Dengram Terms of Service
Last updated: June 30, 2026 | Effective date: June 30, 2026
These Terms of Service ("Terms") apply to your use of Dengram ("the App" or "the Service"). These Terms form a legally binding agreement between the solo developer kukuDev ("the Operator") and you ("the User" or "you"). By using the Service, you acknowledge that you have read, understood, and agree to these Terms. If you do not agree to these Terms, do not access or use the Service.
1. Service Overview
Dengram is a Markdown (.md)-based knowledge-management reading-notes app that you use without sign-up or login, with core data such as your notes stored on your device. The Service provides the following features.
- Zettelkasten notes: Record in stages using fleeting notes for passing thoughts, literature notes to organize a book's key points, and permanent notes to keep your own conclusions.
- Note linking: Connect notes, books, and authors with outgoing links and backlinks, and view the connections at a glance in a concept map.
- Adding books: Add the books you read by searching the title or scanning the ISBN barcode.
- Sentence capture (OCR): Capture sentences with your camera to bring them into notes; text recognition is processed on your device.
- Markdown storage: All notes are stored as Markdown (.md) files on your device and can be opened in other Markdown apps.
- Reading overview: Check your reading with progress, a reading calendar, and statistics.
- Backup and restore: Back up and restore your book, author, and note data with Google Drive.
The Service is provided free of charge, may display banner ads, and offers an in-app purchase to remove ads.
2. Acceptance and Age
2.1. By using the Service, you acknowledge that you agree to these Terms and the Privacy Policy. The App is not intended for children under the age of 14. By using the Service, you represent and warrant that you have the legal capacity to enter into these Terms.
2.2. If a minor uses the Service, consent from a legal guardian may be required for certain features such as payment (see section 8). If you use the Service on behalf of a legal entity, you represent and warrant that you have the authority to bind that entity to these Terms.
3. Accounts and User Data
3.1. No accounts: The App has no sign-up or login and does not create a separate account.
3.2. Responsibility for your data: Rights to content you create, such as notes and reading records, belong to you. The Operator does not own it or transmit or view it externally (see the Privacy Policy). Because content is stored on your device, it may be lost if the device is lost, reset, or the App is uninstalled. You are responsible for keeping your important data yourself, for example through Google Drive backup.
3.3. Backup data: If you use Google Drive backup, that data is stored in your own account and managed by you.
4. In-App Purchase (Ad Removal)
4.1. The App offers a non-consumable in-app product (product ID: remove_ads) for removing ads. A single purchase applies permanently and can be restored from the same Google account. The price follows the amount shown in the Google Play Store.
4.2. Payment is made through Google Play, and the Operator server verifies the purchase token to grant the entitlement (receipt verification). The purchase entitlement is tied to your Google account (device) and is independent of any separate App account.
5. Use of the Service
5.1. Permitted use: The Operator grants you a non-exclusive right to use the App personally and non-commercially in accordance with these Terms. You must use the Service in compliance with all applicable laws and regulations.
5.2. Prohibited conduct: You must not do any of the following, and your use of the Service may be restricted if you do.
- Reverse-engineer, decompile, or extract the source of the App (except as permitted by law)
- Make abnormal calls to servers/APIs, abuse automation, bypass rate limits, or circumvent security
- Use the App for illegal purposes or to infringe others' rights
5.3. Advertising: The Service may display banner ads (it does not use interstitial, rewarded, or app-open ads). You acknowledge and agree that such ads are part of providing the Service for free.
6. Text Recognition (OCR) and Book Information
6.1. Text recognition (OCR) processes images you capture or select on the device and does not guarantee the accuracy of the results.
6.2. Book information (title, author, cover, etc.) is provided by external book-information providers and may not be accurate or up to date.
7. Third-Party Services and Content
7.1. The Service may integrate with services and features provided by third parties, such as Google Play, Google AdMob, Google Firebase, Google Drive, and external book-information search APIs. When you use such third-party services, you are subject to their terms and privacy policies. The Operator is not responsible for third-party services.
7.2. The Service may contain links to other websites or services. The Operator has no control over, and assumes no responsibility for, the content or practices of such third parties.
8. Withdrawal, Refunds, and Payments by Minors
8.1. Payment cancellation and refunds follow, in principle, Google Play's refund policy and procedures.
8.2. Withdrawal for digital content: Ad removal is a digital benefit that takes effect immediately upon purchase, so the right of withdrawal may be limited within the scope set by applicable law. This is disclosed in advance through these Terms before purchase. However, refund and withdrawal rights guaranteed by law are not limited.
8.3. Payments by minors: If a minor makes a payment without a legal guardian's consent, the person or their legal guardian may request cancellation under applicable law. Cancellation requests can be submitted via the contact email.
9. Privacy Policy
For information on how your personal data is collected, used, and disclosed, please refer to the Privacy Policy. By using the Service, you consent to the processing of your information in accordance with the Privacy Policy.
10. Disclaimer of Warranties
The Service is provided "as is" and "as available." The Operator makes no warranties of any kind, whether express or implied, including that the Service will be uninterrupted, error-free, free of data loss, or fit for a particular purpose. You are responsible for backing up your important data yourself.
11. Limitation of Liability
To the maximum extent permitted by applicable law, the Operator shall not be liable for any indirect, incidental, special, or consequential damages arising from the use or inability to use the Service. The Operator's total liability shall not exceed the amount you paid to use the Service. However, liability for damages caused by the Operator's willful misconduct or gross negligence, and liability that cannot be excluded under consumer-protection laws, is not limited.
12. Indemnification
You agree to indemnify and hold harmless the Operator (kukuDev) from any claims, losses, damages, liabilities, and costs (including reasonable attorneys' fees) arising from your use of the Service, your breach of these Terms, or your infringement of the rights of a third party.
13. Changes to the Terms
The Operator may modify or replace these Terms. For material changes, the Operator will give notice at least 30 days before the new Terms take effect, through an in-app notice or other reasonable means. If you do not agree to the changed Terms, you may stop using the Service and uninstall the App.
14. Termination of the Service
The Operator may restrict or suspend your use of the Service for reasonable cause, including a breach of these Terms. When you uninstall the App, the data on the device is deleted with it (except Google Drive backup data).
15. Governing Law and Dispute Resolution
These Terms are governed by and construed in accordance with the laws of the Republic of Korea. Disputes are first resolved through consultation between the Operator and the user; users in Korea may seek help from the Korea Consumer Agency (www.kca.go.kr) and the Content Dispute Resolution Committee (www.kcdrc.kr). Where litigation is necessary, jurisdiction follows the applicable civil procedure law and does not impose an exclusive jurisdiction unfavorable to consumers.
16. Miscellaneous
16.1. Severability: If any provision of these Terms is held invalid or unenforceable, that provision shall be limited or removed to the minimum extent necessary, and the remaining provisions shall remain in full effect.
16.2. Assignment: You may not assign your rights or obligations under these Terms without the Operator's prior written consent. The Operator may transfer its rights or obligations under these Terms in connection with a business transfer or similar event.
16.3. Entire agreement: These Terms constitute the entire agreement between you and the Operator regarding the Service and supersede all prior oral or written communications.
17. Contact
If you have questions about these Terms, please contact us at: