Twilune Get Twilune free

Period tracker · mood forecast · calm tools

Finally, a period app that gets your moods.

Twilune predicts your period, shows how today might feel in your phase, and helps you calm down in two minutes when it all gets too much.

Get Twilune free See how it works
  • No account
  • Logs stay on your phone
  • No ads, ever
  • Core features free for good
Twilune's Today screen: cycle day 22, about 7 days until the next period shown as a range, luteal phase, and a forecast card that reads Nesting instincts

How it works

Three things, done properly.

Twilune's calendar with logged period days and the predicted next period shown as a range
Predictions that stay honestYour next period and phases, learned from your own history and shown as a range with a confidence level. Late? It says so instead of quietly moving the date.
Twilune's patterns screen showing which moods and symptoms tend to appear in each phase
Your moods, explainedA daily forecast of energy, mood and focus for your phase, and after a couple of cycles, your own patterns: which feelings tend to show up when.
Twilune's Breathe screen guiding a physiological sigh, with box breathing, 4-7-8 and a cramp-ease belly breath to choose from
Calm in two minutesGuided breathing, 5-4-3-2-1 grounding, a mood check-in and an SOS screen that keeps crisis lines in reach for the hardest moments.

Your inner seasons

You're not "too much". You're cyclical.

Twilune gives each phase a season, so a rough day makes sense instead of feeling like it's you.

Inner winterRest, warmth, fewer plansMenstrual phase
Inner springFresh energy, new ideasFollicular phase
Inner summerSocial, bold, outgoingAround ovulation
Inner autumnNesting, boundaries, softnessLuteal phase

These are common patterns, not rules. Your own logs show what your seasons are really like. Which season are you in today?

Also inside

Gentle company, never pressure.

Lumi grows with you

A small companion that grows as you look after yourself. Miss a day? Lumi never wilts. No guilt, ever.

Ask Siderelle

A calm guide who knows where you are in your cycle. Ask why you feel the way you do, or talk through a hard day. General wellbeing information, not medical advice.

Share only what you choose

Send a partner a private link with just the details you pick, plus phase-by-phase tips for supporting you. Or make a story card of your season.

Private by design

Your cycle is nobody's business model.

Period apps have faced regulators over sharing health data. Twilune was built so it can't: there is no account and no server holding your logs. What to check in any period app.

  • No account, no email, no phone number
  • Cycle, moods and journal stored only on your phone
  • No ads and no tracking SDKs; usage counts only if you say yes
  • PIN lock for shared phones
  • Export a backup, or delete everything in two taps

Fair pricing

Free where it matters.

Free

€0
  • Period and phase predictions, with honest ranges
  • Calendar, symptom and mood logging
  • Daily forecast for your inner season
  • SOS, breathing, grounding and core calm tools
  • Lumi, story cards and the partner link

Premium

€39.99 a year
  • Your personal patterns by phase
  • Unlimited chats with Siderelle
  • The full calm-skills library and every journal prompt
  • Partner mood sharing
  • 7-day trial with no card and no automatic charge

Also €6.99 a month or €89.99 once. What Premium adds

From the blog

Understand your cycle, kindly.

Cycle and phases

Why period predictions are ranges, not datesCycle length varies from month to month, even in regular cycles. Why period predictions work best as a range, and when irregular periods need a doctor.

PMS and moods

PMS or PMDD? How to tell the differencePMS and PMDD share symptoms, but PMDD is more severe and disrupts daily life. Learn the signs, how it is assessed, and what to bring to a doctor.

PMS and moods

PMS mood swings: what actually helpsWhat can help PMS irritability, low mood and anxiety: exercise, sleep, CBT-style skills, tracking, and when to talk to a doctor. Evidence sorted by strength.

All articles

FAQ

Questions, answered.

What is Twilune?

Twilune is a private period tracker and mood app. It predicts your period and cycle phases from your own history, shows how today might feel in your phase, and has calm tools for the hard days. There is no account, and your logs stay on your phone.

Is Twilune free?

Yes. Tracking, predictions, the calendar, the daily forecast, SOS and the core calm tools are free for good, with no ads. Premium is optional and adds pattern insights, unlimited chats with Siderelle, the full calm-skills library and more.

Where is my data stored?

Only on your phone, in the app's private storage. On Android 9 and newer it can also ride along in your phone's own end-to-end encrypted Google backup, if you have that switched on, so a reinstall brings it back. We never see it. You can export a backup file or delete everything at any time from the Me tab.

Does Twilune sell or share my data?

No. There are no ads and no advertising or tracking SDKs, and we never receive your logs, so there is nothing to sell. If you say yes, the app sends pseudonymous usage counts (which screens and tools get used, never what or when you log) to PostHog in the EU. It is off unless you turn it on. Details are in the privacy policy.

Can I use Twilune as contraception?

No. Predictions are estimates for planning and understanding your body. Twilune is not a medical device or a birth-control method and never shows "safe days".

What happens when the free trial ends?

Nothing is charged. The 7-day trial needs no card. When it ends, Premium features lock again and you can choose a plan if you want one. Your data and the free features stay exactly as they were.

More questions

Meet your inner seasons.

Predictions you can trust, a forecast for how today might feel, and calm in two minutes. Free, with no account.

Get Twilune free