A private period tracker: your cycle data never leaves your phone
Your cycle is personal. With Soul Tranquility, everything you log is stored only on your device. We can’t see it, sell it or share it, and the free version doesn’t even need an email.
Start freeWhy privacy matters for period tracking
Period and fertility data is some of the most personal information you can put into an app. Many apps store it on their servers or share data with advertisers and analytics companies. Soul Tranquility was built the other way around: the app works without sending your entries anywhere.
What you can track
- Periods, cycle length and predictions
- Fertility signs
- Symptoms, mood and energy
- PMS and PMDD patterns (Premium)
- A private journal with patterns and trends (Premium)
What stays private
- No account needed for the free version
- No ads, trackers or behavioral analytics
- Export or erase everything yourself, anytime
- Premium members share only an email, for payment and sign-in. It’s never linked to what you log.
Read the full privacy policy.
Questions
Where is my data stored?
On your phone, in the app’s local storage. It isn’t uploaded to our servers. You can download a backup file to move it to a new phone.
Do I need an account?
Not for the free version. Premium needs an email and password so we can confirm your membership.
Does it track perimenopause too?
Yes. Turn on Perimenopause Mode for stage-based daily guidance when your cycle starts changing.