Cycle tracker for iPhone and Android
Stay one step ahead of your cycle
Know when to expect your period, understand how you feel and find ways to look after yourself in every phase.
iPhone (iOS 17 or later) and Android (8.0 or later)
- Data stays on your phone
- No account
- Free
What Ellu is
A calm companion for every day of your cycle
Log how you feel, see which phase you’re in and what comes next, keep notes for your doctor close at hand. All in one simple app that doesn’t send your data to a server.
My cycle
Cycle day, current phase and period forecast on one screen.
What’s ahead
Which phase starts next, and in how many days.
Your whole history
Past periods and the forecast in one calendar. Any entry can be changed.
Head aching since morning
Belly cramps and pulling
Lower back sore all day
Mood everything’s too much
Sound familiar?
These days can be hard
Especially when they start out of the blue: in the middle of a meeting, on the road, with no painkillers or pads in your bag.
Keep scrolling ↓
With Ellu you’re ready ahead
You roughly know when to expect your period and get tips for every phase: stock up on pads, take the first days easy, choose what helps you feel more comfortable. Plan your week around yourself and meet these days calmer.
- Reminder two days before
- Tips for your phase
- Supplies at hand
Four phases
Every phase has its own weather
Hormones change all month, and your energy, mood and appetite may change with them. It’s different for everyone. Ellu explains what’s going on and how to support yourself.
days 1–5
Period
Sometimes you want more rest, warmth and care.
days 6–12
Follicular
Energy may build up. Notice what comes easier for you.
days 13–16
Ovulation
You may have more energy, or notice no change. Both are normal.
days 17–28
Luteal
Energy may dip. Leave time for yourself and don’t ask too much of yourself.
Every day with Ellu
More than a period calendar
Calmer. More confident. One step ahead.
- 01 / 04
See what’s ahead
Not just the phase you’re in, but which one starts next and in how many days. Open it to see what’s coming.
- 02 / 04
Tips for every phase
What helps right now and how to prepare: short tips for your phase, from exercise to food.
- 03 / 04
A wellbeing diary
Energy, mood, pain and symptoms in a couple of taps, not only on period days. Ellu reminds you to log the day and shows how it went last time.
- 04 / 04
Notes with reminders
Questions for your gynecologist, an ultrasound appointment, pads or a hot-water bottle to buy: write it down and set a reminder so you won’t forget.
- 01
See what’s ahead
Not just the phase you’re in, but which one starts next and in how many days. Open it to see what’s coming.
- 02
Tips for every phase
What helps right now and how to prepare: short tips for your phase, from exercise to food.
- 03
A wellbeing diary
Energy, mood, pain and symptoms in a couple of taps, not only on period days. Ellu reminds you to log the day and shows how it went last time.
- 04
Notes with reminders
Questions for your gynecologist, an ultrasound appointment, pads or a hot-water bottle to buy: write it down and set a reminder so you won’t forget.
Where you are
Your whole cycle at a glance
Ellu highlights the phase you’re in and shows how many days until the next one. Tap any of them.
Days shown for a sample 28-day cycle. Ellu counts from your own dates.
Yours alone
Your cycle is personal. Ellu keeps everything on your phone and doesn’t send your data to any server: we don’t receive, store, share or sell it.
No account, no ads, no cloud. Lock the app with Face ID or your fingerprint. To move to a new phone, save a backup file in Settings and restore it there.
- On your phone
- No account
- No ads
- Face ID
Setup made for you
Ellu asks only what fits you
Age comes first, and each answer changes the next question. Try it: these are the app’s real options.
How old are you?
years old
What do you want from Ellu?
Questions
Questions, answered
Questions, bugs or a data deletion request: write to us and we’ll answer by email.
Email ussales@99francs.agency
Do I need an account?
No. Open the app and start. Your data stays on your phone; to move to a new phone, save a backup file in Settings and restore it there.
Can Ellu prevent pregnancy?
No. Ellu is not a method of contraception. Fertile days are a calendar estimate, for information only.
Is Ellu a medical device?
No. It’s a diary with approximate forecasts. It doesn’t diagnose anything. See a doctor if something worries you.
My cycle is irregular. Will it work?
Yes, with a wider range. Ellu shows how far your cycle varies instead of a single confident date, and you can turn forecasts off and only keep a log.
Can I take my data with me?
Yes. In Settings you can save a backup file, export everything to CSV or delete it all.
Ellu is coming to the App Store and Google Play
iPhone (iOS 17 or later) and Android (8.0 or later). Eight languages.