Terms and Conditions

Easy Rechnung — mobile app for invoice creation

1. Scope

These Terms and Conditions govern the use of the Easy Rechnung app (the "app") for iOS and Android and all related services.

The app is provided by Nikolay Mantchev (the "provider" or "we").

2. Licence and rights of use

2.1 Grant of licence

The provider grants you a limited, non-transferable, non-exclusive licence to use the app on your mobile device, subject to these terms and applicable law.

2.2 Restrictions

• You may not reproduce, modify, decompose, decompile or reverse-engineer the app.
• You may not rent, lend or give away the app for commercial purposes without explicit written permission.
• You may not pass on or sublicense the app.
• You may not distribute malware, viruses or other harmful content via the app.

3. Subscription and payment

3.1 Subscription plans

The app offers the following subscription options:

• Free (30-day trial): all premium features for 30 days at no charge
• Premium (monthly): €4.89/month
• Premium (yearly): €29.99/year

After the 30-day free trial expires you must actively choose and confirm a subscription. There is no automatic billing.

3.2 Payment processing

Payments are processed via the payment systems of the respective app stores (Apple App Store, Google Play Store) or via Adapty. Charges are billed monthly or yearly (depending on the chosen plan) on the purchase date.

3.3 Cancellation

You can cancel your subscription at any time through your app store settings or your app store account settings. Cancellation takes effect at the end of the current billing period.

4. Liability and warranty

4.1 Disclaimer

The app is provided "as is" (AS-IS) without warranty or guarantee of any kind, either express or implied. The provider does not guarantee:

• Uninterrupted operation of the app
• Error-free or secure operation
• Correctness of invoice data or its conformity with non-European standards

4.2 Limitation of liability

The provider is not liable for:

• Data loss or corruption
• Lost profits or indirect damages
• Unauthorised access or third-party security breaches
• Errors during PDF or XRechnung generation (your responsibility as the invoice issuer)

4.3 User responsibility

As the invoice issuer you are fully responsible for the accuracy, lawfulness and storage of your invoice data under §14 UStG and the GDPR. The app is a tool — you decide its purpose and use.

5. Data protection and security

The processing of personal data is governed by our Privacy Policy and the GDPR. Please read it carefully.

You are responsible for securing your devices and your local data. The provider recommends:

• Performing regular backups
• Activating biometric authentication (fingerprint, Face ID)
• Keeping devices and the app up to date

6. Availability and maintenance

The provider strives to keep the app stable and secure. Planned maintenance and updates may cause downtime. The provider is not liable for unplanned downtime that lies outside its control.

Server PDFs: generated PDFs are stored encrypted on the server for at most 24 hours. You should download them after creation. The provider is not liable for the loss of PDFs after this period.

7. Compliance

The app generates invoices in accordance with:

• EN 16931 — EU standard for electronic invoices (CEN/TS 16931-3-3, in force since January 2026)
• ZUGFeRD 2.4 / Factur-X 1.08 — German/French hybrid format for electronic invoices (PDF/A-3b with embedded CII-XML)
• XRechnung 3.0.2 — standard format for public-sector contracting authorities in Germany (CIUS on EN 16931, KoSIT)

The generated invoices are XSD-validated and contain all mandatory fields (seller, buyer, line items, VAT breakdown, payment terms, SEPA).

Note: the provider does not guarantee compatibility with every ERP, accounting or government system. Statutory obligations regarding retention and accuracy (§14 UStG, §257 HGB) remain your responsibility.

8. Changes and termination

The provider reserves the right to change these terms at any time. Material changes will be communicated to you at least 14 days in advance. Continued use of the app implies acceptance of the changed terms.

Termination by the provider: the provider may terminate access to the app if you violate these terms, the app becomes technically unmaintainable, or security reasons require it.

9. External services

The app uses external services:

• Adapty (subscription management)
• Apple App Store & Google Play Store

The provider is not liable for downtime, data loss or errors of these services. Their use is governed by their respective terms.

10. Intellectual property

All app contents (code, design, documentation, icons) are the property of the provider or its licensors. You receive only a limited usage licence. Reproduction, modification or publication without permission is prohibited.

11. Applicable law and jurisdiction

These terms are governed by German law (Federal Republic of Germany). The place of jurisdiction is Frankfurt am Main, to the extent legally permissible. For consumers, statutory limitation periods and rights of withdrawal under BGB and GDPR apply.

12. Dispute resolution

In case of disagreements, queries are first handled in writing by email: 04vision04@protonmail.com

13. Contact