TodayCheck Privacy Policy

Version 1.9 · Effective date: November 7, 2026

This is a translation. If it differs from the Korean version, the Korean version prevails.

Change history: 1.9 (2026-11-07) Stated that device OS backups (iCloud, Google) may include app data · 1.8 (2026-10-29) Removed bottom banner ads, and removed the sections on the advertising identifier, Google AdMob, and turning off personalized ads · 1.7 (2026-10-29) Changed where app usage statistics are sent to PostHog (United States), and added transfer details and how to turn statistics off in Settings · 1.6 (2026-10-19) Added bottom banner ads to the Android app (from version 0.4.5) and instructions for turning off the advertising ID · 1.5 (2026-10-17) Extended the data copied for the home screen widget from 7 days to 30 days · 1.4 (2026-10-14) Changed app usage statistics to count by installation ID (changed analytics server) · 1.3 (2026-10-10) Added anonymous app usage statistics, device calendar connections (multiple calendars), to-do reminders, and backup files · 1.2 (2026-10-05) Added storage locations when device calendar sync is enabled and routine reminders · 1.1 (2026-09-28) Added bottom banner ads and instructions for turning them off · 1.0 (2026-09-27) Initial release

1. Personal information we collect

TodayCheck works without an account. Content you enter, such as to-dos, routines, and countdowns, is stored on your device (including any device calendars you connect). It is not sent to us, the operator.

Category	Information	Purpose	Retention
Error information	Error details, app version, OS, and device model	Fix errors	90 days on servers in South Korea
App usage statistics	Screens and features used (for example, creating a routine or turning on reminders), app installation ID (a random number created when the app is installed), app name and version, OS type and version, device manufacturer and model, screen size, language and time zone, network type (Wi-Fi or mobile), and carrier name (Android)	Improve the app by understanding how many people use it, popular features, and steps where people get stuck	Kept for the retention period of our analytics service, PostHog (1 year). Not linked to personally identifying information
Account (if you sign up to enable sync)	Email address, nickname, and social account identifier	Sign-in and sync across devices	Deleted immediately when you delete your account

Error information and app usage statistics do not include your email address, nickname, or content you enter in the app, such as to-do titles and notes.

We count app usage statistics using a random number created when the app is installed. This is not an advertising ID or a unique device identifier. It disappears when you uninstall the app, and a new number is created when you reinstall it. The number is not shared with other apps or used for tracking (linking information from other companies' apps or websites). We do not record your screen. We set up our analytics service, PostHog, so that it does not store IP addresses or infer locations from them. If you turn off Settings > Send usage statistics in the app, we stop sending them from that point.

2. Where personal information is stored

Data used without an account: Stored on your device and deleted when you uninstall the app. See below for events in connected device calendars. If you turn on your device's OS backup (iCloud Backup or Google backup), the app's data is included in that backup and moves with it to a new device. That is between you and Apple or Google; we do not receive it.
Home screen widget: To-do and routine titles for 30 days starting today are copied to the app's dedicated storage on your device for display in the widget. They do not leave your device.
Device calendar connections (if connected): The titles, dates, and times of to-dos and countdowns added to a connected calendar are recorded in that calendar. Events from that calendar are imported into the app. If the connected calendar belongs to a cloud account, that service syncs it with the account. This is between you and that service. We do not receive calendar content. When you disconnect a calendar, its events remain in the calendar and are removed only from the app.
Routine and to-do reminders (if enabled): Notifications for the times you set are scheduled on your device. Routine and to-do names appear in notifications and are not sent to us.
Backup files (if created): The app's data is packaged into a single file, which you save or send to a place you choose, such as a files app or messenger. It is not sent to us.
App lock (PIN): Stored only in your device's secure storage. We cannot access it.
Account data (if you sign up for sync): Stored on servers in South Korea that we operate ourselves (Oracle Cloud, Chuncheon region).

3. Sharing with third parties and outsourced processing

PostHog Inc. (United States): Analyzes app usage statistics (section 8).
Apple and Google (if you sign up for sync): Identity verification.

Google processes the information sent to it through Google sign-in under Google's own policies. Google Privacy Policy: https://policies.google.com/privacy

4. Your rights and account deletion

Turn off app usage statistics: Turn off Settings > Send usage statistics in the app. We stop sending them from that point. All features of the app keep working.
Uninstalling the app immediately deletes the data on your device.
If you created an account, you can delete it immediately under Settings > Delete account in the app. Your account and data on the server will be deleted.
If you cannot use the app, email todaycheck@hyunjins.co.kr with the email address you used to sign up and request deletion.

You can review and delete your data using the options described above, including account deletion and requests by email to todaycheck@hyunjins.co.kr.

5. Children under 14

Children under 14 cannot create an account.

6. Do Not Track

TodayCheck does not respond to Do Not Track (DNT) browser signals. We do not track you across other companies' apps or websites.

7. Changes to this policy

We post the updated policy in the app and at https://todaycheck.hyunjins.co.kr/legal/privacy_en.html and update the effective date. For important changes, we notify you in the app.

8. Data stored outside your country

We send and store personal information on servers in the Republic of Korea (South Korea). App usage statistics are sent to PostHog Inc. in the United States. If you live outside these countries, your information is transferred to them. You consent to this transfer when you agree to this policy and the Terms of Use. You agree when you start using the app and when you create an account.

Account data and sync data (if you sign up for sync): Stored on servers we operate ourselves (Oracle Cloud, Chuncheon region).
App usage statistics (United States): Sent to PostHog US Cloud (Amazon Web Services data centers), operated by PostHog Inc., 2261 Market Street #4008, San Francisco, CA 94114, USA. It is set up not to store the IP address used when sending.
Error information: Sent to servers in South Korea.
Google sign-in data: Sent to Google. Google processes it under Google's own policies (section 3).

Countries of transfer: Republic of Korea, and the United States (app usage statistics only).

Korean privacy law: Korea has the Personal Information Protection Act. The Personal Information Protection Commission (PIPC) supervises it. Japan's Personal Information Protection Commission publishes a report on the Korean system: https://www.ppc.go.jp/files/pdf/korea_report.pdf

How we protect your data:

We store account data and sync data on servers we operate ourselves.
Only we, the operator, can access data on the servers we manage.
App usage statistics are not linked to personally identifying information. PostHog is set up not to store IP addresses or infer locations from them. PostHog's privacy policy: https://posthog.com/privacy
Error information and app usage statistics do not include your email address, nickname, or content you enter in the app.
We keep error information for 90 days. App usage statistics are kept for the retention period of PostHog (1 year). We delete account data immediately when you delete your account.

9. Privacy officer

Hyunjins (Representative: Jang Hyunjin) · todaycheck@hyunjins.co.kr

Business address: 6F, 25 Hyangchon 1-gil, Gwacheon-si, Gyeonggi-do, Republic of Korea