Privacy Policy
Grumble is a walking companion app. You walk, and a small monster grows. This policy explains what the app does with your information.
The short version. Almost everything Grumble knows about you stays on your phone. There are no accounts, no analytics, and no advertising, and we do not collect profile, health, activity, or journal data on any server of ours. The only information that leaves your device is what's needed to process a purchase — which does mean Apple and our purchase-validation provider see technical details such as your IP address. Section 4 spells that out.
1. Health data
With your permission, Grumble reads two things from Apple Health:
- Step count — as a daily total, and grouped by hour
- Walking + running distance
That is the complete list. Grumble does not request heart rate, workouts, sleep, location, or any other health category. Access is read-only — the app never writes anything back to Apple Health.
Grumble may read your step count grouped by hour, so it can show you the times of day you usually walk. This is the same Steps permission and the same step data — no additional health category is requested — simply read at a finer granularity. Those hourly totals are used and stored on your device like everything else in this section, and are never transmitted.
Your health data is never transmitted anywhere. It is read on your device, used on your device to grow your monster and track your goal, and stored on your device. It is never sent to us, to any server, or to any third party. It is never used for advertising or marketing, and it is never sold.
You can refuse Health access, or revoke it later in the iOS Settings app under Privacy & Security → Health → Grumble. The app still works without it; you can log activity manually instead.
2. Information you enter
Grumble stores the following on your device, only if you choose to provide it:
- A display name — used only to greet you on the home screen. Cosmetic.
- Body weight — used only to estimate calories burned. Every estimate scales from this number. Stored locally, never sent anywhere.
- Activities you log — the type and duration of things like a walk or a run.
3. Information the app generates
- An anonymous device identifier, created on first launch. It is a random string generated on your phone. It is not your Apple ID, not your device's hardware identifier, and it is not linked to your name, email, or any account. The app shows it to you under Settings → About as your Support ID, so you can quote it if you email us about a purchase.
- Your progress — step history, streaks, experience points, your monster's stage, and your journal entries.
All of this is stored in the app's private storage on your device.
4. What leaves your device
Only purchase information, and only if you buy Grumble Pro.
When you make a purchase, Grumble uses RevenueCat to validate it and to remember that you are entitled to the paid features. RevenueCat receives:
- the anonymous identifier described above
- purchase and receipt information from Apple
- basic technical information their SDK collects, such as device model, operating system version, and IP address
Apple processes the payment itself. Grumble never sees or handles your payment details, card numbers, or billing address.
RevenueCat's privacy policy: revenuecat.com/privacy
Apple's privacy policy: apple.com/legal/privacy
That is the entire list of third parties. Grumble contains no analytics SDK, no advertising SDK, no crash reporting, and no social media integrations.
5. This website
The app talks to no server of ours, but these pages have to be served from somewhere. mutterware.com is hosted on Netlify. Like any web host, Netlify processes standard request information when you load a page — your IP address, browser and operating system, the page requested, and the time of the request — in order to serve the site and keep it secure. That happens when you visit this website, and is separate from anything the app does.
We add no analytics, tracking pixels, advertising tags, or cookies to these pages, and nothing here is linked to your app data.
Netlify's privacy policy: netlify.com/privacy
6. Notifications
If you enable notifications, they are scheduled locally on your device. Grumble has no push notification server and never registers a push token. Nothing about your activity is transmitted in order to send you a reminder.
You can turn notifications off at any time in the app's Settings, or in the iOS Settings app.
7. Photos
If you choose to save a "Today's Story" card, Grumble asks for permission to add photos to your library. This permission is add-only — the app can save an image you explicitly asked it to save, and cannot read, browse, or access any other photo in your library.
8. Children
Grumble is not directed at children under 13, and we do not knowingly collect personal information from them. The app has no accounts and asks for no email address or date of birth, and we hold no profile, health, activity, or journal data on any server of ours — so in the ordinary course there is nothing for us to review or delete. The exception is the purchase record described in section 4. If you believe a child has made a purchase through the app, contact us at the address below and we will act on it.
9. Deleting your data
Because your information is stored only on your device, deleting the app removes all of it — your monster, your history, your logged activities, and your settings. This is permanent and cannot be undone or recovered, because there is no backup on any server.
Purchase records held by RevenueCat and Apple are separate from this, and are retained under their own policies. To request deletion of the purchase record associated with your anonymous identifier, contact us at the address below and we will pass the request on.
10. Your rights
Depending on where you live, you may have rights to access, correct, export, or delete personal information held about you — including under the Australian Privacy Act 1988 (Cth), the EU/UK GDPR, and the California Consumer Privacy Act.
In Grumble's case, the practical answer to most of these is the same: the data is already in your sole possession on your device, and deleting the app deletes it. We hold no server-side profile of you to produce, correct, or erase. For the purchase record described in section 4, contact us and we will act on your request.
Grumble does not sell personal information, and does not share it for cross-context behavioural advertising.
11. Changes to this policy
If this policy changes materially, the updated version will be posted here with a new "last updated" date. Continuing to use the app after a change means you accept the revised policy.
12. Contact
Mutterware — an independent software business operating from Victoria, Australia.
Email: studio@mutterware.com
Full legal and contact details are published on the Grumble App Store listing, and are available on request.