Legal

Privacy Policy

Effective August 6, 2026 · Applies to the Lull iPhone app

1. Who is behind Lull

Lull is an independent iPhone app made by Brian Estrada. This policy explains exactly what happens to the information you put into the app. It is written plainly on purpose: period tracking involves sensitive health information, and you deserve to understand where yours goes without wading through legal boilerplate.

2. What data Lull handles

Lull handles only the information you choose to enter, plus the settings you choose in the app:

• Cycle logs: for each day, your flow level (spotting, light, medium or heavy) and your discharge observation.
• Symptoms and moods: the symptoms and moods you select from Lull's predefined lists.
• Notes: free-text notes you write on a day.
• Settings: your preferences, including your cycle status (such as pregnant, breastfeeding or on birth control), whether Apple Health sharing is enabled, and whether the daily reminder is on and at what time.

Predictions, averages, regularity and phase patterns are calculated from these entries on your device. They are not computed anywhere else, and no calculation requires an internet connection.

Lull does not ask for your name, email address, phone number, date of birth or location. There is no account to create and no profile to fill in.

3. Where your data lives

On your device. Your entries and settings are stored locally on your iPhone, in the app's own database, protected by iOS's built-in file protection and your device passcode.

In your own private iCloud. If you are signed in to iCloud and have iCloud enabled for Lull, your entries also sync through your personal iCloud account, using Apple's CloudKit private database. A private database is exactly what it sounds like: a container tied to your Apple Account that only your own devices can read. The developer of Lull has no access to it, cannot query it, and cannot see that it exists. Apple's handling of iCloud data is governed by Apple's Privacy Policy.

If you are not signed in to iCloud, or you turn iCloud off for Lull in iOS Settings, the app keeps working. Your data simply stays on that one device and does not sync.

Widgets. Lull's home-screen and lock-screen widgets read a small summary of your recent days from a shared storage area on your device so they can render without recalculating anything. That summary never leaves your iPhone.

4. What the developer collects

Nothing.

To be specific, Lull contains:

• No developer-operated servers or backend of any kind.
• No user accounts, logins or identifiers.
• No analytics, telemetry, crash reporting or usage measurement.
• No advertising and no advertising identifiers.
• No third-party SDKs, trackers, pixels or embedded web content.

Because there is no server and no analytics, there is no record anywhere of what you logged, when you opened the app, or whether you use it at all.

5. Apple Health

Apple Health integration is off by default and is entirely optional. Lull works fully without it.

If you turn it on

iOS asks you for permission first, and you decide which categories to allow. With your permission, Lull writes your logged data into Apple Health's Cycle Tracking and State of Mind: flow, spotting, discharge, symptoms, moods, and your cycle status (pregnant, breastfeeding or on birth control). A small number of symptoms Lull offers have no matching Apple Health type and stay inside Lull only.

Lull can also read a little from Apple Health to show you extra Insights cards: Apple's own computed cycle-deviation flags and Apple Watch wrist temperature. This data is displayed to you inside the app and nothing more. It is never copied elsewhere, never transmitted, and never leaves your device.

Apple Health data stays under Apple's protections and your control. You can review or revoke Lull's permissions at any time in the Health app, under Sharing, or in iOS Settings under Privacy & Security → Health.

If you turn it off

Switching Apple Health sharing off in Lull's settings removes the samples Lull wrote to Apple Health. Data written by other apps, or entered by you directly in the Health app, is untouched.

6. Notifications

Lull can send two kinds of reminder, both optional and both scheduled locally on your device by iOS:

• A daily log reminder at a time you choose, which quietly skips any day you have already logged.
• A one-off “Did your period start today?” prompt on the day Lull predicts your period will begin.

No notification is ever sent from a server. There is no push service involved, and nothing about your cycle travels over the network to produce one. Notification permission is requested only when you turn a reminder on, and you can revoke it in iOS Settings → Notifications at any time.

7. Deleting your data

You are always in control of your data. You can:

• Delete individual entries by clearing a day inside the app.
• Remove what Lull put in Apple Health by switching Apple Health sharing off in Lull's settings, which deletes the samples Lull wrote.
• Delete everything by deleting the app from your iPhone. To also remove the synced copy, delete Lull's iCloud data in iOS Settings → your name → iCloud → Manage Account Storage.

Because the developer never holds your data, there is no deletion request to send and no copy left behind on anyone else's system.

8. Sharing and selling

Your data is never sold, rented, licensed, brokered or shared with any third party: not with advertisers, not with data brokers, not with analytics providers, not for any purpose. This is not a policy that could quietly change with a business decision: the app has no mechanism to transmit your data anywhere.

The only exception is one you create yourself: if you enable Apple Health sharing, your data goes into Apple Health on your device, where other apps you have authorised may be able to read it under Apple's permission system.

9. Children

Lull is not directed at children under 13, and the developer does not knowingly collect personal information from children under 13, or from anyone else, since no information is collected at all. If a young person uses Lull, their entries stay on their own device and in their own iCloud account, exactly as described above. Parents and guardians who have questions are welcome to get in touch.

10. Changes to this policy

If this policy changes, the updated version will be posted on this page with a new effective date. Meaningful changes, particularly anything that would alter how your data is handled, will also be noted in the app's release notes. The current version always applies to the version of Lull you are using.

11. Contact

Questions about privacy, or about anything in this policy, are welcome:

• Email: hello@brianestrada.com