Hello. These are the Terms of Service for the Metronome app (hereinafter the "Service"). We have written them in plain language that anyone can understand, rather than difficult legal terms. Please read them once before signing up.
Effective date: 2026-05-04 · Version: v3
1About the Service
Metronome is a digital metronome app for music practice. The basic metronome features are free for everyone, and advanced features such as polyrhythm and metric modulation are available during your Premium period.
2Eligibility and Sign-up
You can use the Service in the following two ways.
Type
How to join
Eligibility
Member
Sign in with Apple ID or Google account + enter nickname/birth year
13 years or older
Guest
Use immediately after installing the app, with no sign-up
Any age (including children)
We do not register passwords.
The Service supports only Apple Sign-In / Google Sign-In, and password management is handled directly by Apple/Google. We never receive any password.
13+ membership eligibility (COPPA / GDPR-K compliance)
In accordance with the U.S. COPPA (Children's Online Privacy Protection Act) and the EU GDPR-K, children under 13 cannot register as members.
Children under 13 may use the app anonymously in guest mode, based on a device UUID.
3Member vs. Guest Benefits
Type
Premium period
Ad / coupon rewards
Marketing push
Guest (incl. children)
3 days granted automatically at first launch
Can watch ads (based on device UUID)
Not sent
Member (13+)
30 days granted automatically on sign-up
Available
Sent only with opt-in consent
Guests can also extend their Premium period indefinitely by watching ads (5 ads = 1 day extension, within a daily safety limit).
4Member Obligations
You must sign up with an Apple ID / Google account that belongs to you.
You must not misuse someone else's account or use the Service with automated tools.
You must not obtain benefits by fraudulent means in ad-watch rewards, coupon use, and the like.
You may not copy, transmit, or distribute part or all of the Service without the Company's prior consent.
When choosing a nickname, you must not defame others, use obscene/hateful expressions, or impersonate others.
5User Content and Community Code of Conduct
The Service provides community features where members can write posts and comments, search for and add friends, and share posts. The following code of conduct applies to all content that a member creates, posts, or transmits (hereinafter "User Content").
Responsibility for User Content lies with its author.
The Company does not review all User Content in advance, and responsibility for any issues arising from a post lies with the user who created it.
Prohibited content (content code of conduct)
Users must not create, post, or transmit content that falls under any of the following.
Content that insults or causes emotional distress to others, such as profanity, slander, harassment, or threats
Content harmful to minors, such as obscene, sexually suggestive, or violent material
Expressions that promote discrimination or hatred, or that demean a particular group
Content that promotes illegal acts or contains illegal information (illegal transactions, gambling, drugs, etc.)
Content that infringes others' rights such as copyright, likeness rights, or personal information, or that invades privacy
Content that impersonates others or spreads false information
Spam, flooding, indiscriminate advertising/promotion, or mass posting using automated tools
Any other content that violates applicable laws or these Terms
Reporting and handling
If you find content or a user that violates the code of conduct, you can report it through the Report feature in the app/web, and you can block an inappropriate user so that you no longer receive that user's posts or friend requests.
The Company reviews and acts on reports it receives; clear violations may be hidden (blinded) first.
The Company reviews the truthfulness and severity of the report and takes action within a reasonable scope.
We comply with the User-Generated Content (UGC) policies of the Apple App Store / Google Play.
We provide means to filter, report, and block inappropriate content, and we strive to act on violating content and users within 24 hours.
Sanctions for violations
If the code of conduct is violated, the Company may take the following actions without prior notice.
Hiding (blinding) or deleting the relevant content
Restricting use of community features (writing posts/comments, adding friends, etc.)
Suspending the Service or revoking membership in cases of serious or repeated violations
The Company may post and display User Content to the extent necessary for operating and promoting the Service, and may delete such content where required by law or where a violation of the code of conduct is confirmed.
6Payment and Refunds
You can extend your Premium period through the following three routes.
Route
Description
Limits
Watching ads
Watch the designated number of ads to get a +1 day extension
Available to both members and guests, subject to a daily safety limit
In-app purchase
One-time purchase products of 1 month / 3 months / 6 months / 1 year
One-time purchase, not a subscription; no auto-renewal
Coupon / event
+N days when you enter an issued code or tap an event push
One use per person; subject to issuance/event conditions
Payments are processed through the Apple App Store / Google Play, and refund policies follow each store's policy.
This is not a subscription product. In-app purchases in this Service are one-time purchases and do not auto-renew. If you wish to continue after expiration, you can purchase again or extend via ads/coupons.
7Account Deletion
You can delete your account at any time via the "Delete Account" menu on the Settings screen. Upon deletion:
Your member information is deleted immediately, and all authentication tokens are revoked.
Automatic login on other devices is also blocked immediately.
Purchased Premium is not retained (store-policy refunds are separate).
You can sign up again with the same Apple/Google account.
8Changes to and Suspension of the Service
The Company may change or discontinue part or all of the Service for reasons such as service improvement or changes to operating policy. In the event of significant changes, we will give notice at least 7 days before the effective date via in-app notice or push notification.
9Rewarded Ads
Members and guests can watch rewarded ads to extend their Premium period. Ads are delivered through Google AdMob, and the following policies apply.
Only G-rated ads are delivered (safe for all ages — Mixed Audience policy)
The tagForUnderAgeOfConsent option is applied (child protection)
Server-Side Verification: rewards are granted after AdMob's ECDSA signature verification (prevents tampering)
Only non-personalized ads are delivered
If you obtain ad rewards by fraudulent means, your membership may be restricted.
10Push Notifications and Marketing Consent
The Service sends two types of push notifications.
OS permission only (no separate marketing consent needed)
Marketing push
New feature launches, event coupons, discount notices
Members only, sent after explicit opt-in consent
Marketing push consent is OFF by default at sign-up.
Under Korea's Network Act, marketing push is sent only if a member explicitly consents.
You can withdraw consent at any time via the "Push Notifications" menu on the Settings screen.
Marketing push is not sent to guests (including children).
11Disclaimer
The Company is not responsible for service interruptions caused by reasons beyond its control, such as natural disasters, communication failures, or store-policy changes.
Damages arising from a user's careless management of their Apple ID / Google account password are the user's own responsibility.
In-app purchase refunds follow each store's policy; partial refunds (e.g., pro-rated by remaining days) are not provided.
12Dispute Resolution
Disputes related to use of the Service shall first be resolved through consultation; if no agreement is reached, the laws of the Republic of Korea shall apply and the Seoul Central District Court shall be the court of first instance.
13Changes to These Terms
These Terms may be amended in accordance with changes in law or the Service. In the event of significant changes, we will give notice from 7 days before the effective date via in-app notice or push notification, and obtain mandatory consent via a modal at first launch. If you do not agree to the amended Terms, you may stop using the Service by deleting your account.
14Contact
Contact person
Ahn Byeong-uk
Email
ahnsapp@gmail.com
For inquiries and reports, please contact us at the email above. We respond within 7 business days.