Privacy Policy

In short

• Chronoptica collects no data about you. Its App Store privacy label is Data Not Collected.
• There are no accounts, no ads, no analytics, no tracking and no third-party code in the app.
• Your settings stay on your device. We never see them.
• The app goes online only when you tap a link to an outside site, such as Wikipedia.

Who we are

Chronoptica is published by Gotoh Industries LLC (“we”, “us”). This policy covers the Chronoptica app on iPhone, iPad, Mac and Apple Vision Pro, and this website, chronoptica.com.

What the app collects

Nothing. The app does not send any information about you or how you use it to us or to anyone else. It contains no advertising, analytics, crash-reporting or tracking code, from us or from any other company, and it does not ask for your contacts, location, photos, camera, microphone or any other personal data. You don't sign in, because there is no account.

The history you explore is built into the app. Browsing lanes, zooming, searching and opening an item all happen on your device, without a network connection.

What the app keeps on your device

To work the way you left it, the app saves a small amount of information in its storage on your device:

• your choices in Settings, such as whether the time ruler shows how many years ago each year was;
• the view you were looking at, so the app can reopen where you left off;
• small records of what you have already seen, such as an introduction shown only once.

This information never leaves your device through the app, and we cannot see it. Your device may include it in a backup you make with iCloud or a computer, which Apple or you control. Deleting the app deletes it.

The privacy manifest built into the app lists one kind of system access: the app reads and writes settings storage that only it can reach (Apple’s “user defaults”, reason CA92.1, “to access information that is only accessible to the app itself”). It declares no tracking, no tracking domains and no collected data types.

Links you open

Each item can link to outside sites: “Read more on Wikipedia”, and links to the sources behind its dates, such as a publisher’s page, a journal article, the WorldCat library catalog or Open Library. Nothing is loaded from those sites until you tap a link. When you do, the page opens in Safari inside the app (on iPhone and iPad) or in your default browser (on Mac and Apple Vision Pro), and that site’s privacy policy applies to your visit. We don’t learn which links you open.

Some book sources may offer a “Buy on Amazon” link. If one does, the app says so under the sources, and the link may tell Amazon that the visit came from Chronoptica so that we can earn a commission on a qualifying purchase. Amazon does not tell us who you are or what you buy, and the app shares nothing with Amazon beyond opening the link.

Links you copy and share

When you copy or share a link to a lane, an item or a view, the link describes only what is on screen (which lanes, which years, which item). It contains nothing about you. Where you send it is up to you.

If Handoff is turned on, your Apple devices may offer the view you are looking at on your other devices signed in to the same Apple Account. Apple handles Handoff between your devices; we receive nothing.

Purchases (coming later)

Chronoptica is free. When paid content packs arrive, they will be sold as in-app purchases through the App Store. Apple processes every payment. We never receive your name, your payment details or your Apple Account. The app asks the App Store on your device which packs you own, so it can unlock them, and Apple sends us only sales reports that do not identify you. Family Sharing and refunds are handled by Apple under its terms.

Information Apple may share with us

If you choose to share analytics with app developers in your device’s privacy settings, Apple may send us crash reports and usage statistics that do not identify you, which we use only to fix problems. You can turn this off at any time in Settings › Privacy & Security › Analytics & Improvements on iPhone, iPad and Apple Vision Pro, or in System Settings › Privacy & Security › Analytics & Improvements on Mac.

If you write to us

If you email us, we receive your email address and whatever you write. We use it only to answer you and, if you report an error in a date, to correct it. We don’t add you to a mailing list, we don’t share your message, and we delete it when we no longer need it to help you. If you ask us to credit you for a correction, we will use the name you give us.

This website

chronoptica.com uses no cookies, no analytics, no trackers, no advertising, no scripts and no fonts or other files from other sites. It is hosted by Cloudflare, which, like any web host, processes technical information such as your IP address to deliver pages and protect the site from attacks. We do not use that information to identify or follow you.

Children

Chronoptica is made for everyone, including children and students. Because the app collects no data from anyone, it collects none from children.

Your choices and rights

Wherever you live, you can ask us what information we hold about you and ask us to delete it. For the app, the answer is none: everything it keeps stays on your device, and deleting the app removes it. For email, write to us and we will tell you what we have and delete it on request.

Changes to this policy

If we change what the app or this website does with information, we will update this page and its effective date before the change takes effect. If a change would mean collecting any data, we will update the App Store privacy label first and tell you in the app’s release notes.

Contact

Gotoh Industries LLC
Email: support@chronoptica.com