Terms of Use

These terms cover your use of GutC, provided by Hédéonix, represented by Yeonsun Shin. GutC is available for iPhone and iPad, with optional Apple Watch features. Check the App Store for supported devices and operating systems.

The Privacy Policy explains how personal information is handled. Any required consent for that processing is obtained separately from these terms.

Minors who need parental or guardian consent under applicable law must obtain it to use the service. Contracts entered into without required consent may be cancelled under applicable law.

GutC is a personal health diary for reviewing changes in your body alongside related factors during weight loss. Keep weight and body measurements, meals, fluid intake, how you feel, and medication schedules, entries and costs in one place, and see trends in information you enter or authorize the app to access. GutC does not guarantee a particular weight-loss result or the accuracy of estimated dates.

You can record period start and end dates and how you feel, and see an estimated next start date based on your entries or chosen cycle length. The actual date may differ. Estimates must not be used for contraception or to determine pregnancy.

Medication reminders are alarms for the schedule you set. When the time zone changes, such as during overseas travel, the app adjusts reminder times according to your device’s time zone and chosen travel settings. It does not assess whether the interval between doses is medically appropriate. Check the adjusted reminder times.

GutC is not a medical device. It does not diagnose, prevent or treat disease, or determine or recommend medication doses or methods of use. Entries, charts, estimates and reminders do not replace medical care or judgment. Discuss health and medication decisions with a healthcare professional.

You are responsible for checking the dates, units and details you enter. Medication names, doses and schedules are your own records, not prescriptions or recommendations from the app. Apple Health information is displayed or saved only within the permissions you grant.

Reminders and Watch record transfers can be affected by permissions, connectivity, the operating system and time-zone settings.

GutC does not detect emergencies or monitor health in real time.

The app is free to download. The one-month free trial costs nothing and starts when you confirm your subscription on Apple's purchase screen in the app. It is available once per Apple Account used for App Store purchases, subject to Apple’s eligibility check.

If you have not cancelled and have given any required consent, the first annual subscription fee is charged when the free trial ends. For example, if you start the trial on February 5, your first scheduled billing date is March 5. If the next month has no matching date, the last day of that month applies (February 28, or February 29 in a leap year).

Trial conversion depends on the country or region of the Apple Account used for purchases. In the United States, the trial converts to a paid subscription automatically unless cancelled. In the Republic of Korea, it converts only after you give additional consent through Apple. In other countries or regions, follow the conditions shown by the relevant App Store. If no free offer applies, you are charged at purchase.

After the trial, the paid subscription renews annually. Renewal charges may be processed within the 24 hours before each paid subscription renewal. Check Apple’s purchase screen or subscription settings for the trial end date, scheduled billing date and price. To avoid the next payment, cancel in Apple’s subscription settings at least 24 hours before the trial ends or the subscription renews. Deleting the app does not cancel your subscription.

After changing devices or reinstalling the app, use the Apple Account used for the App Store purchase to verify your active subscription and access its remaining period. Restoring purchases checks your existing access; it does not make a new purchase or extend the subscription. If an active subscription is not recognized, contact support before paying again.

Your access is based on the subscription status and end date verified by Apple. GutC cannot combine or transfer purchases between different Apple Accounts. This differs from changing the email address on the same account.

Restoring purchases does not bring back your diary. Recovering records after changing devices or reinstalling requires a full backup or CSV file saved beforehand. See section 8 for backup guidance. iPhone and iPad records do not automatically sync or merge.

Go to Settings → Subscription & Offers → Redeem Offer Code, enter the code and check Apple’s confirmation that it has been redeemed. Check the information supplied with the code for eligibility and its redemption deadline, and Apple’s screen for the free or discounted offer and any later payment terms. If you have a subscription or free trial, the offer may begin after your current access period ends.

After your subscription ends, you can still view, back up, export as CSV and delete saved records. Features requiring a subscription, such as adding entries, may be restricted. Temporary subscription verification issues do not delete records. The storage and deletion rules in section 8 still apply.

A CSV file (.csv) contains a table of text and numbers from your records at the time of export. You can open it in Excel or Numbers to organize the data or create charts. Save one from Settings → Records & Backup → Export as CSV. Editing the CSV does not change your records in GutC.

You retain rights to the records you create. These terms do not give the operator permission to use them for advertising or AI training.

To the extent protected by law, rights in the app’s software, design, characters, logos, guidance, the wording of these terms, and screens and content expressing its concepts belong to their respective rights holders, including Hédéonix and Yeonsun Shin. Third-party materials remain the property of their respective rights holders.

You may use the app for personal purposes to manage your own records. You may not resell or redistribute the app or its protected content without separate permission. This restriction does not cover the use of your own records or uses permitted by law.

Without prior permission from the rights holder, you may not reverse engineer, decompile or disassemble the app’s software, or copy, adapt or distribute its protected materials to create other apps or services. This also applies to supplying those protected app materials to AI or automated tools to create imitations or train models. Describing a work as an homage or as based on reference material does not replace any required permission.

You may export and use your own records, and share screenshots for reviews or support. Hide other people’s personal information. Quotation, research and interoperability analysis permitted by law remain allowed within the relevant conditions and scope. This clause does not restrict general ideas or functionality, or statutory consumer rights.

Do not access, collect or share others’ information without legitimate authorization, disrupt the service with malicious code or deliberately excessive requests, or falsify payment or subscription information or defeat security to gain improper access or use rights.

Apple Media Services Terms and Conditions also apply to App Store downloads, payments, cancellations and refunds. The end-user license agreement (EULA) shown in the App Store applies to the app license.

The operator makes reasonable efforts to provide a reliable service and resolve errors. If use is interrupted, we explain the confirmed cause and available steps.

The operator may change features to improve, secure or operate the service. Where possible, we give advance notice of material changes affecting paid use or service closure, with an opportunity to export records and guidance on remaining paid time. Urgent security measures may be explained afterwards.

The operator is not responsible for losses or service limitations caused by entry errors, lost backup files or passwords, network outages, device failures or third-party service outages where the operator is not at fault.

The operator’s liability follows applicable law. These terms do not exclude legal liability for intentional misconduct, gross negligence or personal injury, or rights guaranteed to consumers.

If you have a problem using the app, contact info@hedeonix.com. We check the circumstances and guide you through appropriate steps, such as recovery steps, app fixes or contacting Apple.

If an app problem prevents you from using the service, we address the affected period in line with applicable law and the confirmed circumstances. Beyond measures required by law, additional assistance, such as official Apple offer codes or access-period adjustments, may be provided depending on the circumstances. Providing it does not, by itself, mean that all claims are accepted or that the same assistance is promised in other cases.

Cancelling a subscription and requesting a refund for an amount already paid are separate procedures. Request an App Store payment refund through Apple’s process; Apple provides the decision and processing timeline. The operator helps with necessary checks and guidance. Independently of that process, statutory rights to withdraw from a contract, obtain a refund or seek damages remain available. Receiving or using an offer code does not, by itself, mean you have settled a dispute or waived legal rights.

These terms are, in principle, interpreted and applied under the laws of the Republic of Korea. Mandatory legal provisions that cannot be excluded by agreement in the country or region where you habitually live take precedence.

If a dispute arises, you and Hédéonix may agree separately in writing to arbitration administered by the Korean Commercial Arbitration Board in Korean. Without a valid arbitration agreement, the Seoul Central District Court has jurisdiction to the extent permitted by law.

The applicable law and dispute procedures for transactions with Apple and the app license follow the relevant agreements and law.

We announce changes, their reasons and the effective date in the app or on the website in advance. For important or unfavorable changes, we allow sufficient time for review and obtain any separate consent required by law. Continued use does not replace required separate consent.

Contact: Hédéonix, represented by Yeonsun Shin · info@hedeonix.com

Korean is the original language of these Terms. The English version provided by Hédéonix is an official translation. If the two language versions of the same revision differ in meaning, the Korean version takes precedence in interpretation.

Responses in Korean or English issued by Hédéonix, including developer responses to App Store reviews and customer support emails, are official responses. If translations of the same response differ in meaning, the Korean original provided to the user takes precedence. If no Korean original was provided, the official English response is the reference.

Translations into other languages are provided to help you understand the content; the Korean original and official English version take precedence. This does not apply where Hédéonix expressly designates another version as official or the law requires otherwise. Automatic translations by an app store or browser, and translations by third parties, are not official responses from Hédéonix.

These language rules apply to the extent permitted by law. They do not replace required payment or privacy disclosures or consent, or limit rights that cannot legally be excluded. If you notice a translation error or a difference in meaning, contact info@hedeonix.com. We will review it and make any necessary corrections.