Last updated November 11, 2026
This Privacy Notice for unglazed (“we,” “us,” or “our”) describes how and why we might access, collect, store, use, and/or share (“process”) your information when you use our services (“Services”), including when you:
Download and use our mobile application Lightning TOPIK (the “App”) on iPhone or Android, including its widgets, or any other application of ours that links to this Privacy Notice
Visit our website at lightning-topik.com (the “Site”)
Engage with us in other related ways, including any support conversations
Questions or concerns? Reading this Privacy Notice will help you understand your privacy rights and choices. If you do not agree with our policies and practices, please do not use our Services. If you still have any questions or concerns, please contact us at ung@sai-korean.com.
What personal information do we process? Almost none. Lightning TOPIK has no accounts and no sign-up. The App does not collect your name, email address, phone number, contacts, or location from your device’s location services, and the iPhone App does not collect Apple’s advertising identifier (IDFA). We record usage events tied to an app-generated install identifier that is not linked to your identity — see Section 1. On Android, the App also shows ads from Google AdMob, and Google’s ads software collects the information it needs to serve them: your device’s Android advertising ID, your IP address (from which Google may estimate your general location) and other device and ad-interaction information — see Section 2.
Where is my study progress? On your phone. Your words, reviews, plan, exam date, and settings are stored in the App’s storage on your iPhone or Android phone, which the App’s widget also reads. We run no server for the App and have no copy of your progress. If you use your phone’s own backup (iCloud Backup on iPhone, Google’s backup on Android), it may include your study progress; it is kept with Apple or Google, we cannot see it, and a reinstall or a new phone may restore your progress from it.
Do we use tracking or ads? The iPhone App contains no advertising and no cross-app or cross-site trackers. It does not collect IDFA and shows no App Tracking Transparency prompt. The Android App is free and shows ads from Google AdMob until you buy Remove ads; where the law requires it (for example in the European Economic Area, the United Kingdom and Switzerland), it asks for your consent before the first ad — see Section 2. Both apps use Google Analytics for Firebase for product analytics (we read aggregated reports); Google, through Firebase Analytics, may also receive this data under Firebase’s data-sharing settings — Section 3 sets out who receives what.
What about the website? The Site has no accounts and sets no cookies. Cloudflare delivers it, and we count visits with Cloudflare Web Analytics, which stores nothing on your device and does not identify you — see Section 1.
How do I pay? On iPhone, the Lifetime unlock is an Apple in-app purchase: Apple handles payment, and the App never receives your payment details or Apple ID. On Android, Remove ads is a Google Play in-app purchase: Google handles payment, and the App never receives your payment details or Google account; Google Play gives us order records only.
How do I delete my data? Delete the App: that removes your study progress from your phone. If you also back up your phone, that backup follows your backup settings with Apple or Google; delete it or turn it off in your iCloud or Google account settings.
Information you provide. Lightning TOPIK requires no account and no registration. The App does not ask for, and does not collect, your name, email address, phone number, contacts, or location from your device’s location services. The iPhone App collects no advertising identifier. On Android, the ads software in the App collects your device’s advertising ID and IP address, as described in Section 2.
Information stored on your device. Your study data — the TOPIK level you choose, the words you study and how you rate them, review schedules, saved words, your study plan and exam date, reminder times, and settings — is stored in the App’s private storage on your device. The App’s widget (on iPhone, the lock screen widget; on Android, the Home screen widget) reads the same storage to show today’s word. This data is not sent to us. If you use your phone’s own backup (iCloud Backup on iPhone, Google’s backup on Android), the backup may include this data. It is kept with Apple or Google under your account, we cannot see it, and a reinstall or a new phone may restore your progress from it.
Apart from your phone’s own backup and the online voice described under Device features, the only information that leaves your device is:
Device features. On iPhone, word pronunciation is spoken by Apple’s on-device speech synthesis. On Android, it is spoken by the text-to-speech engine set on your device (for example, Google’s Speech Services); if that engine uses an online voice, the word being spoken is sent to the engine’s provider to be read aloud. The App does not use the microphone or record audio. Study reminders are local notifications scheduled on your device, only if you allow notifications; we run no push notification server.
Our website. The Site has no accounts, no forms and no advertising, and it sets no cookies. Cloudflare delivers it: as with any website, your browser sends your IP address, the page you ask for, the page that referred you and your browser’s user agent, and Cloudflare uses them to deliver the page and to protect the Site from attacks; we see only aggregated traffic reports. Each page also loads Cloudflare Web Analytics, a small script that reports the page you viewed, the page that referred you, your browser, operating system and device type, an approximate country, and how fast the page loaded. It stores nothing on your device (no cookies or local storage) and does not fingerprint or identify you; we see only aggregated counts. The Site’s store buttons link to the App Store and Google Play with a label for the page they are on, so Apple and Google can report to us, in aggregate, how many installs came from the Site.
This section applies only to the Android App. The iPhone App shows no ads.
Ads. The Android App is free and shows native ads from Google AdMob in three places: on the Home tab below your study card, in a small unit above the word card during a review, and on the page after a session. It shows no ads during onboarding or on your first day, and none after you buy Remove ads. We limit ads to content suitable for everyone (AdMob’s “G” rating), matching the App’s own rating.
What Google’s ads software collects. To choose, show and measure ads and to prevent fraud, the Google Mobile Ads SDK in the App automatically collects and sends to Google:
Google uses this information as described in Google’s Privacy Policy and on How Google uses information from sites or apps that use our services. You can reset or delete your advertising ID in your Android settings (usually Settings › Google › Ads, or Settings › Privacy › Ads; the path depends on your device); after you delete it, ads can no longer be personalized with it.
Your consent. Where the law requires consent for ads (for example in the European Economic Area, the United Kingdom and Switzerland), the App shows Google’s consent message, provided through Google’s User Messaging Platform, before the first ad. It never appears during onboarding. Your choices are stored on your device in the standard format of the IAB Transparency & Consent Framework, and you can change them at any time in Profile › Privacy choices. If you decline, you may still see ads that are not personalized, as Google allows. Where your consent is required, Google Analytics for Firebase’s analytics storage stays off until you give it; until then it may still send Google usage events without device or user identifiers, which Google uses for modeling. We do not use Firebase for advertising: its ad storage, ad user data and ad personalization settings are switched off. For users whose device is set up in the United States, ads in the App use Google’s restricted data processing.
Remove ads. Remove ads is a one-time Google Play in-app purchase. Google handles the payment; the App asks Google Play for the price and whether you own it, whenever you open the App, so it can turn the ads off. After you buy it, the App stops loading ads and the ads software no longer starts.
Permissions. The Android App, and the Google software built into it, declare Android permissions in these groups: notifications, and restoring study reminders after your phone restarts; internet access and network status, which the ads, analytics and purchase software need; Google Play purchases (billing); keeping the phone awake while background work runs; and, for the ads and analytics software, advertising and measurement permissions: the advertising ID, Android’s ad services, the Google Play install referrer, and basic phone state, which lets the ads software read basic, non-sensitive phone information such as the type of mobile network, never your phone number, calls or contacts. The App does not ask for permission to read your contacts, location, microphone, camera, photos, files, calls or messages.
We share information only with the companies that provide the services the App and the Site need:
Who receives what: Google receives the usage events described in Section 1, which it may use for its own purposes as described above, and, in the Android App, the ads information described in Section 2. Apple, or Google on Android, processes the purchase you make. Cloudflare processes visits to the Site. We use neither your study data nor your usage events for advertising or cross-app tracking. We may disclose information if required by law, but as described above, we hold effectively no information about you to disclose, beyond what you email us and, on Android, the order records Google Play gives us.
Your study data stays on your device, protected by its operating system; any backup of it that your phone makes is held and protected by Apple or Google. Usage events and ads information are sent to Google over encrypted connections (HTTPS/TLS). We have implemented appropriate technical measures designed to protect the limited information we process. However, no electronic transmission over the internet can be guaranteed to be 100% secure.
Depending on where you live (for example, the Republic of Korea, the European Economic Area, the United Kingdom, or California), you may have rights such as access, correction, deletion, and portability of your personal information, and the right to withdraw consent.
Because Lightning TOPIK keeps your study data on your device, with no study data on our side, you can delete it at any time by deleting the App, which removes it from your phone. A backup of it that your phone made follows your backup settings: delete it or turn it off in your iCloud or Google account settings. On Android, where the App asked for your consent, you can withdraw or change it in Profile › Privacy choices, and you can reset or delete your advertising ID in your Android settings. If you have any privacy question or request, contact us at ung@sai-korean.com and we will respond in accordance with applicable data protection laws.
Our Services are not directed to children under 14 (or the equivalent minimum age in your jurisdiction), and we do not knowingly collect personal information from children. The App has no accounts and no social features. The iPhone App shows no advertising; the Android App, which shows ads, is listed on Google Play for users aged 18 and over. If you believe a child has provided us personal information through the support email, contact us and we will delete it.
Google Analytics for Firebase, and in the Android App Google’s ads services, may process information on servers located in the United States or other countries. Cloudflare delivers the Site from data centers around the world and may process visit information in the United States or other countries.
Yes, we will update this notice as necessary to stay compliant with relevant laws. The updated version will be indicated by an updated “Last updated” date at the top of this Privacy Notice. We encourage you to review this Privacy Notice from time to time.
If you have questions or comments about this notice, you may email us at ung@sai-korean.com, or contact us by mail at:
unglazed 23, Bongeunsa-ro 50-gil, Gangnam-gu Seoul 06145 South Korea
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