AI-Powered Letter Interpreter
LetterAssist is a mobile application that uses artificial intelligence to help you understand official and bureaucratic letters. Simply scan or photograph any letter, and get an instant, structured interpretation — including summaries, required actions, deadlines, and payment information.
Photograph or import any official letter. OCR extracts text entirely on your device — your documents never leave your phone.
Advanced AI analyses your letter and provides a structured breakdown: summary, urgency level, required actions, and key dates.
Never miss an important deadline. LetterAssist automatically extracts dates and lets you set local reminders.
No personal data collected. No account required. Your original letter content is never stored on our servers.
Last updated: February 16, 2026
Please read these Terms & Conditions ("Terms") carefully before using the LetterAssist mobile application ("App") operated by ZDA Incorporation ("we", "us", "our").
By downloading, installing, or using the App, you agree to be bound by these Terms. If you do not agree to these Terms, do not use the App.
LetterAssist is a mobile application that uses artificial intelligence ("AI") to help users understand official and bureaucratic letters, primarily in German and other European languages. The App extracts text from documents using optical character recognition (OCR) and generates structured interpretations including summaries, required actions, deadlines, and payment information.
All interpretations provided by the App are generated by artificial intelligence and may contain errors, inaccuracies, or omissions. The AI may:
You must always verify all information against the original letter.
The App does NOT provide and is NOT a substitute for:
The interpretations are for informational purposes only. For important matters, always consult a qualified professional (lawyer, tax advisor, financial advisor, etc.).
LetterAssist is not affiliated with, endorsed by, or connected to any government agency, public authority, insurance company, bank, healthcare provider, or any other official institution. The App is an independent third-party tool.
We do not guarantee the accuracy, completeness, or reliability of any interpretation. We are not responsible for any actions you take or fail to take based on information provided by the App, including but not limited to:
The App uses anonymous authentication. No personal information (name, email, phone number) is required to use the App. A unique anonymous identifier is automatically generated for credit management purposes.
New users receive 3 free interpretation credits upon first use. Each credit allows one document interpretation.
Additional credits can be purchased through the App via in-app purchases:
| Package | Price |
|---|---|
| 10 credits | 4.99 EUR |
| 25 credits | 7.99 EUR |
Prices may vary by region and are subject to change. The applicable price is displayed at the time of purchase.
One credit is consumed per successful interpretation. Credits are deducted after the interpretation is completed. Credits are non-refundable and non-transferable.
All payments are processed through Apple's App Store via RevenueCat. By making a purchase, you also agree to Apple's App Store terms.
You can restore previously purchased credits on a new device or after reinstalling the App using the "Restore Purchases" feature in Settings.
You agree not to:
The App, including its design, code, prompts, and user interface, is the intellectual property of ZDA Incorporation. You are granted a limited, non-exclusive, non-transferable license to use the App for personal, non-commercial purposes.
Interpretations generated by the App are provided for your personal use. The original letters you scan remain your property — we do not claim any rights over your documents.
The original letter text is not stored by the App or on our servers. It is transmitted to our server solely for the purpose of generating an interpretation and is not retained after processing.
The App can set local reminders for deadlines extracted from letters. These reminders are:
Reminder accuracy depends on the accuracy of the AI interpretation. Always verify deadlines against the original letter.
We strive to keep the App available at all times, but we do not guarantee uninterrupted service. The App may be temporarily unavailable due to:
An offline mode using on-device AI may be available on supported devices (requires iOS 26 or later with Apple Intelligence), but may provide lower-quality results.
To the maximum extent permitted by applicable law:
You agree to indemnify and hold harmless ZDA Incorporation from any claims, damages, losses, or expenses (including legal fees) arising from your use of the App or violation of these Terms.
We reserve the right to modify these Terms at any time. Changes will be effective when posted in the App or on our website. Continued use of the App after changes constitutes acceptance of the modified Terms.
We will notify users of material changes through the App.
We may suspend or terminate your access to the App at any time, without notice, for conduct that we determine violates these Terms or is harmful to other users or our services.
Upon termination, your license to use the App is revoked. Unused credits are non-refundable upon termination.
These Terms are governed by and construed in accordance with the laws of Germany, without regard to conflict of law principles. Any disputes shall be resolved in the courts of Germany.
If any provision of these Terms is found to be unenforceable, the remaining provisions shall continue in full force and effect.
If you have questions about these Terms, please contact us at:
ZDA Incorporation
By using LetterAssist, you acknowledge that you have read, understood, and agree to these Terms & Conditions.
Last updated: February 16, 2026
This Privacy Policy describes how ZDA Incorporation ("we", "us", "our") collects, uses, and protects your information when you use the LetterAssist mobile application ("App").
We are committed to protecting your privacy. LetterAssist is designed with privacy in mind — we collect the minimum data necessary to provide the service, and we never store the original content of your letters.
| Data | Purpose | Storage |
|---|---|---|
| Anonymous User ID | Identify your account for credit management | Firebase servers |
| Credit balance | Track available and used interpretation credits | Firebase servers |
| Usage statistics | Total interpretations used, last scan date | Firebase servers |
| Analytics events | Improve app quality and user experience | Firebase Analytics |
We do NOT collect: your name, email address, phone number, physical address, location data, contacts, or any other personally identifiable information (PII).
| Data | Purpose | Storage |
|---|---|---|
| Document images/PDFs | Extract text for interpretation | Processed on-device only; never stored |
| Extracted letter text | Generate AI interpretation | Sent to server for processing; not retained |
| Interpretation results | Display and save results for your reference | Stored locally on your device only |
| Reminders | Notify you of upcoming deadlines | Stored locally on your device only |
| App preferences | Personalize your experience | Stored locally on your device only |
We use the collected information solely to:
We do NOT use your information for: advertising or marketing, selling to third parties, user profiling or behavioral targeting, or training AI models with your document content.
Understanding exactly what happens to your data:
We use the following third-party services to operate the App:
| Data | Retention Period |
|---|---|
| Anonymous user ID & credits | Retained on server until account deletion is requested |
| Interpretation results | Stored on your device until you delete them |
| Reminders | Stored on your device until you delete them |
| Analytics data | Retained per Firebase Analytics defaults (14 months) |
| Original letter text | Not retained — processed in transit only |
You can delete saved interpretations at any time by swiping to delete in the History tab. Deleting an interpretation also removes all associated reminders.
You can delete individual reminders in the Reminders tab.
You can revoke camera, photo library, notification, and calendar permissions at any time through iOS Settings.
Uninstalling the App removes all locally stored data (interpretations, reminders, preferences).
To request deletion of your server-side data (anonymous user ID and credit information), contact us at aliafzalch@zdaincorporation.com. We will process your request within 30 days.
If you are located in the European Economic Area (EEA), you have the following rights under the General Data Protection Regulation (GDPR):
To exercise any of these rights, contact us at aliafzalch@zdaincorporation.com.
Legal basis for processing:
The App is not directed to children under the age of 16. We do not knowingly collect information from children. If you believe a child has used the App, please contact us and we will take steps to delete any associated data.
Your data may be processed in countries outside your country of residence, including:
We ensure that any international transfers comply with applicable data protection laws, including the use of Standard Contractual Clauses where required.
We may update this Privacy Policy from time to time. Changes will be posted in the App and on our website with an updated "Last updated" date. Material changes will be communicated through the App.
Your continued use of the App after changes constitutes acceptance of the updated Privacy Policy.
If you have questions or concerns about this Privacy Policy or our data practices, please contact us at:
ZDA Incorporation
For GDPR-related inquiries, you may also contact your local data protection authority.
By using LetterAssist, you acknowledge that you have read and understood this Privacy Policy.