Ten Thousand Lights Privacy Policy
Effective date: November 10, 2026 (previous version: October 13, 2026)
Mitochondria Studio (Dohoon Lee) ("we", "us") operates the Ten Thousand Lights app (the "Service"). This policy explains what we collect, why, and the choices you have.
1. What we collect and why
| Category | Data | Purpose |
|---|---|---|
| Account | Email address, a unique ID from your sign-in method (Apple, Google, Kakao, Naver or email), your name or nickname | Identify your account; back up and restore across devices |
| Email sign-up | Email address and password (stored hashed) | Sign-in |
| What you write | Lines, numbers, dates, notes, photos (see section 3), list names | Automatic backup, restore on a new device, shared lists |
| Sharing and gifts | Display name, author labels, invite codes, gift messages | Shared lists and gifts |
| Lights+ | Whether you have Lights+ and when it expires, an account ID used for purchases | Provide paid features and restore purchases |
| Generated automatically | Usage and access logs on our servers | Fix problems and prevent abuse |
| Anonymous usage counts | A random ID created per installation; counts of app opens, first line written, notifications opened, shares; device type (iOS/Android); app version | Improve the app (return rates, feature use). Never linked to your account and never includes anything you wrote |
| Error reports | When the app hits an error: the error details, device model, OS version, app version | Find and fix bugs. Never includes your account or what you wrote |
| Notifications | Your device's push token, notification settings (shared-list alerts, hide text), language | Alert you when someone adds a line to a list you share |
| Public shares | A line and its number that you choose to share | A page anyone with the link can view. Deleted when you withdraw the share or delete your account |
| Someone's light | A line you turn on "Show to others too" for, its number and language, and your account identifier (kept on the server for moderation only, never shown to other users) | Showing the line to other users without your name. Deleted at once when you turn it off, hide or erase the item, or delete your account |
| Reports and blocks | Lines you report, the reason and time, and whose lines you chose to stop seeing | Reviewing and hiding inappropriate lines; not showing you lines from people you blocked. Deleted with your account |
- If you choose Apple's "Hide My Email", we receive Apple's relay address.
- We do not collect advertising identifiers, we do not use advertising tools, and we do not track you across other apps or websites. Our own usage counts are anonymous and stay with us.
- Payment details (such as card numbers) are handled by Apple and Google; we never receive them.
2. How long we keep it
- When you delete your account (Settings → Data → Delete all data), we delete your personal data without delay, including any line you were showing to others and your reports and blocks.
- Copies in our server's disaster-recovery backups are removed automatically within 7 days.
- We keep information longer only where the law requires it.
3. Where photos are stored
- Personal lists: photos stay on your device. With Lights+, they are also backed up to our servers.
- Shared lists: photos are stored on our servers so other members can see them, and only members of that list can access them.
4. Sharing with others
We do not sell or share your personal data with third parties. Content you choose to share is visible as follows:
- Gifts: the items you pick, your display name and message are visible to anyone who has the gift link.
- Shared lists: your items and display name are visible to members of that list.
- Someone's light: only for items where you turn it on yourself, the line and its number appear to other users as "Someone's light". Your name, photo, note, date and account details are never shown, and we never tell other users who wrote it. You can turn it off at any time and it comes down immediately. Lines with contact details, links or profanity are filtered automatically, and reported lines are hidden and reviewed within 24 hours.
5. Service providers and international transfers
| Provider | Location | Data | Purpose |
|---|---|---|---|
| Supabase, Inc. | Data hosted in Seoul, South Korea; company based in the USA | Account data, your lists and photos | Storage, authentication, backup |
| RevenueCat, Inc. | USA | Account ID, purchase history | Subscription status and purchase restore |
| Functional Software, Inc. (Sentry) | USA | Error reports (section 1) | Collect and analyze app errors; kept for 90 days |
| 650 Industries, Inc. (Expo) | USA | Push tokens, notification text | Relay push notifications |
We receive the account data in section 1 from Apple, Google, Kakao or Naver when you sign in with them. Purchases are processed by Apple (App Store) and Google (Google Play) under their own privacy policies.
6. Your choices and rights
- Edit or delete any item you wrote, export a backup file, or delete all of your data from within the app.
- You can also ask us to access, correct or delete your data, or to stop processing it, by emailing contact@mtcstudio.net. We will respond without undue delay.
- Depending on where you live (for example the EU/UK, California or Korea), you may have additional rights under local law, including the right to complain to your data protection authority.
- Deleting your data does not cancel a Lights+ subscription. Cancel it in your App Store or Google Play settings.
7. Children
The Service is not directed to children under 14 (or the minimum age in your country), and we do not knowingly collect their data. If we learn that we have, we delete it promptly.
8. Security
Encryption in transit (HTTPS), hashed passwords, row-level access control so only you and your list members can reach your data, private photo storage with time-limited links, and least-privilege administrative access.
9. Changes
If this policy changes, we will post the new version in the app or on our website at least 7 days before it takes effect.
10. Contact
Mitochondria Studio (Dohoon Lee) · contact@mtcstudio.net