Today
rhythm
Estimates appear after you record a period start.
At a glance
Today’s check-in
Flow, symptoms, mood, energy, pain, and notes all belong here.
Pattern peek
Log a few days to see recurring symptoms and cycle ranges.
Cycle record
all privately stored on device! <3
They can help you prepare for a conversation with a clinician, but they cannot explain why a symptom happens.
Cycle history
Record at least two period starts to see cycle length.
Symptom patterns
Your most frequent symptoms will appear after you log them.
Recent record
No entries yet. Your latest check-ins will appear here.
Appearance
The theme applies to the whole app and is saved in this browser with your other preferences. It changes colour — never what is recorded or calculated.
Changes apply straight away. “Match system” follows your device’s light or dark setting.
Estimates
These defaults help when there is not enough history yet. Recorded cycles take over as your history grows.
Backup
There is no account or sync. Export a private backup before clearing this browser or changing devices.
Backup files contain sensitive health information. Store them somewhere you trust.
Privacy
No accountNo sign-in or profile is created.
No analyticsThe app does not load trackers, ads, or third-party fonts.
Browser storageEntries stay in this browser on this device. Anyone using this browser profile may be able to see them.
Assistant access is optionalBrowser assistant tools stay off unless you enable them. Using one may share the requested entry or summary with that assistant.
Data recovery
The saved tracker data could not be read, so new saves are paused to protect it. Download the original data before resetting this browser.
Reset
This removes every entry and preference from this browser. It cannot be undone unless you exported a backup.
About
period. is supposed to give you a calm, private place to record what your body is doing over time.
Made as a gift to my girlfriend, Shreya. Small daily details can be easy to forget and hard to explain later. Writing them down can help you spot what repeats, prepare for a conversation with a clinician, and while this can't alleviate how you feel, it can help you anticipate some of it.
Big Tech wants to own every record pertaining to you so they could better profile you. There is no account, tracking, or data being sold here. Your entries stay in this browser because your health information belongs with you. The entire code is open-source so anyone can fork or investigate it.
You can view the source code here: GitHub