Weigh to Go
Privacy policy
Last updated 21 October 2026
In short
- Weigh to Go runs no server of its own: no accounts, no analytics.
- We never receive your weights or the dates of your weigh-ins. They stay on your device (and in Apple Health, if you turn it on in the app), and go only where you send them.
- The website shows no ads, and the page itself sends nothing anywhere; GitHub, which hosts it, logs visits (see below).
- The iPhone app shows only non-personalised ads from Google, whose ad software collects some data about the device, as described below. Buying “Remove ads” stops both.
The website
On weightogo.jonathas.net, your diary is kept in your browser’s storage on that device, with your screen preferences, such as the language and units. Another browser or device starts empty: a backup file is the only way the diary moves between them.
The site’s security policy forbids the page to load from other sites or send data. Its code and fonts come from the site itself, and so does the copy of the site’s files the browser keeps for offline use. Backups and CSV files are made in the page and saved to your device.
The site is served by GitHub Pages. Like any host’s, GitHub’s servers log technical details of each visit, such as your IP address and browser, as GitHub’s privacy statement describes. We don’t see those logs, and your weigh-ins are never in them.
The iPhone app
Everything you type stays in the app’s own files and storage on your iPhone. Like any app’s data, it is in your iPhone’s backup if you use iCloud Backup or back up to a computer; those backups are kept by Apple or on your computer, not by us. With Apple Health on, the weights you type are in Health too, which Apple keeps as it keeps the rest of your Health data.
A backup or CSV file you export goes only where you send it, through the share sheet (Files, AirDrop, Mail or another app you choose); the app keeps no copy once the sheet closes. The backup holds what you typed in the app (weights, goal, height); the CSV also has the days read from Apple Health.
If you turn on “Share with App Developers” in your iPhone’s settings, Apple shares crash reports and statistics about how you use the app with us, as it does for every app. It is off unless you turn it on.
Apple Health
Apple Health is optional, and off until you turn it on in the app. The app then reads and writes weight only: it reads the readings of a smart scale or another app, and saves there the weights you type.
What the app reads from Health stays on your iPhone, in memory while the app is open. It isn’t kept in the app’s files (only for a moment, in a CSV you export) or in its backup file, so it never reaches iCloud through us. The app reads it again from Health each time it opens.
Health data is never used for ads, nor for anything but your diary in the app, and never reaches Google.
You control the app’s access in the Health app: tap your picture, then Apps under Privacy, Weigh to Go.
The daily reminder
The app’s daily reminder, off until you turn it on, is a set of local notifications planned on your iPhone. Nothing is sent anywhere to show them.
Ads in the app
The iPhone app shows a banner ad from Google AdMob; the website shows no ads. The app shows only non-personalised ads: it never asks to track you and doesn’t use your device’s advertising identifier (IDFA).
To show ads, measure them and prevent fraud, Google’s ad software in the app (the Google Mobile Ads SDK) collects data about your device and how the ads are used: for example your IP address, the device’s model and operating system, an identifier the iPhone keeps for this app’s maker (IDFV, not the advertising identifier, IDFA), advertising data such as the ads shown and your interactions with them, an approximate location worked out from the IP address, and crash and performance data. Google uses that data as its own policies describe:
Google keeps this data for as long as its policies say. What it receives from the app never holds a weigh-in, its date or anything from Apple Health.
In the European Economic Area, the United Kingdom and Switzerland, Google’s consent message appears in the app, and the app starts Google’s ad software only once you consent. If you refuse, the app doesn’t start Google’s ad software and shows no ads.
The message comes from Google’s consent tool, which the app starts before any ad and which contacts Google to know whether a message is needed where you are.
There, and in US states whose laws give you choices, you can change your choices in the app’s settings, under “Privacy choices”.
Buying “Remove ads” stops the ads, and the app no longer starts Google’s ad software or its consent tool, so it sends Google nothing.
The purchase and ratings
“Remove ads” is a one-time purchase handled by Apple: we receive no payment details. The app checks the purchase on your iPhone, with Apple’s own tools and no purchase service in between.
When the app asks for a rating, it uses the iPhone’s own prompt: a rating you give goes to Apple, not to us.
Children
Weigh to Go isn’t made for children.
Deleting everything
On the website: “Your data › Erase everything”, or clear the site’s data in your browser’s settings.
In the app: “Your data › Erase everything”, which can also delete the weights the app saved in Apple Health. Deleting the app erases its files but leaves those weights in Health: use “Erase everything” first, or delete them in the Health app. Earlier backups of your iPhone keep their copy until they are replaced or deleted.
To take back the app’s access to Health, open the Health app, tap your picture, then Apps under Privacy, Weigh to Go.
Legal bases and your rights
Your diary and your Health data: we process none of it. It stays with you, and the section above says how to delete it.
Google’s ad software: where the law asks for it, it runs on your consent, given in Google’s message; elsewhere, on our legitimate interest in funding a free app with non-personalised ads. Google’s consent tool, which asks for that consent, runs on our legitimate interest in asking, as the law requires. Google may process the data outside your country, for example in the United States.
A message you send us: we use it to answer you, on our legitimate interest in answering you.
We hold nothing about you except a message you send us, which you can ask us to show you or delete, and, if you turned it on, Apple’s anonymous crash reports and usage statistics.
Google answers for the data its ad software collects: make requests about it to Google, as its privacy policy explains.
Where the app shows “Privacy choices”, you can withdraw your consent or object there at any time. Anywhere, deleting the app or buying “Remove ads” stops the collection.
You can also complain to a data-protection authority: the ANPD in Brazil, or your local authority in the European Economic Area, the United Kingdom or Switzerland.
Changes
If what the app or the website does with data changes, this policy changes with it, and so does the date at the top.
Who we are and contact
Weigh to Go is made by Jonathas Costa, who is responsible for the data this policy describes (the controller).
Questions and requests go through the project’s issues on GitHub:
Issues are public: don’t post your weights or other personal data there.
An issue, with your GitHub username, is public and stays on GitHub until it is deleted. You can edit what you wrote or delete your comments; editing keeps earlier versions in the edit history, where you or we can delete them. We’ll delete an issue you opened if you ask in it. Copies made outside our reach, such as notification emails or archives of public GitHub activity, may remain.