Terms of Service

Last updated: February 24, 2026

1. Description of the Service

Carlo Flashcards is a mobile application for learning with flashcards. The App uses a spaced repetition algorithm (FSRS) to schedule reviews at optimal intervals. Key features include:

• Creating, editing, and organizing flashcard decks
• Spaced repetition-based review sessions
• Cross-device sync via a user account
• Importing flashcard decks from other formats (e.g., Anki)
• Sharing decks with other users

2. Account Registration

To use certain features of the App (such as cross-device sync and deck sharing), you must create an account.

• You must provide a valid email address and create a password.
• You are responsible for maintaining the confidentiality of your login credentials.
• You are responsible for all activities that occur under your account.
• You must notify me promptly at carloflashcards@gmail.com if you suspect any unauthorized use of your account.
• You may use the App without an account for local-only flashcard learning, but sync and sharing features will not be available.

3. Your Content

"Your Content" refers to all flashcard text, deck names, descriptions, and any other material you create or import into the App.

• Ownership: You retain full ownership of Your Content. I do not claim any intellectual property rights over the flashcards or decks you create.
• License to operate: By using the App, you grant me a limited, non-exclusive license to store, process, and transmit Your Content solely for the purpose of providing the Service (e.g., syncing your data across devices, enabling deck sharing).
• Responsibility: You are solely responsible for Your Content. You must not create content that infringes on the intellectual property rights of others, is unlawful, or violates these Terms.
• Deletion: When you delete content or your account, Your Content is permanently removed from my servers, subject to reasonable technical delays.

4. Deck Sharing

The App allows you to share flashcard decks with other users.

• When you share a deck, other users can view and learn from the flashcard content in that deck.
• You are responsible for ensuring you have the right to share the content in your decks.
• Do not share content that is illegal, harmful, hateful, or that infringes on the rights of others.
• I reserve the right to remove shared decks that violate these Terms.

5. Acceptable Use

You agree not to use the App to:

• Violate any applicable laws or regulations
• Infringe on the intellectual property or other rights of any third party
• Upload or share content that is illegal, harmful, threatening, abusive, harassing, defamatory, obscene, or otherwise objectionable
• Attempt to gain unauthorized access to the App, its servers, or any related systems
• Interfere with or disrupt the integrity or performance of the App
• Reverse engineer, decompile, or disassemble the App, except where permitted by applicable law
• Use the App for any commercial purpose without my prior written consent (e.g., reselling access or bulk-exporting content for redistribution)
• Create multiple accounts to circumvent restrictions or abuse free tier limits

6. Subscriptions and Payments

The App may offer free and paid subscription tiers.

• Payment processing: All payments are handled through Apple's App Store or Google Play. I do not collect or store your payment information directly.
• Subscription terms: Subscription billing, renewal, and cancellation are governed by the terms of the respective app store through which you subscribed.
• Refunds: Refund requests must be directed to Apple or Google, as they process all payments. I do not have the ability to issue refunds directly.
• Free features: Core flashcard creation and local learning features are available without a paid subscription.

7. Intellectual Property

The App itself — including its design, code, graphics, logos, and user interface — is my intellectual property and is protected by applicable copyright and trademark laws.

• You may not copy, modify, distribute, or create derivative works based on the App.
• The spaced repetition algorithm (FSRS) used in the App is open-source software used under its respective license.
• Third-party open-source libraries used in the App retain their respective licenses.

8. Availability and Updates

• I strive to keep the App available, but I do not guarantee uninterrupted or error-free operation.
• The App may be temporarily unavailable for maintenance, updates, or reasons beyond my control.
• I may release updates that change, add, or remove features. Continued use of the App after an update constitutes acceptance of those changes.
• I reserve the right to discontinue the App at any time. If I permanently discontinue the Service, I will make reasonable efforts to notify you in advance so you can export your data.

9. Disclaimer of Warranties

10. Limitation of Liability

11. Account Termination

By you

You may delete your account at any time through the App's settings. Upon deletion, all your data will be permanently removed from my servers.

By me

I may suspend or terminate your account if:

• You violate these Terms
• Your use of the App poses a security risk or negatively impacts other users
• Required by law

Where possible, I will notify you before or promptly after taking such action, unless doing so would compromise security or violate legal obligations.

12. Changes to These Terms

I may update these Terms from time to time. The updated version will be indicated by a revised "Last updated" date at the top. If I make material changes, I will notify you through the App or by other appropriate means.

Continued use of the App after changes take effect constitutes acceptance of the revised Terms. If you do not agree with the changes, you should stop using the App and delete your account.

13. Governing Law and Dispute Resolution

These Terms are governed by and construed in accordance with the laws of the Federal Republic of Germany, without regard to its conflict of law provisions.

If you are a consumer residing in the European Union, you also benefit from any mandatory provisions of the consumer protection law of your country of residence.

Online Dispute Resolution: The European Commission provides an Online Dispute Resolution platform at https://ec.europa.eu/consumers/odr. I am not obligated and not willing to participate in dispute resolution proceedings before a consumer arbitration board.

14. Severability

If any provision of these Terms is found to be invalid or unenforceable, that provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions will remain in full force and effect.

15. Contact

If you have any questions about these Terms, you may contact me at: