Privacy Policy: Quarter Inch: Quilt Calculator

Effective date: 12 November 2026
App: Quarter Inch: Quilt Calculator (Android), package nz.co.asynctechnology.quarterinch
Developer: Async Technology (operated by Nyan Lynn Htun)
Contact: me@asynctechnology.co.nz

This policy explains what information Quarter Inch collects, why, and what choices you have. We've tried to keep it short and in plain language.

The short version

No account and no sign-up. We never ask for your name, email address or other contact details in the app.
Your quilts stay with you. Your measurements, settings and saved quilts are stored on your device, and in your device's own Android backup if you use it. We don't receive them.
No ads. The app contains no advertising, doesn't use your advertising ID, and doesn't share data with advertisers.
We use Google's Firebase tools to count how the app's features are used and to receive crash reports, so we can fix problems and improve the app. You can turn this off in Settings.
Purchases go through Google Play. We never see your payment details.

1. Information stored on your device

Quarter Inch saves the following on your device:

the numbers you type into each calculator (so they're still there when you come back),
your settings (units, seam allowance, extra %, selvedge allowance, rounding, default fabric width, and whether you share usage statistics),
your saved quilts and quilt plans (Pro), and
whether you have bought Pro.

We don't have a server, and this information is not sent to us.

Android backup. If backup is turned on for your device, Android may include this app's data, such as your saved quilts, in your device backup in your Google account. That way your quilts come back when you set up a new phone. Android and Google do this under your device's backup settings. We can't see or access your backup. You can turn backup off in your phone's Settings (System → Backup; the wording varies by phone).

PDFs (Pro). When you share a PDF, the app creates it on your device and hands it to the app you choose (for example email or messaging). We don't receive a copy.

2. Information collected automatically

Usage analytics (Google Analytics for Firebase)

To understand which features are useful and where people get stuck, the app sends usage events to Google Analytics for Firebase. For example:

which calculator was opened, and that a result was shown,
whether "show working" or "how this is calculated" was opened,
which setting was changed (for example "seam allowance"), with preset values or just "custom",
when the Pro screen is shown and whether a purchase started, completed or failed. Google Analytics also records in-app purchases automatically (the product, its price and currency),
for Pro features, rough counts only (for example "21–60 blocks"), never your exact measurements, quilt names or anything you type.

Along with these events, Firebase automatically collects technical information such as: an app-instance ID (a random identifier for this installation of the app), device model, Android version, app version, language, approximate location (country or region, worked out by Google from your IP address; the app never asks for your location), and when and how long the app was used.

Advertising ID: Quarter Inch does not collect your device's advertising ID. The app turns off advertising-ID collection in Google Analytics and removes the advertising-ID permissions (including Android's ad-services permissions) from the app.

Crash reports (Firebase Crashlytics)

If the app crashes, Firebase Crashlytics sends us a crash report: the technical details of the error (a "stack trace"), the time of the crash, the app version, device model, Android version, available memory and storage, whether the device is rooted, and random identifiers for the installation and the session (a Crashlytics installation ID and a Firebase installation ID). Crash reports don't include what you typed into the app: we don't add any of your inputs, notes or identifiers to them.

Usage analytics and crash reports are controlled by Settings → Privacy → Share anonymous usage statistics. When it is off, the app stops sending usage events and crash reports. The app reads this setting before it sends anything.

Google Play Billing diagnostics

The app uses Google's Play Billing Library to sell and restore Pro. The library sends Google some technical diagnostic information about how billing is working on your device. Google runs this under its own terms, and the switch above doesn't control it. We don't add anything you type to it.

3. Purchases (Google Play Billing)

Pro is a one-time purchase made through Google Play. Google processes the payment under its own terms and privacy policy. We never see or store your card or bank details. From Google Play, the app receives only what it needs to unlock Pro: confirmation of the purchase, the product, the purchase time and an order reference. This stays on your device; we don't run a server. Google Play's privacy policy: https://policies.google.com/privacy

4. When you email us

If you email us, for example with the in-app "Report a number that looks wrong" button, we receive your email address and whatever is in your message. That button opens your own email app with a draft containing the calculator's inputs, units, settings, the answer and the app version. You see all of it and choose whether to send it. We use these emails only to reply to you and to fix problems.

5. How we use information

We use the information above only to:

keep the app working and fix crashes and calculation errors,
understand which features are used so we can improve them,
unlock and restore Pro, and
answer your emails.

We do not sell your information, use it for advertising, or build profiles of you.

Google processes usage analytics, crash reports, billing diagnostics and purchases for us as a service provider (Firebase and Google Play). Google's privacy policy: https://policies.google.com/privacy. How Google uses data from apps that use its services: https://policies.google.com/technologies/partner-sites
Nobody else, except where the law requires us to disclose information.

Google may process this information in the United States and other countries where it operates.

7. How long we keep it

Analytics events: kept by Google Analytics for 2 months. After that, only aggregated reports that don't identify an installation remain.
Crash reports: kept by Crashlytics for 90 days.
Emails you send us: kept for as long as we need to answer and fix the issue, and no longer than 24 months.
Data on your device: kept until you delete it in the app, clear the app's data, or uninstall the app. A copy in your Android backup follows your Google account's backup settings.

8. Your choices

Stop analytics and crash reporting: turn off Settings → Privacy → Share anonymous usage statistics. Uninstalling the app also stops all collection.
Delete your on-device data: delete saved quilts in the app, use Android Settings → Apps → Quarter Inch → Storage → Clear data, or uninstall the app. To remove the app's data from your Android backup, manage backups in your phone's settings or your Google account.
Ask us to delete data: email me@asynctechnology.co.nz. We'll delete your emails to us. Because we don't know who you are, we can usually only find analytics data if you can give us the app-instance ID. We'll explain what we can do when you write.

9. Security

Information sent to Google is encrypted in transit. Data on your device is kept in the app's private storage, which Android protects from other apps. No method of storage or transmission is completely secure, but we keep what we collect to a minimum.

10. Children

Quarter Inch is made for adult quilters and is not directed at children under 13. We don't knowingly collect personal information from children. If you think a child has sent us personal information (for example by email), contact us and we'll delete it.

11. Changes to this policy

If we change this policy, we'll post the new version at this address and update the effective date above. If a change is significant (for example, a new type of data collected), we'll also mention it in the app's release notes.

12. Contact

Async Technology (Nyan Lynn Htun), me@asynctechnology.co.nz