RacketCheck — Privacy Policy
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The short version
RacketCheck keeps everything on your phone. There are no accounts, no servers of ours, and no analytics. Your rackets, string jobs and measurements are stored in a database file on your device and are never uploaded anywhere.
Two things leave your phone, and only because you chose to send them: a message you write on the support form, and a subscription purchase, which Google Play handles. Everything else stays put.
Who this is from
We’re passionate people, developing apps for sports!
RacketCheck is made by meMilli, an independent app studio based in Belfast. We’re responsible for the limited personal data described in this policy, and you can reach us at:
Office 1971, 92 Castle Street Belfast, Northern Ireland, BT1 1HE
If you want to ask about anything in this policy, or ask for a message you sent to be deleted, use Settings → Help → Message the developer in the app, or write to RacketCheck at memilli dot app.
What the app stores, and where
Everything you enter or measure is written to a database file in RacketCheck’s own private storage on your device:
- Rackets: name, weight, balance point, head size, string pattern, notes, and a photo if you add one
- String jobs: string name, gauge, linear density, machine tension, dates
- Tension readings: frequency, calculated tension, timestamps
- Swing weight results: the measurement, the rig geometry it used, and the spread of the timed swings
- Your settings: units, alert thresholds, reminder intervals, calibration
None of this is transmitted. It is not backed up to any service by us. On Android, whether the operating system includes the app’s files in your own device backup is a setting you control in Android, not something the app does.
Racket photos you add are copied into the app’s private storage. RacketCheck reads the photo you pick and nothing else in your gallery.
Microphone
Measuring string tension works by listening to the note a string bed makes when you tap it. While a tension measurement is running, the app receives live audio from the microphone and analyses it in memory to find that frequency.
No audio is recorded, saved, or transmitted. The samples are examined and discarded as they arrive; nothing is written to a file, and the app has no means of sending audio anywhere. Only the resulting frequency number, if you choose to log it, is stored.
The microphone is used only while a tension measurement or the Audio Lab diagnostic screen is open.
Camera
Measuring swing weight works by watching a hanging racket swing and timing it. While a swing weight measurement is running, the app receives camera frames and measures how much movement is inside the on-screen box.
No video or images are recorded, saved, or transmitted. Frames are compared against the previous frame and discarded. Audio recording is switched off for the camera. Only the resulting period and swing weight, if you choose to save them, are stored.
The camera is used only while a swing weight measurement is open.
Notifications
If you turn on restring reminders, the app schedules local notifications on your device. These are generated on the phone; nothing is sent to or from a server, and no notification service of ours is involved.
Subscriptions
RacketCheck Pro is an annual subscription sold through Google Play. Google handles the purchase and is the merchant of record. We never see or receive your payment details. The app receives only whether an active entitlement exists, and stores that answer locally.
Google’s handling of your purchase is covered by Google’s own privacy policy.
Backup and export
Saving or sharing a backup produces a file containing your rackets, string jobs and measurements. That file goes wherever you send it — a folder you pick on your phone, or an app you choose from the share sheet. Once it leaves the app it is under your control and this policy no longer governs it. Racket photos are not included in the file.
Restoring reads a file you pick and adds its contents to what is already on the device.
Messaging the developer
The support form in Settings builds a message and hands it to your own email app to send. When you send it, we receive what you wrote, the email address you send from, and two technical details appended visibly to the bottom of the message: the app version and your operating system version.
Nothing else is attached — no measurements, no racket data, no device identifiers, no automatic diagnostics. You can see and edit the whole message in your mail app before it goes.
We use these messages only to answer you and to fix the problem you reported. Our lawful basis is legitimate interests — responding to a request you chose to send us. We keep support correspondence for up to 12 months after the matter is resolved, and then delete it. You can ask us to delete it sooner at any time.
Your rights, and how to complain
The data in the app is on your device and under your control, so there is nothing for us to hand over or erase. For the support email correspondence described above, meMilli is the controller and UK GDPR gives you the right to:
- Access a copy of what we hold
- Correct anything inaccurate
- Erase it
- Object to our processing, or ask us to restrict it
- Receive it in a portable format
Write to RacketCheck at memilli dot app to exercise any of these. We will respond within one month.
If you are unhappy with how we have handled your personal data, you can complain to the UK’s supervisory authority, the Information Commissioner’s Office, at ico.org.uk or on 0303 123 1113. You are welcome to raise it with us first, but you do not have to.
What RacketCheck does not do
- No user accounts and no sign-in
- No advertising, and no advertising identifiers
- No analytics, crash reporting, or usage tracking of any kind
- No third-party SDK that collects data about you
- No selling or sharing of personal information — there is none held to sell
- No location access
- No access to contacts, messages, or files beyond a photo and a backup file you explicitly choose
Children
RacketCheck is a tool for racket sports players and is not directed at children. It collects nothing that would identify anyone, of any age.
Your control over your data
Because the data lives on your device:
- See it: everything is visible in the app. Settings → Developer → Stored data shows the database file and how many rows it holds.
- Take it: Settings → Your data → Save to phone writes your full history to a file you keep. This is available whether or not you subscribe.
- Delete it: deleting a racket removes its string jobs and measurements. Uninstalling RacketCheck removes the database, the photos and the settings from your device. There is no copy elsewhere for us to delete.
Permissions the app asks for
| Permission | Why |
|---|---|
| Microphone | To hear the string bed while measuring tension |
| Camera | To watch the racket swing while measuring swing weight |
| Photos / media | Only when you pick a photo for a racket |
| Notifications | To show restring reminders you asked for |
| Run after restart | So scheduled reminders survive a reboot |
Changes to this policy
If this policy changes, the date at the top changes with it. Material changes will be noted in the app’s release notes.