Effective date: 2026-09-26 Last updated: 2026-09-26
Red Letter is a period tracker that keeps your log on your phone. We do not create accounts, do not ask for your email, and do not ship any analytics or tracking SDK. Your period dates, flow, symptoms and notes are health information. Red Letter stores them only on your phone and never sends them anywhere — not to us, not to Google, not to anyone. A backup or CSV file you save yourself is not encrypted, so keep it somewhere private.
The app contains no code that can reach a server at all, apart from the advertising SDK described below, which receives nothing from your log.
If that’s all you wanted to know, you’re done. The sections below spell it out in detail.
com.dashfusion.listperiod)The following data is created and kept locally, in the app’s private storage. It never leaves the device unless you save a backup or a CSV yourself.
Your cycle lengths, the estimate of your next period and every statistic are worked out from your log at the moment you look at them; nothing derived is stored.
About this information. Everything above is health information about you. You type it in yourself. Red Letter keeps it only in its private database on your phone and never transmits it.
The app explicitly opts out of Android cloud backup and device-to-device transfer, so Android never copies your log to Google Drive or to another phone without you choosing it. That has a cost worth knowing: a new phone starts with an empty log unless you restore a backup you saved. The app says so in Settings.
You can delete any period, change or remove what you logged on any day, use Settings → Delete everything, or uninstall the app — Android removes the local database with it. A backup or CSV file you saved elsewhere is yours, and is not touched by either.
We have no servers and no cloud storage. We cannot see your log and we cannot recover it if you lose your device.
Save a backup and Save as a CSV file write a file where you choose, through Android’s own file picker. These files are not encrypted: anyone who can open the file can read the health information in it, so keep it somewhere private. Restore a backup reads a file you choose, the same way; the app keeps no access to it afterwards.
The app contains the Google Mobile Ads SDK. It shows an occasional full-screen interstitial ad — only as you leave the History screen, never while you log — plus an optional rewarded ad you can choose to watch to remove ads for 24 hours. There are no banner ads. Ads are limited to content rated for teens. Google may collect and process:
AdMob receives nothing from your log: no dates, no flow, no symptoms, no notes and no keywords. Like any ad in any app, an ad request does name the app it comes from. Google’s handling of the data above is governed by Google’s own policies:
Consent (EEA, UK and Switzerland): on first launch the app shows Google’s certified consent form, and you choose whether personalised ads are allowed. You can change your answer at any time from Settings → Advert privacy options inside the app. You can also opt out of personalised advertising via your device’s system settings (Android: Settings → Privacy → Ads).
Some laws — for example Washington’s My Health My Data Act — give you rights over health data that a business collects about you. Dash Fusion collects no consumer health data. Your period dates, flow, symptoms and notes never leave your phone through the app, so we never receive, share or sell them, and there is nothing of yours on any server of ours to access, correct or delete.
None. We don’t run any backend. We have no analytics SDK, no crash reporter that phones home, no Firebase, and no custom telemetry. There is no HTTP client anywhere in the app’s own code, and the build fails if one is ever added.
AD_ID) — required by Google Play for apps that serve ads;
used by AdMob as described above.RECEIVE_BOOT_COMPLETED) — only so reminders you switched
on are set again after your phone restarts.USE_BIOMETRIC) — only for the optional lock. It reads nothing:
Android checks your fingerprint or screen lock and tells the app yes or no.Red Letter has no access to your location, contacts, messages, calendar, camera, microphone, photos, files or health-platform data, and it asks for none of them. A test reads the built app’s own merged manifest on every run and fails the build if that list ever changes.
Red Letter is not directed to children under 13. We do not knowingly collect data from children — and, as above, we collect no personal data from anyone.
Red Letter is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Consult a healthcare professional for medical advice, diagnosis, or treatment.
If we change the data we collect or the third-party services we integrate, we will update this page and bump the “Last updated” date above. Material changes will be flagged in the app’s release notes as well.
Questions, requests, complaints: dash.fusion@outlook.com.