HALFDOT Privacy Version of 10 November 2026 Who is responsible: Amit Karta, contact@amitkarta.com. THE SHORT VERSION * Your pictures, your settings and your prints never leave your Mac. * The app has no accounts, no analytics, no tracking, no ads and no crash reporting. * Once a week the app reads one small file on halfdot.app to see whether a new version is out. That request carries only the app's version number. * Apart from that, the free version sends nothing over the internet. * To get the free version you give us your email address, through our payment store, so we can send you the download link. We send you anything else, such as tips and news, only if you ask for it. * The full version sends your license key and a random device label to the license service of our payment store, only to activate, deactivate and check the license. WHAT THE APP SENDS, AND WHEN The update check. Once a week, and when you choose Halfdot › Check for Updates…, the app asks for one small file, https://halfdot.app/version.json, which names the newest version. The request carries only the app's version number, in a standard header that every app sends; no license key, no device label, nothing about you or your pictures. If a check fails, the app tries again the next time it opens. Like any visit to a website, the request shows your IP address to Cloudflare, which delivers our site (see THIS WEBSITE below). If a new version is out, the app shows a small note; nothing is downloaded or installed unless you choose to. Only if you enter a license key (the full version). The app then talks to the license service of our payment store, currently Lemon Squeezy (api.lemonsqueezy.com), over an encrypted connection (HTTPS): 1. When you activate: your license key, and a device label. The label is the word "Mac" plus 8 random characters that the app makes up for that activation. It is not your name, not the name of your Mac and not a hardware number. 2. When you deactivate: your license key and the activation ID that the store gave you when you activated. 3. About once every 30 days, while your Mac is online, quietly in the background: your license key and the activation ID, to check that the license is still valid (for example that the purchase was not refunded). If your Mac is offline the app does nothing and keeps working. If the store says the license is no longer valid, the app removes the saved license from your Mac and goes back to the free version. Like every request on the internet, these requests show your IP address and the time to the store's servers, and the app names itself "Halfdot/1.0" in the request. We add nothing else. The store handles these requests under its own privacy policy. If you click the Buy button, your web browser opens the store's page. That page belongs to the store. THIS WEBSITE (halfdot.app) The website sets no cookies and runs no analytics, tracking pixels, ads, or scripts, fonts or embeds from other companies. Every page, picture and script comes from halfdot.app itself. The website and the free download are delivered by Cloudflare. To deliver a page and protect the site, Cloudflare processes the technical data of each request (IP address, time, address requested, browser type) under its own privacy policy. We do not use these records to identify visitors. "Send to My Mac" and "Email Me the Link" use your own device's share sheet, clipboard or mail app. The website receives nothing from them. The Buy and Download buttons open the checkout of Lemon Squeezy, our merchant of record, on its own website, where its privacy policy applies. WHAT THE APP DOES NOT SEND Your pictures, your prints, their file names, your settings, how you use the app, your name, your email address, or the name of your Mac. Apart from the update check and the license check described above, the app does not contact any server by itself. WHAT STAYS ON YOUR MAC * Your saved license (key, activation ID and dates), in ~/Library/Application Support/com.amitkarta.halftoneprolab/license.json. Deactivating removes it. * Your last settings, calculated paper data, a marker that the app has opened before, and the result of the last update check (when it checked, the newest version it saw, and a version you chose to hear about later), in the same folder. They are not made from your pictures. * A log file, ~/Library/Logs/com.amitkarta.halftoneprolab/server.log, with technical messages from the app. Nothing sends it. If something goes wrong we may ask you to send it; it can contain file names. * Working copies of the picture you open and of unfinished prints, in a temporary folder. The app removes them when you close it. * The prints you export, where you choose to save them (by default the Downloads folder). The window of the app talks to the app's own engine through a connection that works only inside your Mac (the address 127.0.0.1, protected by a random key made at every start). Nothing outside your Mac can use it. THE FREE DOWNLOAD To get the free version, you enter your email address (and, if asked, your name and country) in a short checkout run by our payment store, currently Lemon Squeezy. It costs nothing. The store sends you the download link and tells us your email address and country. We use your email address to send the download link, and to answer you if you write to us. We send you anything else, such as tips and news about Halfdot, only if you have agreed to receive it; every such email has a link to stop them, and you can write to us at any time to be removed. We do not sell your email address and do not pass it on. THE PURCHASE The purchase is handled by the payment store, under its own terms and privacy policy. We never see your card number. The store tells us who bought (such as your email address and country) and what, so that we can deliver the license, give support and keep the records the law requires. We do not sell your data and we do not pass it on for marketing. YOUR CHOICES To ask what we hold about you, or to have it corrected or removed as far as the law allows, write to contact@amitkarta.com. The store keeps its own records under its own policy. CHANGES A new version of the app may come with a new version of this file. The date at the top says which one you have.