Weightics - Privacy Policy

The short version

Weightics is a weight-tracking iPhone app built by Marcello Gonzatto Birkan under the Mellofattura brand. It separates normal day-to-day fluctuation from real change in your weight.

The short version: your health data never leaves your iPhone. The app has no account and no server of its own. The only outside service is RevenueCat, which validates the Weightics Premium purchase and receives no health data.

What the app keeps on your device

Weightics stores, in a local SwiftData database on your device:

• your weight, waist and body composition entries, and any notes you write
• the medication doses, injection sites and side effects you choose to log
• your body profile (height, date of birth and biological sex), your goals and the trend calculations
• your settings

None of that is sent to Mellofattura servers or to any third party. Deleting an entry, a dose or a side effect in the app removes it from the local store, and deleting the app removes the whole database.

Apple Health (HealthKit)

Syncing with Apple Health is part of Weightics Premium and only happens if you grant access. With it on, Weightics reads and writes these types, under the names Health uses:

• Body Mass (weight)
• Waist Circumference
• Body Fat Percentage, when you enter it with a weigh-in
• Lean Body Mass, when you enter it with a weigh-in
• Body Mass Index, written for each weigh-in once your height is on your profile

It also reads, and never writes:

• Resting Energy, as a daily total, because Health already sums it from your Apple Watch and a typed-in figure would count twice
• Dietary Energy, as a daily total, only to show your energy use on the Analysis tab
• Protein and Water, as daily totals, only to show your seven-day average in medication mode

Those totals are read on demand and are not stored in the app.

With or without Premium, you can tap "Use my Health profile" to copy your height, date of birth and biological sex from Health into Weightics. It is a one-time read, used for body mass index and the reference ranges for body readings. Nothing is written back and nothing keeps syncing.

Medication doses, injection sites and side effects are never written to or read from Health. Every exchange with Health happens on the device, between the app and Apple Health, and you can revoke access in Settings > Privacy & Security > Health.

Health data is never used for advertising, never sold, and never shared with RevenueCat or any other third party. Weightics does not use HealthKit to store anything that is not health data.

Purchases

Weightics is free to download. Weightics Premium is available as a monthly subscription, a yearly subscription or a lifetime purchase, and a plan may come with a free trial. Payment is made and processed by Apple, through the App Store. We never see your name, your email or your card details.

To validate the purchase and restore access, the app uses RevenueCat, a service of RevenueCat, Inc. RevenueCat:

• assigns the app an anonymous identifier, with no account, email or name
• receives the purchase history and the device and app data needed to unlock Premium
• receives Apple's attribution token, which says whether Weightics was installed from an Apple Ads search ad and, if so, from which campaign and keyword. It uses no advertising identifier and needs no tracking permission
• does not receive weight, waist, body composition, doses, injection sites, side effects, notes or any other Health data

That data keeps the app working and feeds aggregate sales metrics. It is not used to track you across apps and it is not sold. RevenueCat handles it under the RevenueCat privacy policy.

Network

The app only uses the network for Premium: when it opens, it fetches the plans and checks whether Premium is active, and when you buy or restore it confirms the purchase, always with the App Store and RevenueCat. Logging, charts and the Health sync work without an internet connection.

Notifications

Weigh-in and dose reminders and the weekly report alert are local notifications scheduled on your iPhone, and they only appear if you allow them. Weightics has no notification server.

Exporting and sharing

When you export your entries as CSV or share a report, you choose where it goes through the iOS share sheet. Weightics does not send those files anywhere on its own.

What we don't do

• No analytics tools
• No crash-reporting SDK
• No ads and no advertising identifier
• No cross-app tracking
• No account, no login
• No health data off the device
• No data sold

Children

Weightics is not directed at children under 13, and we do not knowingly collect information from children.

License

Use of Weightics is also governed by Apple's Licensed Application End User License Agreement.

This website and support

This page is part of the Mellofattura website, which is a different thing from the app and has its own practices. The site is hosted on Vercel, which processes ordinary request data such as IP addresses to serve and protect it. The site also counts page views with Vercel Web Analytics. For each view, Vercel records the page address, the referring site, the country and city, the browser, the operating system and the type of device. It tells visits apart with a hash of the request, which it discards after 24 hours, and does not tie the counts to a person or an IP address. Neither the analytics nor anything else on the site sets tracking cookies. The website privacy policy has the details.

If you write to us, by email or through the contact form, we receive what you chose to send and use it to answer you.

Changes to this policy

This policy is updated when the app or its data practices change, and the new date appears on this page.

Contact

For privacy questions, email us at contato@mellofattura.com or use our contact form at Contact. Avoid sending health data that is not needed to answer you.