Privacy notice
Last updated November 13, 2026
This notice explains what Yen Lens does with information about your visit. The short version: the amounts you enter never leave your browser, and usage analytics runs only if you allow it.
What stays in your browser
The prices, incomes, currencies, and examples you choose stay in your browser’s memory for the current visit. They aren’t saved, and they aren’t sent to this site, to Google, or to anyone else.
The site stores two settings in your browser’s local storage: your appearance choice (System, Light, or Dark) and your analytics choice with the date you made it. These settings never leave your device. If your browser blocks storage, the calculator still works, and your choices last for the current visit only. In that case, the analytics cookies also end with the visit.
Usage analytics
If you select Allow analytics, the site loads Google Analytics to count visits and see which pages people use. Until you allow it, the site doesn’t load any Google code or contact Google. If you decline or don’t choose, nothing is collected.
When analytics is allowed, Google Analytics receives:
- The page you view, without any query parameters except campaign tags (such as
utm_source), and the page title. - The time and length of your visit, whether you scroll to the bottom of a page, and links you follow to other sites.
- Your browser, operating system, device type, screen size, and language.
- The page that linked you here, if your browser shares it, with the same query parameters removed.
- Your approximate location (country, region, and city), which Google derives from your IP address. Google Analytics doesn’t store IP addresses.
- A random identifier stored in cookies, so repeat visits can be counted.
Google Analytics never receives the amounts you enter, the currencies or examples you choose, or the results. Google signals, advertising features, and ad personalization are turned off, and the site doesn’t identify you by name, email address, or account.
Cookies
The site sets cookies only after you allow analytics. The cookies are limited to this site’s address and are deleted when you turn analytics off. Other sites on the same domain may set their own cookies, which this notice doesn’t cover.
| Name | Purpose | Expires |
|---|---|---|
jppc_ga | Distinguishes one browser from another with a random identifier | When your analytics choice expires |
jppc_ga_ followed by an ID | Keeps track of the current visit | When your analytics choice expires |
Why and on what basis
Analytics shows how many people use the calculator and which pages they visit, which helps decide what to improve. The legal basis is your consent (Article 6(1)(a) of the GDPR and the equivalent rules on cookies). You can withdraw consent at any time; withdrawing doesn’t affect collection that happened before.
Who receives the data
Google provides Google Analytics as a data processor under the Google Ads Data Processing Terms. Google may process data in the United States and other countries. Google relies on the EU–U.S. Data Privacy Framework and standard contractual clauses for transfers from the European Economic Area, the United Kingdom, and Switzerland. Read how Google uses information from sites that use its services and the Google Privacy Policy.
This site is hosted on GitHub Pages. GitHub logs visitors’ IP addresses for security, whether or not analytics is allowed. Read the GitHub General Privacy Statement.
Usage data isn’t sold or shared for cross-context behavioral advertising.
How long data is kept
Google Analytics deletes visit-level data after 14 months. Reports may keep aggregated counts, such as total visits per month, that don’t identify anyone. Your analytics choice expires 12 months after you make it, and the site then asks again. The analytics cookies expire at the same time.
Your choices
Select Analytics settings at the bottom of any page to allow or turn off analytics at any time. Turning it off stops collection immediately and deletes the analytics cookies.
If your browser sends a Global Privacy Control or Do Not Track signal, the site treats it as a decline, doesn’t ask, and forgets any earlier choice. Blocking cookies or scripts doesn’t affect the calculator. You can also install the Google Analytics opt-out browser add-on.
Your rights
Depending on where you live, you may have the right to access, correct, delete, or receive a copy of your personal data, and to object to or restrict its use. You also have the right to complain to your local data protection authority.
Analytics data is linked only to a random identifier, so the site owner can’t look up your data by name or email address. To make a request, include your jppc_ga cookie value if you have one.
Contact
Josh Wong runs this site and is responsible for this processing. Send privacy questions or requests to scotch_nozzles_55@icloud.com.
Changes to this notice
If this notice changes, the date at the top changes too. A change in what analytics collects means you’ll be asked again.