcuts on the app icon. If you use discreet mode or a PIN, widgets use neutral wording so a glance at your screen reveals nothing.

Yes, if you have an account. Choose the sections and how long the link lasts (24 hours, 7 days or 30 days), then show the QR code or send the link. The report is end-to-end encrypted with a key held only in the link, you can see how many times it was opened, and you can revoke it whenever you like.

Discreet mode swaps sensitive words such as “period” for sea emoji on screen, keeps notifications and widgets neutral, and skips daily tips that would need masking. It is for moments when someone might glance at your screen. It sits alongside the PIN, a decoy PIN and the panic wipe. It is not a substitute for a lock.

A summary built on your phone from your logs: cycle lengths, period days and flow, symptoms, moods and notes, over the months you pick, plus questions to ask. Print it, save it as a PDF or show it on screen. It is free in Splash; Flo keeps its version in Premium. It cannot diagnose, but it makes appointments easier.

Yes. Splash can import exports from Flo, Clue, Apple Health, drip, Natural Cycles, Oura, Fitbit, Garmin, Bearable and the GP Apps Period Tracker, plus any spreadsheet, a Splash backup, or a few dates you type in. Your file is read on your phone and not uploaded. Stardust has no export, so type your last few periods instead.

177 short articles on periods, cycles, fertility, contraception, pregnancy, conditions, mind and mood, and perimenopause, free to read in the app and on this website. Each one opens with a quick answer, lists its sources (NHS, NICE, FSRH, RCOG, ACOG, WHO and peer-reviewed research) and shows when they were checked.

Yes. It widens predictions for changing cycles, does not nag you about “late” periods, and lets you log hot flushes, sleep, mood and HRT, then gather months of symptoms into the doctor report for your GP. It cannot tell you whether you are in perimenopause. A GP can usually do that from your symptoms if you are over 45.

Yes. It combines LH tests, cervical mucus, basal body temperature and wearable data into a fertility chart, shows best days to try and a test-date countdown, and prompts a GP visit in line with NICE guidance. All of it is an estimate. Splash is for understanding your cycle, not a fertility treatment or a diagnosis.

You can leave pregnancy mode gently at any time. Splash removes week-by-week content, keeps the mascot out of those screens and offers support reads. Your logs and history stay yours, and you can export a backup or delete everything whenever you want.

Call your maternity unit straight away, day or night, and do not wait until tomorrow. In Splash, “Baby moving less?” sits at the top of pregnancy mode: save your unit’s number for one-tap calling, with NHS 111, 999 and the signs that mean you should call. Splash is information, not medical advice.

No. It follows the usual schedule in England, with extra checks if it is your first baby, so you know what is coming: booking, the 12- and 20-week scans, whooping cough, RSV and flu jabs, Healthy Start and MATB1. Your midwife’s plan for you always comes first, and Splash is not affiliated with the NHS.

Your due date from your last period, a scan date or an IVF or IUI transfer. Then week by week with sea-creature sizes and a tip for your partner, an NHS journey checklist, a kick counter, a contraction timer, appointments, a hospital bag list, a maternity leave helper and postpartum notes. It is free, and it is information, not medical advice.

No. Splash works fully without an account, so a young person can log their first periods without giving us an email address, a name or a date of birth. Nothing about their cycle reaches us unless they choose to make an account later.

Splash has a teen setting for ages 13 to 17 with simpler words and teen cycle ranges, where 21 to 45 days is normal while your body settles in. It needs no account or email, has no in-app purchases, and hides sex, love and fertility tracking by default. It is not contraception or medical advice.

Two ways: turn on an account for encrypted sync, or save a backup file from Settings. Browsers can sometimes clear website data, so it is worth doing one of them. A backup file restores everything, photos included, and it also lets you move to a new phone without an account.

Sign in on the new phone, then scan the “link device” code your old phone shows. Or enter your recovery code. Without an account, save a backup file and open it on the new phone. Both routes restore your history, and the encrypted copy is unlocked on your device, never on our server.

No. Splash is general information and a tracking tool. If you are worried about your health, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 in the UK or 911 in the US. Splash is not a medical device and cannot diagnose.

No, and we will not pretend otherwise. The Splash team writes it from NHS, NICE, FSRH, RCOG, ACOG, WHO and peer-reviewed sources, a person checks every fact against its source, and each article lists its sources and the date they were checked. We would like a clinician to review it in future.

No. Splash is made by WhealBit, an independent company in St Ives, Cornwall. We cite NHS guidance in our articles and some features follow the NHS schedule, such as the pregnancy checklist, but we are not part of the NHS and it does not endorse or review our content.

Please email us at corrections@splash.care with the page and what is wrong. We check it against the sources, fix it, and note significant corrections on the page. Comparison pages carry a “last reviewed” date, and we update them when another app changes its pricing or features.

Splash is made by the Splash team at WhealBit, a small independent company in St Ives, Cornwall, UK. It started as a gift for one person who was fed up with subscriptions in other period apps. You can reach the team at hello@splash.care, and corrections to any page are welcome.