Terms of Service

Version 1.4-A | Effective: April 1, 2026

dit•DAHs is an educational tool for learning and practicing International Morse Code (CW). By using the App, you agree to the following terms. If you do not agree, do not use the App.

1. Educational Purpose

The App is for personal, non-commercial learning only. It does not replace official study materials or licensing requirements. We do not guarantee exam passage, proficiency certification, or any particular learning outcome.

2. Amateur Radio Licensing

Using the App does not grant any radio operating privileges. You must obtain the appropriate license from your national authority (e.g., the FCC in the United States) before transmitting on amateur radio frequencies.

3. Audio Safety

IMPORTANT: dit•DAHs produces audio tones for training purposes.

Start with LOW volume and adjust to a comfortable level
Use headphones at MODERATE volumes only
Take 10-minute breaks every hour
Stop immediately if you experience discomfort, ringing, or fatigue

High-volume audio can cause permanent hearing damage. We are not liable for hearing injury resulting from improper use.

If you have hearing conditions such as tinnitus, hearing loss, or use hearing aids, consult a healthcare professional before use.

4. User Profiles

You may create a local user profile (preferred name, callsign). Profiles are stored only on your device and are not transmitted to or stored on our servers. Clearing your browser or app data will permanently delete your profile and progress. We cannot recover lost local data.

See our Privacy Policy for complete details on how local data is handled and confirmation that no personal identifiers are collected or transmitted.

5. Children Under 13

dit•DAHs is not directed toward children under 13. Because we do not collect or transmit personal data, the App may be used by minors under adult supervision and with verifiable parental consent. By permitting a minor to use the App, a parent or guardian accepts these Terms on the minor's behalf.

For Scout troops and youth programs: Adult leaders must obtain parental consent and comply with applicable youth protection policies before introducing the App to participants.

6. Free and Paid Features

The App currently offers a free tier (Fundamentals and Advanced). A paid Instructor Edition is planned for a future release. Features and pricing may change over time with reasonable notice.

Subscriptions (If/When Available): Instructor Edition subscriptions (if introduced) will renew automatically unless canceled through the App Store or Google Play before the renewal date.

These provisions apply only if paid features are offered through those platforms. Payments made through Apple App Store or Google Play are subject to those platforms' billing terms, refund policies, and dispute resolution processes. We do not control or have access to these platform payment systems.

For subscription management, cancellations, or refunds, contact Apple or Google directly.

7. Reference Materials & Copyright

The CW Field Cards, reference charts, mnemonics, and educational content provided in dit•DAHs are for personal study and reference only within the App.

These materials are protected by copyright and may not be:

Reproduced, copied, or extracted from the App
Distributed or shared publicly in any form
Used for commercial purposes
Used to develop competing products or services

By using dit•DAHs, you agree to respect these restrictions.

8. Hardware Integration

dit•DAHs supports external paddles and keys via USB adapters (e.g., vBand). We are not responsible for compatibility issues, hardware defects, or damage caused by third-party hardware. Use of hardware accessories is at your own risk.

9. No Warranty

USE AT YOUR OWN RISK.

The App is provided on an “AS IS” and “AS AVAILABLE” basis without warranties of any kind, whether express or implied.

TO THE FULLEST EXTENT PERMITTED BY LAW, WE DISCLAIM ALL WARRANTIES INCLUDING:

Warranties of merchantability
Warranties of fitness for a particular purpose
Warranties of non-infringement
Warranties of accuracy, reliability, or availability
Warranties that the App will be uninterrupted, error-free, or secure

We do not guarantee:

That use of the App will result in passing any exam or achieving any particular skill level
Compatibility with all devices or browsers
Preservation of user data or settings
Continuous availability or specific performance levels

Any reliance on the App for training outcomes is at your sole risk.

10. Limitation of Liability

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, Line & Signal Design Co. LLC shall not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, including but not limited to:

Hearing injury or other physical harm from audio use
Exam failure or failure to obtain a radio license
Loss of progress, data, or settings
Loss of profits or revenue
Any harm arising from use of the App while operating radio equipment or in other situations requiring full attention

In no event shall our total cumulative liability to you for any claims arising under or relating to these Terms exceed the greater of (a) the amount you paid us in the twelve months preceding the claim, or (b) one hundred dollars ($100.00 USD). This limitation applies even if we have been advised of the possibility of such damages.

Some jurisdictions do not allow the exclusion or limitation of certain damages, so the above limitations may not apply to you in full.

Force Majeure: We are not liable for failure or delay in performance caused by events beyond our reasonable control, including:

Internet outages or network disruptions
Natural disasters, pandemics, or acts of war
Government actions or regulatory changes
Third-party service failures (hosting, analytics)

11. User Conduct

You agree not to:

Reverse engineer, decompile, disassemble, or attempt to extract source code or training methodologies from the App
Use the App for any unlawful purpose
Redistribute or resell the App or its content
Interfere with the App’s operation or security
Use the App or its outputs to develop competing products or services
Use the App while operating radio equipment or in any situation requiring your full attention

12. Indemnification

You agree to indemnify, defend, and hold harmless Line & Signal Design Co. LLC, its officers, directors, employees, and agents from and against any and all claims, damages, obligations, losses, liabilities, costs, or expenses (including reasonable attorneys’ fees) arising out of or resulting from:

Your use or misuse of the App
Your violation of these Terms
Your violation of any third-party rights, including intellectual property or privacy rights
Any unlawful activity conducted through your use of the App
Any false or misleading information you provide

We reserve the right to assume exclusive defense and control of any matter subject to indemnification by you, and you agree to cooperate with our defense of such claims. You may not settle any such claim without our prior written consent.

This indemnification obligation survives termination of these Terms.

13. Intellectual Property

dit•DAHs, the dit•DAHs logo, Practice Cadence™, and all intellectual property including software, source code, algorithms, audio content, training methodologies, user interface designs, documentation, and educational materials are owned by Line & Signal Design Co. LLC. All rights reserved.

License to use: Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to access and use the App for personal, non-commercial purposes only. This license does not include the right to sublicense, modify, or create derivative works.

Restrictions: You may not reverse engineer, decompile, disassemble, or attempt to extract source code, training algorithms, audio timing logic, or other proprietary components of the App. You may not use the App or its content to develop, train, or improve competing products or services.

AI and machine learning: No content, audio, training methodologies, or data from the App may be used to train, fine-tune, or improve machine learning models or artificial intelligence systems without express written permission from Line & Signal Design Co. LLC.

Unauthorized use, copying, modification, or distribution of any App content is prohibited and may result in legal action.

14. Changes to These Terms

We may update these Terms from time to time. If we make material changes, we will provide notice through the App, by email (if you have provided one), or by other reasonable means before changes become effective. Non-material changes (such as formatting, typo corrections, or clarifications that do not affect your rights) may be made without notice.

Continued use of the App after changes become effective constitutes your acceptance of the updated Terms. If you do not agree to the updated Terms, you must stop using the App.

15. Dispute Resolution & Arbitration

Arbitration Agreement:

You and Line & Signal Design Co. LLC agree that any dispute, claim, or controversy arising out of or relating to these Terms or the App will be resolved through binding individual arbitration, except that either party may bring claims in small claims court if they qualify. This agreement applies to all claims whether based on contract, tort, statute, or any other legal theory.

The arbitration will be administered by the American Arbitration Association (AAA) under its Consumer Arbitration Rules. Arbitration may be conducted remotely by video, telephone, or written submission, or in a mutually agreed location. You and we agree that the arbitrator shall have exclusive authority to resolve any dispute relating to the interpretation, applicability, or enforceability of this arbitration agreement, including whether it is unconscionable or voidable.

Class Action Waiver:

Except where prohibited by applicable law, you agree to bring claims against us only in your individual capacity and not as part of any class action, collective action, or representative proceeding. You waive the right to participate in class actions. The arbitrator may not consolidate more than one person’s claims and may not preside over any class or representative proceeding.

Opt-Out:

You may opt out of this arbitration agreement by sending written notice to legal@ditdahs.com within 30 days of first accepting these Terms. Your notice must include your name and a clear statement that you are opting out of arbitration. Opting out does not affect any other provision of these Terms.

Fees:

Payment of arbitration fees will be governed by the AAA’s Consumer Arbitration Rules. We will not seek to recover arbitration fees from you unless the arbitrator finds your claim was brought in bad faith.

Severability:

If any portion of this arbitration section is found to be unenforceable, the remaining portions will remain in full effect. If the class action waiver is found unenforceable with respect to any claim, that claim must proceed in court and not in arbitration.

Exception:

Nothing in this section prevents you from filing a complaint with the Federal Trade Commission, your state attorney general, or other regulatory agencies.

Governing Law:

These Terms are governed by the laws of the State of South Carolina, excluding its conflict of law principles.

16. Export Compliance

You agree to comply with all applicable export control laws and regulations, including the U.S. Export Administration Regulations.

You represent that you are not located in a country subject to U.S. embargo and are not on any U.S. government list of prohibited or restricted parties.

17. Severability & Entire Agreement

If any provision of these Terms is found to be invalid or unenforceable under applicable law, that provision will be modified to the minimum extent necessary to make it enforceable, and the remaining provisions will continue in full force and effect.

These Terms, together with our Privacy Policy, constitute the entire agreement between you and Line & Signal Design Co. LLC regarding your use of the App and supersede any prior agreements.

18. Accessibility

We are committed to making dit•DAHs accessible to users with disabilities. We aim to meet WCAG 2.2 Level AA guidelines and continue to improve accessibility as an ongoing effort. If you encounter accessibility barriers, please contact support@ditdahs.com and we will work to address your needs.

Users outside the United States are responsible for compliance with local laws governing app use, including any applicable data protection, consumer rights, or accessibility regulations in their jurisdiction.

19. App Store & Platform Distribution

If you download or access dit•DAHs through the Apple App Store or Google Play, the following applies:

Apple: These Terms are between you and Line & Signal Design Co. LLC only, not with Apple Inc. Apple is not responsible for the App or its content. Apple has no obligation to provide maintenance or support for the App. To the extent permitted by law, Apple has no warranty obligation for the App. Apple is not responsible for addressing any claims relating to the App, including product liability claims, consumer protection claims, or intellectual property infringement claims. You must comply with any applicable third-party terms when using the App. Apple and its subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance, Apple will have the right to enforce these Terms against you as a third-party beneficiary.

Google: These Terms are between you and Line & Signal Design Co. LLC only, not with Google LLC. Google is not responsible for the App or its content and has no obligation under these Terms.

20. Contact

Questions about these Terms?

General: support@ditdahs.com
Legal & Privacy: legal@ditdahs.com