About Twilune
Twilune is a small, independent app made in Portugal. It exists because period tracking and mood should live in one place, and because your cycle data should stay yours.
Why we made it
Most period apps are good at dates and quiet about feelings. Mood apps rarely know where you are in your cycle. People told us they wanted one place that explains why the week before a period can feel so different, and helps in the moment. That is Twilune: predictions, a forecast for how today might feel, and calm tools.
We also wanted an app you don't have to trust with your data, because it never has it. There's no account and no server holding your logs (an optional live partner link keeps only an encrypted copy we can't read). The details are in the privacy policy, written to be read.
How Twilune is funded
By Premium, and only by Premium. No ads, no data deals, no investors asking for growth at any cost. The core of the app is free for good.
How we write the blog
- Every factual or health claim links to its source at the end of the article: health services such as the NHS and the US Office on Women's Health, clinical references such as Cleveland Clinic, and peer-reviewed research.
- We check that each source says what we say, and we say "around" or leave a number out when the evidence is uncertain.
- We write general information, never a diagnosis, and we say when to see a doctor.
- We never write about "safe days" or using a tracker to prevent pregnancy. Twilune is not contraception.
- When we update an article, the new date shows at the top.
- Articles are written and fact-checked by the Twilune team against those sources. They are not yet reviewed by a clinician; when one is, the article will say who.
Spotted a mistake? Email jfpvcorreia@gmail.com and we'll fix it.
Not a medical device
Twilune is a self-care app. It does not diagnose, treat or prevent any condition. If your periods are very painful or heavy, stop, or your moods make life hard, please talk to a doctor.
Contact
jfpvcorreia@gmail.com. We read everything, and testers' notes shape what comes next.